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# IEEE Magnetics Letters

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Displaying Results 1 - 25 of 71
• Electromagnetics
• ### High-Frequency Coupling of Magnetic Fields and Its Impact on Magnetic Force Measurement in Space Missions

Publication Year: 2017, Article Sequence Number: 1303205
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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»

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

Publication Year: 2017, Article Sequence Number: 1305005
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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»

• ### The Misconception of Closed Magnetic Flux Lines

Publication Year: 2017, Article Sequence Number: 1306005
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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»

• ### PCB Coil Design Producing a Uniform Confined Magnetic Field

Publication Year: 2017, Article Sequence Number: 1306205
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We present a magnetic field confining coil with a sub-10−3 field uniformity over a large fraction of the coil. The structure is entirely made out of printed circuit boards (PCBs). The PCB design allows the path of the wires to be tailored to fit the required geometry. We measure the field uniformity with cesium magnetometers in a field range from 1 to 10 µT. Our app... View full abstract»

• Magnetism in Solids
• ### Pressure Effect on Magnetism of Weak Itinerant Electron Ferromagnet $\mathrm{Ni}_{74.6}\mathrm{Al}_{25.4}$

Publication Year: 2017, Article Sequence Number: 1400403
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Pressure effect on the magnetic properties of intermetallic compound Ni74.6Al25.4 was investigated in pressures P up to 1.2 GPa. Spontaneous magnetic moment ps and Curie temperature TC decreased linearly with applying pressure. The dps/dP and dTC/dP were -0.995 x 10-5 μB/MPa and -4.57 x 10-3 K/MPa, respectively. These obtaine... View full abstract»

• ### Effects of Annealing Temperature and Magnetic Field on the $\varepsilon\hbox{--}\tau$ Phase Transformation in Mn-Al Alloys

Publication Year: 2017, Article Sequence Number: 1400704
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Magnetic field effects on the transformation from the hexagonal close-packed ε-phase to the ferromagnetic L10 τ-phase were evaluated for Mn-Al alloys annealed at 573, 623 and 673 K in magnetic fields up to 15 T. The phase transformation from the ε-phase to the τ-phase was enhanced by the magnetic field for the 623 K annealing temperature. These in-field annea... View full abstract»

• ### Thermal Transformation Arrest Phenomena in Mn2Sb0.9Sn0.1

Publication Year: 2017, Article Sequence Number: 1402404
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Magnetic and structural properties of Sn-substituted Mn2Sb were investigated. A first-order magnetic transition (FOMT) from a ferrimagnetic (FRI) to an antiferromagnetic state occurred between 100 and 200 K, which was accompanied by an iso-structural transformation. Upon cooling in 5 T, the residual FRI phase was observed even at 10 K, and the residual FRI phase slightly decreased with ... View full abstract»

• ### Magnetic Phase Transition of ${\mathrm {La}}_{1-{\mathrm x}}{\mathrm {Sr}}_{\mathrm x}{\mathrm {MnO}}_3$ Induced by Charge Transfer and Interdiffusion

Publication Year: 2017, Article Sequence Number: 1402905
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Rare earth manganites under hole doping, R1-xBxMnO3 (R = La, Nd, Pr and B = Sr, Ca, Ba), have a rich charge carrier-temperature-magnetism phase diagram. The phases are tunable by applying external constraints, such as strain and boundary conditions. For example, the ferromagnetic phase dominated by the double-exchange mechanism can be transformed into an antiferrom... View full abstract»

• Biomagnetics
• ### Effect of Surface Charge on the Uptake of Magnetic Nanoparticles in Mouse Fibroblast Cells

Publication Year: 2017, Article Sequence Number: 1502505
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We synthesized surface-charged functionalized magnetic nanoparticles (MNPs) with three polymer coatings. Neutral, positive, and negative MNPs, about 12 nm in size, were obtained by coating with dextran (DEX), aminopropyltriethoxylsilane (APS), and polystyrene sulfonic acid (PSS), respectively. The superparamagnetic properties of the MNPs where characterized. DEX-MNPs had the highest biocompatibili... View full abstract»

• ### Scanning Magneto-Inductive Sensor for Quantitative Assay of Prostate-Specific Antigen

Publication Year: 2017, Article Sequence Number: 1506305
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Among analytical tests available for point-of-care diagnostics, the lateral flow immunoassay (LFIA) stands out for its low-cost, speed, portability, and ease of use. By its nature, this paper-based instrument is qualitative, intended to provide a positive/negative reading. LFIA, coupled to a quantitative readout device that did not compromise its advantages, would be a powerful tool for many clini... View full abstract»

• Magnetochemistry
• ### Low Temperature Synthesis of M-Type Strontium Hexaferrite Nanocomposites

Publication Year: 2017, Article Sequence Number: 2103805
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Strontium hexaferrite nanocomposites were synthesized using the co-precipitation method in an air atmosphere at low temperature and annealed at temperatures from 400 to 850 °C. The synthesized nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and vibrati... View full abstract»

• ### Additive Manufacturing of Cobalt-Based Organic Ferromagnetic Materials

Publication Year: 2017, Article Sequence Number: 2104405
| | PDF (367 KB)

Clogging problems from the aggregation of dispersed solutes have hindered the successful application of inkjet printing for patterning ferromagnetic materials. Native ferromagnetic ink with complete solubility and proper surface tension for inkjet printing has been lacking. Here, we report a metal-organic molecule with absolute solubility in dimethylformamide (DMF) solvent, which can be successful... View full abstract»

• Magneto-Electronics
• ### Control of Room-Temperature Magnetoelectric Effect via the Initial Electric Phase State in Sr $_{3}$Co $_{2}$Fe$_{24}$ O$_{41}$ Hexaferrite

Publication Year: 2017, Article Sequence Number: 2503704
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The effects of the initial sweeping magnetic field (Hi) on the room-temperature magnetoelectric (ME) effect for polycrystalline Z-type hexaferrite Sr3Co2Fe24O41 were investigated. The results show that both the electric polarization (P) and ME coefficient (α) can be effectively controlled by Hi via its corresponding initial e... View full abstract»

• ### Frequency Response of a Coupled Magnetoelectric Hexaferrite Film on a Spiral Coil

Publication Year: 2017, Article Sequence Number: 2505504
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This letter presents an experimental assessment and evaluation of the frequency response of a recently proposed magneto-electric (ME) device (suitable for H- and E -field sensor and tuning applications). The device is fabricated by incorporating a single-phase ME hexaferrite thin film on a silicon substrate, which is able to operate at a few volts. A conductive buffer layer of indium tin oxide is ... View full abstract»

• No conference
• ### Ferroelastic Strain-Mediated Nonvolatile Tuning of Perpendicular Magnetic Anisotropy in (Co/Pt)3 /(1 1 1) Pb(Mg1/3Nb2/3)O3-PbTiO3 Multiferroic Heterostructures

Publication Year: 2017, Article Sequence Number: 2507205
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Nonvolatile control of perpendicular magnetic anisotropy (PMA) is of great technological importance for low-power spintronic devices. In this study, we successfully achieved ferroelastic strain-mediated nonvolatile tuning of PMA at room temperature in (Co/Pt)3/(1 1 1) Pb(Mg1/3Nb2/3)O3-PbTiO 3 multiferroic heterostructures. Electr... View full abstract»

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

Publication Year: 2017, Article Sequence Number: 3100504
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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»

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

Publication Year: 2017, Article Sequence Number: 3100605
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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»

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

Publication Year: 2017, Article Sequence Number: 3100804
Cited by:  Papers (1)
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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»

• ### Improved Signal-to-Noise Ratio in Current-Perpendicular-to-Plane Giant Magnetoresistance Sensors Using Strong Exchange-Biased Reference Layers

Publication Year: 2017, Article Sequence Number: 3101104
Cited by:  Papers (1)
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We present experimental studies of simple-pinned current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) sensors demonstrating large gains in signal-to-noise ratio from improvements in reference layer exchange pinning strength Jk and magnetoresistance ratio AR/R. Significant increases in Jk from 0.7 to 1.25 erg/cm2 and AR/R from 7.5% to 13% are achieve... View full abstract»

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

Publication Year: 2017, Article Sequence Number: 3101205
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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»

• ### 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
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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»

• ### Magnetization and Spin Polarization of Heusler Alloys Co $_{2}$TiSn and Co$_{2}$ TiGa$_{0.5}$Sn $_{0.5}$

Publication Year: 2017, Article Sequence Number: 3101604
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The substitution effect on half-metallicity for Co-based Heusler alloys Co2TiGa1-xSnx was investigated by experimental measurements and first-principles band calculations. The synthesized alloys crystalized in the ordered L21 crystal structure. The spontaneous magnetization obeyed the Slater-Pauling rule, indicating the possibility that Co2TiS... View full abstract»

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

Publication Year: 2017, Article Sequence Number: 3102705
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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»

• ### Perpendicular Anisotropic Magnetoresistance Induced by Surface Spin-Orbit Scattering in a MgO/Fe/Cu Heterostructure

Publication Year: 2017, Article Sequence Number: 3103604
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A large perpendicular anisotropic magnetoresistance (AMR) is obtained in a MgO/Fe/Cu heterostructure, with a maximum AMR ratio of 0.59%. The perpendicular AMR is approximately inversely dependent on the thickness of the Fe layer above 2.5 nm. It can be increased by enhanced structural asymmetry, which implies an interface effect mainly derived from interfacial Rashba spin-orbit scattering in the M... 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
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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»

## 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.

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## Meet Our Editors

Editor
Ron B. Goldfarb
National Institute of Standards and Technology