Notice

IEEE Transactions on Magnetics

Filter Results

Displaying Results 1 - 25 of 29
• [Front cover]

Publication Year: 2010, Page(s): C1
| PDF (160 KB)
• IEEE Transactions on Magnetics publication information

Publication Year: 2010, Page(s): C2
| PDF (39 KB)

Publication Year: 2010, Page(s):1 - 2
| PDF (65 KB)
• IEEE Magnetics Society Distinguished Lecturers for 2010

Publication Year: 2010, Page(s):3 - 6
| PDF (965 KB)
• Spin-Polarized Transport Phenomena in Double Magnetic Tunnel Junctions Caused by Ferromagnetic CoFe Nanoparticles

Publication Year: 2010, Page(s):7 - 9
Cited by:  Papers (2)
| | PDF (237 KB) | HTML

We present some unusual spin-polarized transport phenomena in asymmetric double barrier magnetic tunneling junctions (ADBMTJs) with CoFe/AlOx/ferromagnetic nanoparticle (FM-NPs)/AlOx/Ta structures. The conductance curves and the magnetoresistance ratio clearly oscillate with applied bias voltage, indicating the presence of Coulomb blockade effects due to isolated ferromagneti... View full abstract»

• Structural Stability and Magnetic Properties of the TbCu$_{7}$ -Type SmCo$_{x - 0.4}$Ti$_{0.4} (x = 5.0hbox{–}8.5)$ Alloys

Publication Year: 2010, Page(s):10 - 14
Cited by:  Papers (1)
| | PDF (398 KB) | HTML

We have studied the composition dependence, thermal stability, long-term stability at 500°C, and magnetic properties of the nanostructural TbCu7-type (1:7) Sm-Co-Ti alloys. We prepared the SmCox-0.4Ti0.4 alloys with a wide composition range from x = 5.0 to x = 8.5 by high-energy ball-milling, followed by annealing at 700-1100°C for 2 h. After an... View full abstract»

• Temperature Dependence of Resistivity of Sintered Rare-Earth Permanent-Magnet Materials

Publication Year: 2010, Page(s):15 - 20
Cited by:  Papers (23)
| | PDF (415 KB) | HTML

We studied the resistivity of rare-earth permanent-magnet materials over the temperature range -40Â°C to +150Â°C. We investigated three different materials from four manufacturers, including Nd2 Fe14 B, SmCo5 , and Sm2 Co17 , and measured their resistivities and temperature coefficients. We found that rare-earth permanent-magnet materials show... View full abstract»

• Implementation of the Preisach-Stoner-Wohlfarth Classical Vector Model

Publication Year: 2010, Page(s):21 - 28
Cited by:  Papers (14)
| | PDF (921 KB) | HTML

A useful vector magnetic model must accurately simulate both the magnitude and direction of the magnetization when a magnetic medium is subjected to a linear or rotating applied field. Such a model has been recently presented as the Preisach-Stoner-Wohlfarth (PSW) model. The Preisach model computes the magnitude of the magnetization; the Stoner-Wohlfarth model computes the direction of the magneti... View full abstract»

• Elimination of Nonphysical Solutions and Implementation of Adaptive Step Size Algorithm in Time-Stepping Finite-Element Method for Magnetic Field–Circuit–Motion Coupled Problems

Publication Year: 2010, Page(s):29 - 38
Cited by:  Papers (14)
| | PDF (1229 KB) | HTML

The time-stepping finite-element method (FEM) has become a powerful tool in solving transient electromagnetic fields. The formulation can include complex issues such as time harmonics and space harmonics, nonlinear magnetic property of iron materials, external circuit, and mechanical motion in the system equations. However, as the derivatives of physical quantities are usually unknown at the initi... View full abstract»

• General Formulation of the Electromagnetic Field Distribution in Machines and Devices Using Fourier Analysis

Publication Year: 2010, Page(s):39 - 52
Cited by:  Papers (112)
| | PDF (1133 KB) | HTML

We present a general mesh-free description of the magnetic field distribution in various electromagnetic machines, actuators, and devices. Our method is based on transfer relations and Fourier theory, which gives the magnetic field solution for a wide class of two-dimensional (2-D) boundary value problems. This technique can be applied to rotary, linear, and tubular permanent-magnet actuators, eit... View full abstract»

• Spatial Harmonic Expansion for Use With Magnetic Sensor Arrays

Publication Year: 2010, Page(s):53 - 58
Cited by:  Papers (11)
| | PDF (718 KB) | HTML

In order to reduce the effects of external magnetic fields on the accuracy of magnetic sensor measurements used for the reconstruction of ac electric currents flowing in massive parallel conductors, we use a spatial circular harmonic expansion of the magnetic scalar potential. Thanks to the linearity of the magnetic field problem with respect to the sources, we can then apply the least squares inv... View full abstract»

• Microspeaker Diaphragm Optimization for Widening the Operating Frequency Band and Increasing Sound Pressure Level

Publication Year: 2010, Page(s):59 - 66
Cited by:  Papers (11)
| | PDF (682 KB) | HTML

We report on the optimization of a microspeaker diaphragm for widening the working frequency band between its first and second eigenfrequencies and increasing its sound pressure level (SPL). A metallic diaphragm produces a larger magnetic force and thus a higher sound pressure level; therefore a Ni-coating on a common poly ethylene naphthalene (PEN) diaphragm is appropriate. For the best diaphragm... View full abstract»

• Multi-Slice Modeling in Circuit-Field Coupled Systems Using Finite-Element and Modified Nodal Analyses

Publication Year: 2010, Page(s):67 - 74
Cited by:  Papers (5)
| | PDF (1044 KB) | HTML

We propose a systematic method for interfacing different 2-D low-frequency electromagnetic field slices and nonidentical multi-port circuit networks using finite-element (FE) and modified nodal analyses. Each independent field slice has its own length, geometry, materials, boundary conditions, and number of filamentary and massive conductors. Similarly, each multi-port circuit network can have dif... View full abstract»

• Inductance Calculations for Circular Coils of Rectangular Cross Section and Parallel Axes Using Bessel and Struve Functions

Publication Year: 2010, Page(s):75 - 81
Cited by:  Papers (35)
| | PDF (318 KB) | HTML

A simple method for calculating the mutual and self inductances of circular coils of rectangular cross section and parallel axes is presented. The method applies to non-coaxial as well as coaxial coils, and self inductance can be calculated by considering two identical coils which coincide in space. It is assumed that current density is homogeneous in the coil windings. The inductances are given i... View full abstract»

• Three-Dimensional Magnetohydrodynamic Calculation for Coupling Multiphase Flow in Round Billet Continuous Casting Mold With Electromagnetic Stirring

Publication Year: 2010, Page(s):82 - 86
Cited by:  Papers (13)
| | PDF (393 KB) | HTML

A 3-D combined finite element-finite volume for magnetohydrodynamic (MHD) calculation method considering the coupling flow field, heat transfer, and inclusion trajectory was developed, and the flow characteristics of molten steel and inclusion trajectory in round billet mold using electromagnetic stirring (EMS) were numerically investigated. The calculation results of magnetic field and temperatur... View full abstract»

• Using Embedded Dynamic Random Access Memory to Reduce Energy Consumption of Magnetic Recording Read Channel

Publication Year: 2010, Page(s):87 - 91
Cited by:  Papers (1)  |  Patents (5)
| | PDF (588 KB) | HTML

Although the performance of a magnetic recording read channel can be improved by employing advanced iterative signal detection and coding techniques, the method nevertheless tends to incur significant silicon area and energy consumption overhead. Motivated by recent significant improvement of high-density embedded dynamic random access memory (eDRAM) towards high manufacturability at low cost, we ... View full abstract»

• Media Corrosion: Not Just an Overcoat Problem

Publication Year: 2010, Page(s):92 - 94
Cited by:  Papers (2)
| | PDF (205 KB) | HTML

This paper demonstrates that electrochemical impedance spectroscopy combined with atomic force microscopy analysis can successfully characterize the coverage ability of an overcoat on perpendicular magnetic recording media. Rougher media, brought about by lower surface energy oxide segregants, can adversely impact the overcoat integrity. The role of the capping layer, and its ability to somewhat p... View full abstract»

• Capacity Approaching Run-Length-Limited Codes for Multilevel Recording Systems

Publication Year: 2010, Page(s):95 - 104
Cited by:  Papers (2)
| | PDF (350 KB) | HTML

We propose two constructions for multilevel run-length-limited (RLL) block codes for which the rates are very close to the capacity. For each code construction, we propose a variation that has the advantage of low complexity of encoding and decoding. We conducted a simulation to see the combined effect of channel coding and our proposed RLL coding over an optical recording channel. View full abstract»

• Comparison Between Viterbi Detectors for Magnetic Recording Channels Based on Regressive and Autoregressive Noise Models

Publication Year: 2010, Page(s):105 - 111
Cited by:  Papers (2)
| | PDF (206 KB) | HTML

A recent work presents a regressive noise model for the data-dependent correlated noise, at the output of a magnetic recording channel detector. We have generalized this channel model, considering digital equalization and a more efficient correlation matrix, in order to make a comparison with the usual detector in a more realistic environment. Simulation results show that the regressive detector p... View full abstract»

• An Improved Magnetic Equivalent Circuit Model for Iron-Core Linear Permanent-Magnet Synchronous Motors

Publication Year: 2010, Page(s):112 - 120
Cited by:  Papers (62)
| | PDF (874 KB) | HTML

The aim of this work is to establish an accurate yet simple method for predicting flux density distribution and iron losses in linear permanent-magnet synchronous motors (LPMSMs) for iterative design procedures. For this purpose, an improved magnetic equivalent circuit for calculation of the teeth and yoke flux densities in the LPMSMs is presented. The magnetic saturation of iron core is considere... View full abstract»

• Air-Gap Flux Density Distortion and Iron Losses in Anisotropic Synchronous Motors

Publication Year: 2010, Page(s):121 - 126
Cited by:  Papers (18)
| | PDF (369 KB) | HTML

The anisotropy of the rotor of the synchronous reluctance motor (sometimes assisted by permanent magnets) causes a high content of flux density harmonics. These harmonics cause flux density fluctuations in the stator iron teeth, and thus iron losses. These losses increase with the motor speed and are independent of the main flux, that is, they exist even during the flux-weakening operations. An an... View full abstract»

• A Quantitative Comparative Analysis of a Novel Flux-Modulated Permanent-Magnet Motor for Low-Speed Drive

Publication Year: 2010, Page(s):127 - 134
Cited by:  Papers (36)
| | PDF (1709 KB) | HTML

A novel low-speed flux-modulated (FM) permanent-magnet (PM) motor that breaks the traditional design rule, which stipulates that the number of stator pole pairs and the number of rotor pole pairs must be the same, is proposed. The FM motor has a special physical structure with iron segments in the air gap to modulate the magnetic field. In the design, the free space between adjacent stationary iro... View full abstract»

• Reduction of Cogging Force in Linear Permanent-Magnet Generators

Publication Year: 2010, Page(s):135 - 140
Cited by:  Papers (19)
| | PDF (260 KB) | HTML

Although linear permanent-magnet generators (LPMGs) are widely used for converting wave energy into electrical energy, they suffer from large cogging force. The cogging force causes oscillatory output power, which shortens lifetime and increases the maintenance costs of the generators. To reduce this force in the generator, we have designed and simulated a three-phase LPMG for direct wave energy c... View full abstract»

• Transformer Core Parameter Identification Using Frequency Response Analysis

Publication Year: 2010, Page(s):141 - 149
Cited by:  Papers (27)
| | PDF (284 KB) | HTML

We present a novel model-based approach for parameter identification of a laminated core, such as magnetic permeability and electrical conductivity, of power transformers on the basis of frequency response analysis (FRA) measurements. The method establishes a transformer core model using the duality principle between magnetic and electrical circuits for parameter identification with genetic algori... View full abstract»

• Investigation of Self-Excitation and Discharge Processes in an Air-Core Pulsed Alternator

Publication Year: 2010, Page(s):150 - 154
Cited by:  Papers (17)
| | PDF (662 KB) | HTML

The air-core pulsed alternator has advantages in the application of pulsed power region, such as in electromagnetic launchers. The self-excitation and discharge processes in an air-core alternator are more complicated than traditional iron-core generators. In this paper, a mathematical model of an air-core pulsed alternator is built and several critical problems are analyzed, such as the condition... View full abstract»

Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology