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# IEEE Magnetics Letters

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• ### Dependence of Voltage and Size on Write Error Rates in Spin-Transfer Torque Magnetic Random-Access Memory

Publication Year: 2016, Article Sequence Number: 3102604
Cited by:  Papers (6)
| | PDF (948 KB) | HTML

The dependence of the write-error rate (WER) on the applied write voltage, write pulse width, and device size was examined in individual devices of a spin-transfer torque (STT) magnetic random-access memory (MRAM) 4 kbit chip. We present 10 ns switching data at the 10-6 error level for 655 devices, ranging in diameter from 50 nm to 11 nm, to make a statistically significant demonstratio... View full abstract»

• ### A Three-Dimensional Magneto-Electric Vibration Energy Harvester Based on Magnetic Levitation

Publication Year: 2017, Article Sequence Number: 6104703
| | PDF (274 KB) | HTML

A three-dimensional vibration energy harvester employing a magneto-electric (ME) transducer was developed for wireless sensor networks. It uses a magnetic levitation unit to convert ambient vibration in arbitrary directions into the motion of a central suspended magnet. The ME transducer generates output power in response to magnetic field variations. Experiments verify the feasibility of the devi... View full abstract»

• ### Interfacial Perpendicular Magnetic Anisotropy in Sub-20 nm Tunnel Junctions for Large-Capacity Spin-Transfer Torque Magnetic Random-Access Memory

Publication Year: 2017, Article Sequence Number: 3105805
| | PDF (405 KB) | HTML

Magnetic tunnel junctions (MTJs) with interfacial perpendicular magnetic anisotropy (PMA) attract much attention due to their utilization in spin-transfer torque magnetic random-access memory (STT-MRAM). Large interfacial PMA provides high thermal stability, which is critical for large-capacity MTJ arrays. We investigate the thermal stability and interfacial PMA needed for STT-MRAM applications. A... View full abstract»

• ### Comparison of Synthetic Antiferromagnets and Hard Ferromagnets as Reference Layer in Magnetic Tunnel Junctions With Perpendicular Magnetic Anisotropy

Publication Year: 2010, Article Sequence Number: 3000204
Cited by:  Papers (28)  |  Patents (8)
| | PDF (301 KB) | HTML

In magnetic tunnel junctions (MTJ), synthetic antiferromagnets (SAF) are usually used as reference layer to minimize dipolar interactions induced between this layer and the free layer (FL). We show here that the use of SAF allows us to reduce the asymmetry of the FL reversal due to stray fields in nanosized MTJs with perpendicular magnetic anisotropy. View full abstract»

• ### Buffered Spin-Torque Sensors for Minimizing Delay and Energy Consumption in Global Interconnects

Publication Year: 2017, Article Sequence Number: 3101205
| | PDF (607 KB) | HTML

We propose a low-voltage, low-current interconnect architecture using buffered/pipelined spin-torque (ST) sensors to optimize the overall delay and energy consumption. Conventional techniques for reducing energy consumption on long interconnects involve low voltage swings on interconnects or current-mode interconnects. However, such techniques require power-consuming voltage converters or trans-im... View full abstract»

• ### Theory of Spin Torque Switching Current for the Double Magnetic Tunnel Junction

Publication Year: 2017, Article Sequence Number: 4306505
| | PDF (347 KB) | HTML

A single-domain model for spin-transfer torque switching of double magnetic tunnel junctions with perpendicularly magnetized layers is developed. An analytical formula is derived for the switching current threshold, Ic0. Surprisingly, the model predicts that the switching current can be reduced by a factor of 10 compared to single magnetic tunnel junctions, for sufficiently large spin-p... View full abstract»

• ### Skyrmion State Stability in Magnetic Nanodots With Perpendicular Anisotropy

Publication Year: 2015, Article Sequence Number: 4000104
Cited by:  Papers (11)
| | PDF (394 KB) | HTML

Stability of skyrmion magnetization configuration in a circular magnetic nanodot with an uniaxial anisotropy perpendicular to the dot plane is calculated. It is shown that the skyrmion state can have magnetic energy lower than the vortex and perpendicular single domain state in a finite range of magnetic anisotropy fields at room temperature even in the case of absence of the Dzyaloshinskii-Moriya... View full abstract»

• ### Synthesized Magnetic Field Focusing Using a Current-Controlled Coil Array

Publication Year: 2016, Article Sequence Number: 6501504
| | PDF (538 KB) | HTML

A novel synthesized magnetic field focusing (SMF) technology is proposed and nonradiative but focused magnetic field is experimentally demonstrated as a one-dimensional example. Contrary to common belief, a magnetic field can be focused arbitrarily by increasing the number of current-controlled transmitting coils in a manner similar to that of conventional beam-forming. Moreover, the proposed SMF ... View full abstract»

• ### A New Magnetizer for Measuring the Two-Dimensional Magnetic Properties of Nanocrystalline Alloys at High Frequencies

Publication Year: 2017, Article Sequence Number: 6501705
| | PDF (782 KB) | HTML

Nanocrystalline alloys are used extensively in high-frequency electromagnetic applications for their low magnetic losses and high saturation flux densities. To characterize their vector magnetic properties over a broad frequency range, a new magnetizer with a compact flux density-field B-H sensor was developed for two-dimensional testing up to 10 kHz. View full abstract»

• ### Nanometer-Thick Yttrium Iron Garnet Films With Extremely Low Damping

Publication Year: 2014, Article Sequence Number: 6700104
Cited by:  Papers (23)
| | PDF (299 KB) | HTML

Yttrium iron garnet (YIG) films that are in the nanometer thickness range and show extremely low damping are reported. The films were deposited via sputtering at room temperature and were then annealed in O2 at high temperature. A 22-nm-thick YIG film showed a Gilbert damping constant α = (8.58 ± 0.21) × 10-5, which represents the lowest damping ever repo... View full abstract»

• ### Two-Dimensional Magnetic Semiconductors Based on Transition-Metal Dichalcogenides V $X_2$ ($X$ = S, Se, Te) and Similar Layered Compounds VI$_{{2}}$ and Co(OH)$_{{2}}$

Publication Year: 2017, Article Sequence Number: 3101405
| | PDF (469 KB) | HTML

We present a new type of two-dimensional (2D) magnetic semiconductor based on transition-metal dichalcogenides MX2 (M = V, Co; X = S, Se, Te, I, OH) via first-principles calculations. The obtained band gaps of monolayer (ML) VS2, VSe2, and VTe2 in the H-phase given from the generalized gradient approximation (GGA) are respectively 0.05, 0.22, and 0.20 eV... View full abstract»

• ### CoFeB Thickness Dependence of Damping Constants for Single and Double CoFeB-MgO Interface Structures

Publication Year: 2015, Article Sequence Number: 5700303
Cited by:  Papers (3)
| | PDF (264 KB) | HTML

We investigate the CoFeB thickness dependence of the damping constant α of single and double CoFeB-MgO interface structures by vector-network-analyzer ferromagnetic resonance (VNA-FMR). The damping constant increases with decreasing the CoFeB thickness for the single interface structure, and the damping constant for the double-interface structure takes a similar value to that for the single... View full abstract»

• ### Current Modulation of Nanoconstriction Spin-Hall Nano-Oscillators

Publication Year: 2017, Article Sequence Number: 3704804
| | PDF (366 KB) | HTML

A single nanoconstriction spin-Hall nano-oscillator (NC-SHNO) in out-of-plane fields is presented as a nonlinear amplitude and frequency modulator operated by radio-frequency (RF) current modulation. The current modulation was carried out in different NC-SHNO nonlinearity regimes corresponding to negative, zero, and positive values of df/dI in order to investigate the device response to an 80 MHz ... View full abstract»

• ### High-Frequency Coupling of Magnetic Fields and Its Impact on Magnetic Force Measurement in Space Missions

Publication Year: 2017, Article Sequence Number: 1303205
| | PDF (268 KB) | HTML

Specific precautions are required for magnetic force verification in space missions intended to measure dynamic effects due to induced forces on test masses. These missions typically need not only magnetic cleanliness of almost time-constant fields, but have even more demanding requirements on slowly time-varying magnetic effects. Furthermore, high frequency magnetic fields generated by the spacec... View full abstract»

• ### Temporal Evolution of Auto-Oscillations in an Yttrium-Iron-Garnet/Platinum Microdisk Driven by Pulsed Spin Hall Effect-Induced Spin-Transfer Torque

Publication Year: 2017, Article Sequence Number: 3104304
| | PDF (297 KB) | HTML

The temporal evolution of pulsed spin Hall effect-spin transfer torque (SHE-STT) driven auto-oscillations in a yttrium iron garnet (YIG)-platinum (Pt) microdisk is studied experimentally using time-resolved Brillouin light scattering spectroscopy. The frequency of the auto-oscillations is different in the center when compared to the edge of the disk and is related to the simultaneous STT excitatio... View full abstract»

• ### Spin Torque Switching in Nanopillars With Antiferromagnetic Reference Layer

Publication Year: 2017, Article Sequence Number: 3100605
| | PDF (444 KB) | HTML

Spin-transfer-torque-induced switching is investigated in 200 nm diameter circularly shaped, perpendicularly 10 magnetized nanopillars. A synthetic antiferromagnet, consisting of two Co/Ni multilayers coupled antiferromagnetically 11 across a Ru layer, is used as a reference layer to minimize the dipolar field on the free layer. The free layer is a single 12 4 × [Co/Ni] multilayer. The use ... View full abstract»

• ### Write Error Rate and Read Disturbance in Electric-Field-Controlled Magnetic Random-Access Memory

Publication Year: 2017, Article Sequence Number: 3102705
| | PDF (742 KB) | HTML

We report experimental results on write error rate and read disturbance as a function of read/write pulse width and amplitude in electric-field-controlled magnetic tunnel junctions (MTJs). Results are shown for 50 nm perpendicular MTJs. We also design and simulate the performance of a 256 kilobit (Kbit) magneto-electric random-access memory (MeRAM) macro in a 28 nm complementary metal-oxide semico... View full abstract»

• ### Current-Induced Dynamics of Multiple Skyrmions With Domain-Wall Pair and Skyrmion-Based Majority Gate Design

Publication Year: 2017, Article Sequence Number: 4305705
| | PDF (997 KB) | HTML

As an intriguing, ultrasmall, particle-like magnetic texture, skyrmions have attracted a lot of research interest for next-generation, ultradense, low-power magnetic memory/logic designs. Previous studies have demonstrated a single skyrmion domain-wall pair collision in a specially designed magnetic racetrack junction. We investigate the dynamics of multiple skyrmions with a domain-wall pair in a ... View full abstract»

• ### Perpendicular Magnetic Anisotropy and Interfacial Dzyaloshinskii-Moriya Interaction in Pt/CoFeSiB Structures

Publication Year: 2017, Article Sequence Number: 3100504
| | PDF (347 KB) | HTML

Magnetic materials exhibiting perpendicular magnetic anisotropy (PMA) have an important role in the development of high-density magnetic random-access memory and domain-wall devices. Exotic physical phenomena result from spin-orbit coupling, such as PMA and the interfacial Dzyaloshinskii-Moriya interaction (iDMI), at interfaces between nonmagnetic (NM) and ferromagnetic (FM) materials. We report o... View full abstract»

• ### High-Speed, Low-Power, Magnetic Non-Volatile Flip-Flop With Voltage-Controlled, Magnetic Anisotropy Assistance

Publication Year: 2016, Article Sequence Number: 3106205
| | PDF (619 KB) | HTML

A magnetic non-volatile flip-flop (MNV-FF) design, with the assistance of voltage-controlled magnetic anisotropy (VCMA) effect, is proposed for low-power and high-speed applications. The MNV-FF employs perpendicular-anisotropy magnetic junnel junctions (MTJs) and exploits the VCMA effect for assisting data backup operations, in cooperation with either spin-transfer torque (STT) or spin-Hall effect... View full abstract»

• ### Perpendicular Magnetic Anisotropy and Easy Cone State in Ta/Co60Fe20B20 /MgO

Publication Year: 2015, Article Sequence Number: 3500404
Cited by:  Papers (10)
| | PDF (506 KB) | HTML

We used broadband ferromagnetic resonance (FMR) spectroscopy to measure the second- and fourth-order perpendicular magnetic anisotropies in Ta/(t) Co60Fe20B20/MgO layers over a Co60Fe20B20 thickness range of 5.0 nm ≥ t ≥ 0.8 nm. Fort > 1.0 nm, the easy axis is in the plane of the film, but when t <; 1.0 nm, the e... View full abstract»

• ### High-Time-Resolution Nuclear Magnetic Resonance With Nitrogen-Vacancy Centers

Publication Year: 2016, Article Sequence Number: 6502305
Cited by:  Papers (1)
| | PDF (758 KB) | HTML

We present a field-programmable gate array (FPGA)-based solution for high-time-resolution nanoscale nuclear magnetic resonance, with nitrogen-vacancy centers as a probe. The Xilinx FPGA is used to implement a high-performance pulse generator, which contributes to high-precision measurement for the nuclear magnetic resonance (NMR) signal. The pulse generator outputs continuous pulses with a time re... View full abstract»

• ### Array-Level Analysis of Magneto-Electric Random-Access Memory for High-Performance Embedded Applications

Publication Year: 2017, Article Sequence Number: 4305905
| | PDF (1511 KB) | HTML

An array-level evaluation of magneto-electric random-access memory (MeRAM) is conducted by comparing its performance with that of other embedded technologies. We consider MeRAM cells with one transistor and one magnetic tunnel junction (1T-1MTJ) structure, where writing of the two-terminal MTJ bit is performed by precessional reorientation of the magnetization via voltage control of the magnetic a... View full abstract»

• ### Multiple-Order Magnetic Gradient Tensors for Localization of a Magnetic Dipole

Publication Year: 2017, Article Sequence Number: 6506605
| | PDF (451 KB) | HTML

This letter gives expressions for the second-order and third-order gradient tensors produced by a magnetic dipole. We describe a method for extracting second-order and third-order gradient tensor components from a uniaxial magnetic field sensor mounted on a spinning disk that undergoes orbital motion about multiple axes. Experiments for localization of a magnetic dipole, which has many application... View full abstract»

• ### Demonstration of Ultralow Bit Error Rates for Spin-Torque Magnetic Random-Access Memory With Perpendicular Magnetic Anisotropy

Publication Year: 2011, Article Sequence Number: 3000204
Cited by:  Papers (45)  |  Patents (6)
| | PDF (495 KB) | HTML

Bit error rates below 10-11 are reported for a 4-kb magnetic random access memory chip, which utilizes spin transfer torque writing on magnetic tunnel junctions with perpendicular magnetic anisotropy. Tests were performed at wafer level, and error-free operation was achieved with 10 ns write pulses for all nondefective bits during a 66-h test. Yield in the 4-kb array was limited to 99% ... View full abstract»

• ### Balanced Metal Detector Based on Optimized Frequencies and Spatial Phase Profile Responses to Differentiate Metal Rods

Publication Year: 2017, Article Sequence Number: 1305005
| | PDF (1232 KB) | HTML

Inductive detection with double-balanced coils and a spatial phase profile were used to identify copper and steel rods in a composite target. The electromagnetic detection system was designed and validated with a dipole model. Simulations and experiments identified whether a target was copper, steel, or a combination. The system, optimized for excitation at high audio frequencies, was able to esti... View full abstract»

• ### Curie Temperature Engineering in High Entropy Alloys for Magnetocaloric Applications

Publication Year: 2016, Article Sequence Number: 6105005
| | PDF (405 KB) | HTML

High entropy alloys (HEAs) are useful in applications that requir high strength, oxidation resistance, and high temperature stability. Research on HEAs for magnetocaloric applications focuses on increasing the refrigeration constant and controlling the Curie temperature (Tc). Here we investigate the effect of metal additions on exchange interaction distributions in eqiatomic ferromagnet... View full abstract»

• ### Invariant Calibration of Magnetic Tensor Gradiometers

Publication Year: 2017, Article Sequence Number: 6505105
| | PDF (262 KB) | HTML

Magnetic tensor gradiometers are based on multiple sensors arranged in a unified coordinate system. Current calibration methods focus on each gradient tensor component separately, rather than the entire tensor system, so the advantages of tensor measurement are not completely realized. In this letter, the nonorthogonal error, misalignment error, scale-factor error, and zero offset in a magnetic te... View full abstract»

• ### Domain Structure in CoFeB Thin Films With Perpendicular Magnetic Anisotropy

Publication Year: 2011, Article Sequence Number: 3000304
Cited by:  Papers (45)
| | PDF (447 KB) | HTML

Domain structures in CoFeB-MgO thin films with a perpendicular easy magnetization axis were observed by magneto-optic Kerr-effect microscopy at various temperatures. The domain-wall surface energy was obtained by analyzing the spatial period of the stripe domains and fitting established domain models to the period. In combination with superconducting quantum interference device measurements of mag... View full abstract»

• ### Asymmetric Interfacial Perpendicular Magnetic Anisotropy in Pt/Co/Pt Trilayers

Publication Year: 2011, Article Sequence Number: 3000504
Cited by:  Papers (38)
| | PDF (353 KB) | HTML

An asymmetry in the interfacial anisotropies of Pt/Co and Co/Pt interfaces was observed in Pt/Co/Pt sputtered trilayers, the interfacial anisotropy arising from the bottom Pt/Co interface being significantly higher than that from the top Co/Pt one. Interdiffusion at the top interface is believed to be the main factor for this asymmetry. It dramatically decreases the anisotropy of the stack when th... View full abstract»

• ### Steinmetz Equation for Gapped Magnetic Cores

Publication Year: 2016, Article Sequence Number: 1302704
Cited by:  Papers (1)
| | PDF (416 KB) | HTML

This letter presents a derivation of the modified Steinmetz empirical equation for power loss density and power loss in magnetic cores with air gaps. The modified Steinmetz equation relates the core power loss density with the air gap length, magnitude and frequency of the sinusoidal excitation current, and the permeability of the core material. The reluctance model of a representative core struct... View full abstract»

• ### Impact of Ta Diffusion on the Perpendicular Magnetic Anisotropy of Ta/CoFeB/MgO

Publication Year: 2013, Article Sequence Number: 1000104
Cited by:  Papers (41)
| | PDF (318 KB) | HTML

Effects of Ta diffusion on the perpendicular magnetic anisotropy (PMA) of Ta/Co0.6Fe0.2B0.2 (12.5 Å)/MgO stacks were investigated. We found that Ta initially mixed with Co0.6Fe 0.2B0.2 and its diffusion became prominent above 300 °C. Initial diffusion of Ta into the Co0.6 Fe0.2B0.2 was ... View full abstract»

• ### Normally-Off Computing and Checkpoint/Rollback for Fast, Low-Power and Reliable Devices

Publication Year: 2017, Page(s): 1
| | PDF (1028 KB)

Since the advent of complementary metal oxide semiconductors (CMOS), the number of transistor per die never stops increasing to reach today several billion of transistors. As a result, design and fabrication of smart devices able to run at high speed has been possible. However, the power consumption of systems-on-chip has significantly increased due to the high density integration and the high lea... View full abstract»

• ### Optimization of the Magnetic Properties of Hot Deformed Nd-Fe-B Magnets

Publication Year: 2017, Article Sequence Number: 5500204
| | PDF (1729 KB) | HTML

We investigated the effects of density of Nd-Fe-B isotropic MQ2 counterparts and hot deformation parameters, including temperature and time, on the microstructure, (0 0 L) texture, and magnetic properties of anisotropic MQ3 magnets. A higher MQ2 density yields a more homogeneous density distribution throughout the MQ2 magnet. When the MQ2 density reaches 7.58 g/cm3, the grain size is as... View full abstract»

• ### Torsion Stress Induced Magnetic Switching in Amorphous Microwires

Publication Year: 2017, Article Sequence Number: 5106805
| | PDF (574 KB) | HTML

The mechanisms of magnetization reversal related to anisotropy change were analyzed using magneto-optical Kerr effect in Co- and Fe-rich microwires with different signs of magnetostriction. The reversible switching between inclined magnetic states and transformation of different inclined states was controlled by external torsion stress. View full abstract»

• ### Thickness Assessment of Thermal Barrier Coatings of Aeroengine Blades Via Dual-Frequency Eddy Current Evaluation

Publication Year: 2016, Article Sequence Number: 1304905
| | PDF (951 KB) | HTML

A thermal barrier coating (TBC), consisting of the top and bond coatings, is normally deployed over the alloying body of an aeroengine blade in order to protect the blade from hostile environments. Thickness loss of TBC severely undermines the structural integrity of blades, and thus leads to the failure of aeroengines. Before catastrophic accidents occur, it is important to nonintrusively assess ... View full abstract»

• ### High-Resolution Magneto-Optical Kerr-Effect Spectroscopy of Magnon Bose–Einstein Condensate

Publication Year: 2016, Article Sequence Number: 3501805
| | PDF (626 KB) | HTML

Using a novel heterodyne magneto-optical Kerr-effect technique, we have studied the spectral characteristics of a room-temperature magnon Bose-Einstein condensate (BEC) in yttrium-iron-garnet (YIG) films. Thanks to the ultimate frequency resolution of the technique of better than 100 Hz, we were able to directly determine the spectral linewidth of the spontaneously formed condensate of microwave-f... View full abstract»

• ### Estimating Exchange Stiffness of Thin Films With Perpendicular Anisotropy Using Magnetic Domain Images

Publication Year: 2016, Article Sequence Number: 6507305
Cited by:  Papers (1)
| | PDF (379 KB) | HTML Media

The exchange stiffness and domain wall width of magnetic thin films with perpendicular magnetic anisotropy are obtained using Kerr microscopy in conjunction with vibrating sample magnetometer measurements. This approach requires only knowledge of saturation magnetization, the effective out-of-plane anisotropy energy, and an image of the demagnetized domain pattern, from which the demagnetization e... View full abstract»

• ### The Misconception of Closed Magnetic Flux Lines

Publication Year: 2017, Article Sequence Number: 1306005
| | PDF (204 KB) | HTML

The belief that magnetic flux lines are always closed has been widely disseminated, handed down from Faraday through the present day. We review the problem and revisit the example of “the wire and the loop,” which shows analytically that flux lines are not necessarily closed, and extend its analysis. The pictorial representation based on flux lines may give rise to erroneous conclusi... View full abstract»

• ### Energy-Efficient Memory Using Magneto-Electric Switching of Ferromagnets

Publication Year: 2017, Article Sequence Number: 4306905
| | PDF (427 KB) | HTML

Recent experiments on voltage-driven magneto-electric (ME) switching of ferromagnets has shown potential for future low-energy, high-speed, nonvolatile spintronic memory. In this letter, we first analyze two different ME devices—an ME magnetic-tunnel-junction (ME-MTJ) device and an ME-xnor device—with respect to writability, readability, and switching speed. The basic operat... View full abstract»

• ### Design of On-Chip Readout Circuitry for Spin-Wave Devices

Publication Year: 2017, Article Sequence Number: 3100804
Cited by:  Papers (1)
| | PDF (696 KB) | HTML

We present the design of readout circuitry based on complementary metal-oxide semiconductors (CMOS) for spin-waves. The circuit provides the functionality of a high-speed oscilloscope/spectrum analyzer, and can be integrated with a spin-wave-based signal processing device. The circuit consumes sub-50 mW power and requires an area below 1 mm2. A spin-wave-based processing system, when co... View full abstract»

• ### Loss Decomposition in Non-Oriented Steel Sheets: The Role of the Classical Losses

Publication Year: 2016, Article Sequence Number: 5106105
| | PDF (522 KB) | HTML

The concept of loss separation based on the statistical theory of losses (STL) provides complete and accurate description of the frequency dependence of the energy losses in non-oriented soft magnetic sheets under the assumption of uniform magnetization reversal through the sheet cross-section. This assumption, implying a simple standard formulation for the classical loss component, has been recen... View full abstract»

• ### Polymer Magnetic Composite Core Boosts Performance of Three-Dimensional Micromachined Inductive Contactless Suspension

Publication Year: 2016, Article Sequence Number: 1307603
| | PDF (460 KB) | HTML Media

We introduce a newly developed polymer magnetic composite for use as a high resistivity, high permeability magnetic core to significantly improve the energy consumption of micromachined inductive suspensions. Compared to a similar inductive suspension structure without a core, the electrical current required to obtain a levitation height of 110 μm is 65 mA versus 120 mA. The use of the core... View full abstract»

• ### Ferromagnetic and Spin-Wave Resonance on Heavy-Metal-Doped Permalloy Films: Temperature Effects

Publication Year: 2017, Article Sequence Number: 3502604
| | PDF (439 KB) | HTML

Broadband ferromagnetic resonance (FMR) spectroscopy is used to study the temperature (T) and dopant-concentration dependence of the magnetodynamic properties of Permalloy (Py = Ni80Fe20) and Py100-xMx films, where the dopant M = Pt, Au, and Ag. The saturation magnetization (MS) and Gilbert damping constant (α) are determined from the uniform FMR mode, while the spin wave stiffness (D) is e... View full abstract»

• ### Control of Iron Oxide Nanoparticle Clustering Using Dual Solvent Exchange

Publication Year: 2016, Article Sequence Number: 1700904
Cited by:  Papers (1)
| | PDF (443 KB) | HTML

Superparamagnetic iron oxide nanoparticles (SPIOs) have considerable promise for magnetic resonance imaging, drug/gene delivery, and hyperthermia applications. It has been shown recently that self-assembly of SPIOs into large superstructures can have a significant impact on their magnetic properties and functionality. In this work, we developed a novel method for controlling the clustering of SPIO... View full abstract»

• ### Magnetic Domain Structure and Magnetostriction of Fe-Ga Single Crystal Grown by the Czochralski Method

Publication Year: 2017, Article Sequence Number: 6101004
| | PDF (591 KB) | HTML

The magnetic domain structure on the (0 0 1) plane of an Fe16.1Ga83.9 single crystal grown by the Czochralski method was observed by magneto-optic Kerr effect microscopy. In zero magnetic field, four different domain phases appeared, with magnetization in four kinds of '1 0 0 magnetic easy directions on the (0 0 1) plane. That is, the magnetic domain structure in zero field w... View full abstract»

• ### Control of Magnon-Photon Coupling Strength in a Planar Resonator/Yttrium-Iron-Garnet Thin-Film Configuration

Publication Year: 2017, Article Sequence Number: 3703105
| | PDF (386 KB) | HTML

A systematic study of the coupling at room temperature between ferromagnetic resonance and a planar resonator is presented. The chosen magnetic material is a ferrimagnetic insulator (yttrium iron garnet, YIG) which is positioned on top of a stop band (notch) filter based on a stub line capacitively coupled to a 50 Ω microstrip line resonating at 4.731 GHz. Control of the magnon-photon coupl... View full abstract»

• ### CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions

Publication Year: 2012, Article Sequence Number: 3000204
Cited by:  Papers (41)
| | PDF (253 KB) | HTML

Thermal stability factor Δ of the recording layer was studied in perpendicular anisotropy CoFeB/MgO magnetic tunnel junctions (p-MTJs) with various CoFeB recording layer thicknesses and junction sizes. In all series of p-MTJs with different thicknesses, Δ is virtually independent of the junction sizes of 48-81 nm in diameter. The values of Δ increase linearly as the recording ... View full abstract»

• ### Low-Power, High-Density Spintronic Programmable Logic With Voltage-Gated Spin Hall Effect in Magnetic Tunnel Junctions

Publication Year: 2016, Article Sequence Number: 3102505
Cited by:  Papers (1)
| | PDF (1123 KB) | HTML

A non-volatile spintronic programmable logic (SPL), based on a 3-teriminal magnetic tunnel junction (MTJ), is presented and simulated using a compact device model. The SPL structure is compatible with CMOS technology and can be fabricated in the back end of line (BEOL). The proposed SPL exploits gate-voltage-modulated spin Hall effect (V-SHE) switching, which combines the voltage-controlled magnet... View full abstract»

• ### Magnetophoretic Velocity Determined by Space- and Time-Resolved Extinction Profiles

Publication Year: 2015, Article Sequence Number: 1700104
Cited by:  Papers (1)
| | PDF (445 KB) | HTML

Magnetophoretic velocity of magnetic nano-objects for biomedical applications was characterized by measuring space- and time-resolved extinction profiles (STEP-Technology) using a customized LUMiReader device equipped with a set of permanent magnets (STEP-MAG). The resulting magnetic fields and gradients in a sample volume enable the operator to choose measurement conditions for magnetic micro- an... View full abstract»

## Aims & Scope

IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics.

Full Aims & Scope

## Meet Our Editors

Editor
Ron B. Goldfarb
National Institute of Standards and Technology