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# IEEE Transactions on Magnetics

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

Publication Year: 2008, Page(s): C1
| PDF (146 KB)
• ### IEEE Transactions on Magnetics publication information

Publication Year: 2008, Page(s): C2
| PDF (36 KB)

Publication Year: 2008, Page(s):2089 - 2090
| PDF (57 KB)
• ### Combinatorial Screening of the BiDyYb Iron Garnet Material System for High Kerr Rotation Composition

Publication Year: 2008, Page(s):2091 - 2094
Cited by:  Papers (2)
| | PDF (474 KB) | HTML

We investigated the (BixDyyYb3-x-y)Fe5O12 ternary combinatorial composition spread with the goal of finding new compositions with a large magneto-optical effect for possible use as magneto-optical storage materials. High-throughput magneto-optical characterization of the spread showed that the Dy0.6Yb0.5Bi1.9Fe... View full abstract»

• ### Effects of Surface Abrasion on Magnetization of VITROVAC 6025Z Ribbons

Publication Year: 2008, Page(s):2095 - 2099
| | PDF (181 KB) | HTML

The effects of abrading with sandpaper the surface of VITROVAC 6025Z ribbons on the parameters of their M -H loops (the coercive field Hc , the position of the center C, etc.) have been investigated. The application of surface fields HP (generated by core currents) enabled us to single out the effects of surface domains (surface domain structure (SDS) pinning) an... View full abstract»

• ### High Permeability and Low Loss Ni–Fe Composite Material for High-Frequency Applications

Publication Year: 2008, Page(s):2100 - 2106
Cited by:  Papers (56)
| | PDF (1684 KB) | HTML

A magnetic material with high permeability and low loss characteristics at high frequency is required for miniaturizing electronic components such as antennas. The key factors to keeping low magnetic loss are a high magnetic resonance frequency and the suppression of the eddy currents. We have fabricated a low-loss magnetic composite material by dispersing Ni 78Fe22 (permallo... View full abstract»

• ### Microstructure, Electrical, and Magnetic Properties of ZrO$_{2}$ Added MnZn Ferrites

Publication Year: 2008, Page(s):2107 - 2112
Cited by:  Papers (11)
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We investigated the influence of ZrO2 on the microstructure and electromagnetic properties of MnZn ferrites by characterizing fracture surface micrographs, magnetic properties, and dc resistivity. Powders of Mn 0.68Zn 0.25Fe 2.07O 4 composition were prepared by the conventional ceramic technique. Toroidal cores were sintered at 1350degC for 4 ... View full abstract»

• ### Generalization of the Classical Method for Calculating Dynamic Hysteresis Loops in Grain-Oriented Electrical Steels

Publication Year: 2008, Page(s):2113 - 2126
Cited by:  Papers (43)
| | PDF (889 KB) | HTML

We have studied the ability of two one-dimensional (1-D) time-stepping models, both based on the concept of magnetic viscosity, to reproduce dynamic loops and losses in grain-oriented (GO) electrical steels under arbitrary magnetization regimes. We found that GO steels (0.3 mm thick) can be modeled quite accurately at magnetizing frequencies up to 200 Hz by a thin sheet representation, which is ap... View full abstract»

• ### Room-Temperature Giant Magnetoelectric Effect From Coils Cored With MnZn Ferrite

Publication Year: 2008, Page(s):2127 - 2129
Cited by:  Papers (1)
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We have built coils with MnZn ferrite cores that demonstrate an appreciable giant magnetoelectric effect (GME). Their maximum magnetoelectric (ME) output is as high as 87 V/Oe at tens of kilohertz, which is remarkable for devices without any power supply. Our experimental and theoretical analyses suggest that the GME of the coils originates from LC resonances. Our results show a practical way to d... View full abstract»

• ### Micromagnetic Simulation of a Magnetic Film With Surface Roughness

Publication Year: 2008, Page(s):2130 - 2133
Cited by:  Papers (1)
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We have simulated micromagnetically the static magnetic structure and magnetic spectrum of a magnetic film with surface roughness, using a finite stripe film model. We found that the rough surface can lead to a ripple magnetic structure, which results in increasing the damping factor of the film, and that the damping factor increases with the increase of the root-mean-square roughness. For a parti... View full abstract»

• ### General Formulation for Magnetic Forces in Linear Materials and Permanent Magnets

Publication Year: 2008, Page(s):2134 - 2140
Cited by:  Papers (7)
| | PDF (156 KB) | HTML

A previous work described how a magneto-mechanical tensor can be obtained from the application of the virtual work principle to the energy density or co-energy density in any given media. This paper describes how the volume and surface force densities can be obtained from this tensor. Taking these force densities into account, we can calculate the total force over any given magnetic medium that is... View full abstract»

• ### Spin Wave Magnetic NanoFabric: A New Approach to Spin-Based Logic Circuitry

Publication Year: 2008, Page(s):2141 - 2152
Cited by:  Papers (118)  |  Patents (5)
| | PDF (1060 KB) | HTML

We describe a magnetic nanofabric, which may provide a route to building reconfigurable spin-based logic circuits compatible with conventional electron-based devices. A distinctive feature of magnetic nanofabric is that a bit of information is encoded into the phase of the spin wave signal. This makes it possible to transmit information without the use of electric current and to utilize wave inter... View full abstract»

• ### Multimodel Optimization Based on the Response Surface of the Reduced FEM Simulation Model With Application to a PMSM

Publication Year: 2008, Page(s):2153 - 2157
Cited by:  Papers (9)
| | PDF (280 KB) | HTML

This paper presents an analytical method for improving the optimal design of electromagnetic devices obtained analytically. This method extracts the significant parameters by using the gradient of difference between the outputs of the analytical model and those obtained with a finite-element method. These parameters are then employed to build a response surface in a reduced dimension space by usin... View full abstract»

• ### Mitigation of Cogging Force in Axially Magnetized Tubular Permanent-Magnet Machines Using Iron Pole-Piece Slotting

Publication Year: 2008, Page(s):2158 - 2162
Cited by:  Papers (10)
| | PDF (624 KB) | HTML

We present a method for reducing the cogging force in axially magnetized tubular permanent-magnet machines. The method consists of placing several similar slots on the iron pole-pieces. By choosing the appropriate positions of the pole-piece slots, specific harmonics of the cogging force can be eliminated, and, as a result, the cogging force may be greatly reduced. To obtain a general expression f... View full abstract»

• ### Programmable Design of Magnet Shape for Permanent-Magnet Synchronous Motors With Sinusoidal Back EMF Waveforms

Publication Year: 2008, Page(s):2163 - 2167
Cited by:  Papers (25)
| | PDF (564 KB) | HTML

The characteristics of a permanent-magnet synchronous motor (PMSM) are influenced greatly by the back-electromotive force waveforms in the motor, which are directly related to the magnet shape. We assume that the outer surface of a magnet in a PMSM can be modeled as one part of a cylinder. Using an ANSOFT model, we optimized the radius of the magnet with respect to number of poles, rotor size, and... View full abstract»

• ### Design and Test of an Axial Flux Permanent-Magnet Machine With Field Control Capability

Publication Year: 2008, Page(s):2168 - 2173
Cited by:  Papers (24)
| | PDF (667 KB) | HTML

We designed and tested a new axial flux permanent-magnet machine (AFPM) with field weakening capability. This paper provides a summary of key design features, optimization, and test results of an AFPM prototype. The proposed field weakening method is based on the control of the d-axis component of the armature reaction flux. The paper focuses on the air-gap flux control capability of the topology. View full abstract»

• ### Principle of Operation and Feature Investigation of a New Topology of Hybrid Excitation Synchronous Machine

Publication Year: 2008, Page(s):2174 - 2180
Cited by:  Papers (53)
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We present a new topology of hybrid excitation synchronous machine (HESM) and describe operational principles and features of the new configuration. Using the radial/axial distribution of the magnetic field, we develop an equivalent magnetic circuit model. We obtain magnetic flux, flux density, and induced voltage with various electrical magnetomotive forces by calculating the nonlinear magnetic c... View full abstract»

• ### Analytical Force Determination in an Electromagnetic Actuator

Publication Year: 2008, Page(s):2181 - 2185
Cited by:  Papers (6)
| | PDF (275 KB) | HTML

We present an original analytical determination of the force acting on the moving coil in an electromagnetic actuator. The actuator magnetic field is solved analytically by Schwarz-Christoffel (SC) mapping. The SC integral is solved analytically using the elliptic functions. We verified the results by finite-element methods. View full abstract»

• ### Modeling of a Switched Reluctance Machine Based on the Invertible Torque Function

Publication Year: 2008, Page(s):2186 - 2194
Cited by:  Papers (9)
| | PDF (490 KB) | HTML

This paper presents a switched reluctance machine model based on an invertible expression representing the torque-phase current relationship. The model can be useful for real-time control in high-performance applications when the command current is derived from the torque command. The two angular functions that the model requires as input can easily be calculated from the known static torque-posit... View full abstract»

• ### Demagnetization Assessment for Three-Phase Tubular Brushless Permanent-Magnet Machines

Publication Year: 2008, Page(s):2195 - 2203
Cited by:  Papers (37)
| | PDF (1509 KB) | HTML

We describe an analytical technique for assessing the risk of partial demagnetization in tubular permanent-magnet (PM) machines. The technique establishes analytical expressions for the open-circuit and armature reaction fields in the cylindrical coordinate system and superposes the fields in the permanent-magnet regions to determine the extent to which the magnets may be partially irreversibly de... View full abstract»

• ### A Vibration-Based Condition Monitoring System for Switched Reluctance Machine Rotor Eccentricity Detection

Publication Year: 2008, Page(s):2204 - 2214
Cited by:  Papers (29)
| | PDF (1977 KB) | HTML

We propose a condition monitoring strategy for the detection of rotor eccentricity in switched reluctance machines. It uses vibration measurements and harmonic analysis to generate a Fourier series for the vibrations. Assessment of the change in key vibration components allows development of an eccentricity index that can give an indication of increasing eccentricity. The method discriminates betw... View full abstract»

• ### A Novel Parametric Model for AC Contactors

Publication Year: 2008, Page(s):2215 - 2218
Cited by:  Papers (16)
| | PDF (288 KB) | HTML

This paper develops a robust and fast parametric model to describe the dynamic behavior of an ac contactor. The model solves simultaneously the mechanical and electromagnetic coupled differential equations that govern its dynamic response. It deals with the shading rings and takes into account the fringing flux. Data from simulations carried out by applying the presented parametric model are compa... View full abstract»

• ### Efficient Modeling of Magnetostrictive Media Using Fuzzy Inference Systems

Publication Year: 2008, Page(s):2219 - 2226
Cited by:  Papers (1)
| | PDF (533 KB) | HTML

Magnetic materials exhibiting giant magnetostriction, such as Terfenol, are currently widely used in fine positioning and active vibration damping devices. Obviously, using accurate magnetostriction simulation models during the various design stages of those devices can positively contribute to the enhancement of their precision. This paper presents an efficient approach, based on fuzzy inference ... View full abstract»

• ### Servo Control Design for a High TPI Servo Track Writer With Microactuators

Publication Year: 2008, Page(s):2227 - 2234
Cited by:  Papers (3)
| | PDF (1304 KB) | HTML

This paper proposes modifications to enhance the original generalized Kalman-Yakubovic-Popov (G-KYP) lemma-based sensitivity function shaping technique that Q-parameterizes the controller and solves for the desired finite impulse response filter Q(z) using linear matrix inequalities (LMI) optimization. By representing Q(z) with an infinite impulse response filter and including an extra LMI that is... View full abstract»

• ### Low-Density Parity-Check Coded Recording Systems With Run-Length-Limited Constraints

Publication Year: 2008, Page(s):2235 - 2242
Cited by:  Papers (4)
| | PDF (291 KB) | HTML

We propose two techniques for the low-density parity-check (LDPC) coded partial response channel with run-length-limited (RLL) constraints. The first is a modification of the selective flipping technique so that side information is not needed. The second is based on the estimation of flipped bits for the selective flipping technique. The second technique can achieve significant performance improve... 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