# IEEE Transactions on Magnetics

## Filter Results

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

Publication Year: 2009, Page(s): C1
| PDF (142 KB)
• ### IEEE Transactions on Magnetics publication information

Publication Year: 2009, Page(s): C2
| PDF (39 KB)

Publication Year: 2009, Page(s):3213 - 3214
| PDF (64 KB)
• ### Unusual Effects Measured Under DC Bias Conditions on MnZn Ferrite Material

Publication Year: 2009, Page(s):3215 - 3222
Cited by:  Papers (6)
| | PDF (672 KB) | HTML

Switch mode power supplies are the predominant form through which power conversion is currently implemented in electronic equipment. Within such power supplies, ferrite cored magnetic components are commonly placed under dc bias conditions which, due to magnetomechanical effects, can result in higher than expected core losses. This paper presents measurements that show the impact of magnetomechani... View full abstract»

• ### Influences of Extra Magnets on Giant Magnetoimpedance Effect in Amorphous Wires

Publication Year: 2009, Page(s):3223 - 3227
Cited by:  Papers (1)
| | PDF (546 KB) | HTML

Adjacent extra magnets can induce an additional impedance to an amorphous wire. We have studied the additional impedance passing through a magnetic ring and found that it is related to the electromagnetic characteristics, shapes, and locations of the extra magnet and the frequency of the ac excitation, regardless of the amorphous material properties and the extra magnetic field conditions. Accordi... View full abstract»

• ### Theoretical Description of the High-Frequency Magnetic Force Microscopy Technique

Publication Year: 2009, Page(s):3228 - 3232
Cited by:  Papers (4)
| | PDF (262 KB) | HTML

We present a theoretical description of the high-frequency magnetic force microscopy (HF-MFM) technique. There are currently two operation modes: 1) the measurement of high-frequency currents via their magnetic stray fields and 2) the measurement of stray fields emanating from hard disk writer poles. The advanced HF-MFM technique employs the amplitude-modulation technique in order to convert the H... View full abstract»

• ### Modeling the 3-D Rotational and Translational Motion of a Halbach Rotor Above a Split-Sheet Guideway

Publication Year: 2009, Page(s):3233 - 3242
Cited by:  Papers (10)
| | PDF (1714 KB) | HTML

When a Halbach rotor is simultaneously rotated and translationally moved above a split-sheet aluminum guideway a traveling time-varying magnetic field is created in the air gap. This field induces eddy currents in the guideway that can simultaneously create suspension and propulsion forces. If the rotor is offset from the center then a re-centering guidance force can also be created. As the forces... View full abstract»

• ### Ferroresonance Analysis in LCR Circuits Including Rapidly Solidified Alloy Cores

Publication Year: 2009, Page(s):3243 - 3250
Cited by:  Papers (5)
| | PDF (491 KB) | HTML

We report an experimental and modeling analysis of ferroresonance phenomena in a series inductance-capacitance-resistance circuit with a saturable inductor. The nonlinear reactor core is made of a nanocrystalline ribbon whose magnetic properties can be modified by suitable thermal treatments. This choice of core allows us to investigate the influence of the magnetization curve on the evolution of ... View full abstract»

• ### Theoretical Analysis of AC Resistance in Coil Using Magnetoplated Wire

Publication Year: 2009, Page(s):3251 - 3259
Cited by:  Papers (15)  |  Patents (1)
| | PDF (406 KB) | HTML

In this paper, we describe the ac resistance of a coil using a magnetoplated wire (MPW), which is prepared by circumferentially plating a copper wire with magnetic thin film. The Q value of the MPW coil is higher than that of a coil using a copper wire without magnetic thin film plating (COW coil). High-Q coils have lower loss and are required in various industrial fields. To further... View full abstract»

• ### A Stable SPICE Macro-Model for Magnetic Tunnel Junctions for Applications in Memory and Logic Circuits

Publication Year: 2009, Page(s):3260 - 3268
Cited by:  Papers (8)
| | PDF (634 KB) | HTML

A generalized circuit macro-model has been developed representing field-switchable magnetic tunnel junctions (MTJs) characterized by two distinct voltage-dependent resistance values in parallel and antiparallel states. General-purpose subcircuit implementations are designed for a switchable voltage-dependent resistor capable of implementing using any version of SPICE, and thus the users are not re... View full abstract»

• ### Comparison of Alternative Techniques for Characterizing Magnetostriction and Inverse Magnetostriction in Magnetic Thin Films

Publication Year: 2009, Page(s):3269 - 3273
Cited by:  Papers (8)
| | PDF (502 KB) | HTML

We compare the direct and inverse techniques of measuring magnetostriction in magnetic thin films. We chose a set of four magnetic thin film samples (Co95Fe5, Co60Fe20B20, Ni65Fe15Co20, and Ni80Fe20) for the measurements, representing positive and negative magnetostriction and having satur... View full abstract»

• ### Apparatus for Magnetization and Efficient Demagnetization of Soft Magnetic Materials

Publication Year: 2009, Page(s):3274 - 3283
Cited by:  Papers (10)
| | PDF (479 KB) | HTML

This paper describes an electrical circuit that can be used to automatically magnetize and ac-demagnetize moderately soft magnetic materials and with minor modifications could be used to demagnetize harder magnetic materials and magnetic geological samples. The circuit is straightforward to replicate, easy to use, and low in cost. Independent control of the demagnetizing current frequency, amplitu... View full abstract»

• ### Demagnetization Testing for a Mixed-Grade Dovetail Permanent-Magnet Machine

Publication Year: 2009, Page(s):3284 - 3289
Cited by:  Papers (12)
| | PDF (1249 KB) | HTML

A dovetail machine is a novel design developed to solve the strength problems of traditional buried magnet machines. A mixed-grade construction can be easily applied to a dovetail machine, because a dovetail machine has several magnets in a single pole in different positions. The basic idea of the mixed-grade construction is to use high intrinsic coercivity material in the positions of the high de... View full abstract»

• ### Fault Analysis and Parameter Identification of Permanent-Magnet Motors by the Finite-Element Method

Publication Year: 2009, Page(s):3290 - 3295
Cited by:  Papers (38)
| | PDF (823 KB) | HTML

We performed a time-stepping finite-element-method (FEM) analysis to study a rotor surface-mounted permanent-magnet synchronous machine with insulation failure inter-turn fault. We used FEM for magnetic field study and determining the machine parameters under various fault conditions. We studied the effect of machine pole number and number of faulted turns on machine parameters. Finally, we used t... View full abstract»

• ### Analytical Prediction of Cogging Torque in Surface-Mounted Permanent-Magnet Motors

Publication Year: 2009, Page(s):3296 - 3302
Cited by:  Papers (17)
| | PDF (873 KB) | HTML

We present a new approach to computing cogging torque based on only one analytical field solution in surface-mounted permanent-magnet (PM) motors. We use conformal transformation to compute the magnetic field created by the permanent magnets in the air gap with a single slot. Then, we derive the cogging torque due to the single-slot effect at different rotor positions directly from the 2-D analyti... View full abstract»

• ### A General Model for Investigating the Effects of the Frequency Converter on the Magnetic Iron Losses of a Squirrel-Cage Induction Motor

Publication Year: 2009, Page(s):3303 - 3315
Cited by:  Papers (44)
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We present a comprehensive analysis of iron losses in an inverter-fed induction motor. We performed experimental and numerical investigations to assess the additional losses produced by a pulsewidth modulated (PWM) supply compared to a sinusoidal supply. We developed an iron-loss model, called the hybrid model, and incorporated it into a two-dimensional (2-D) finite-element method (FEM) to investi... View full abstract»

• ### General Analytical Models of Inductance Matrices of Four-Pole Bearingless Motors With Two-Pole Controlling Windings

Publication Year: 2009, Page(s):3316 - 3321
Cited by:  Papers (13)
| | PDF (170 KB) | HTML

In this paper, after introducing the bearingless motor's working principle in brief, we analyze the magnetic field distribution principle of the bearingless motor. We then derive in detail the general analytical models of inductance matrices of a four-pole bearingless motor with two-pole controlling windings. The derived general analytical models are applicable not only to bearingless motors with ... View full abstract»

• ### A Sliding Mode Flux-Linkage Controller With Integral Compensation for Switched Reluctance Motor

Publication Year: 2009, Page(s):3322 - 3328
Cited by:  Papers (13)
| | PDF (363 KB) | HTML

A novel flux-linkage controller using sliding mode technique with integral compensation (SM-I) is proposed for torque ripple minimization of a switched reluctance motor (SRM). The proposed SM-I controller inherits the advantages of proportion-integration (PI) and conventional SM controller. These make it feasible for the flux-linkage controller to reduce torque ripple by correctly selecting the fl... View full abstract»

• ### Comparison of the ${mbi A}^{*}{-}{mbi A}$ and ${mbi T}, Phi{-}Phi$ Formulations for the 2-D Analysis of Solid-Rotor Induction Machines

Publication Year: 2009, Page(s):3329 - 3333
Cited by:  Papers (5)
| | PDF (304 KB) | HTML

We present two eddy-current field potential formulations to solve rotating electrical machine problems by applying the finite-element method (FEM) using the motional A *- A-potential formulation and the motional T, Phi-Phi-potential formulation. We use the single-phase and three-phase solid-rotor induction motors of Problem No. 30a of TEAM Workshops to compare the p... View full abstract»

• ### Force and Stiffness of Passive Magnetic Bearings Using Permanent Magnets. Part 2: Radial Magnetization

Publication Year: 2009, Page(s):3334 - 3342
Cited by:  Papers (41)
| | PDF (362 KB) | HTML

This paper deals with the calculation of the force and the stiffness between two ring permanent magnets whose polarization is radial. Such a configuration corresponds to a passive magnetic bearing. The magnetic force exerted between ring permanent magnets is determined by using the Coulombian model. The expressions obtained are semianalytical and we show that it is not possible to find an exact an... View full abstract»

• ### Matrix Analysis of 2-D Eddy-Current Magnetic Fields

Publication Year: 2009, Page(s):3343 - 3350
Cited by:  Papers (6)
| | PDF (326 KB) | HTML

We present an accurate equivalent circuit model to represent a 2-D eddy-current magnetic field. The magnetic field can be coupled with stranded windings and solid conductors. For use in developing formulations of impedance computation, we present two systematic matrix analysis methods based on the system equations, one using the loop method and the other using the nodal method. In the model, each ... View full abstract»

• ### Real-Time Tumor Tracking for Four-Dimensional Computed Tomography Using SQUID Magnetometers

Publication Year: 2009, Page(s):3351 - 3361
Cited by:  Papers (9)
| | PDF (1569 KB) | HTML

We present a method for real-time tumor tracking in external beam radiotherapy using superconducting quantum interference device (SQUID) magnetometers. The objective is to develop a localization algorithm and determine a cost effective sensor configuration that is capable of long-range localization, ~1000 mm, with an accuracy of 1-2 mm. We developed several algorithms to calculate the location of ... View full abstract»

• ### A Linear Matrix Inequality Approach to Initial Value Compensation for Mode Switching Control in Hard Disk Drive Servo Systems

Publication Year: 2009, Page(s):3362 - 3364
Cited by:  Papers (4)
| | PDF (176 KB) | HTML

In switching from the track-seeking or track-jumping control mode to the track-following control mode in hard disk drives, initial values of the feedback controller are tuned such that the transient response is improved. We present a simple initial value compensation (IVC) method using linear matrix inequalities (LMIs) instead of the conventional method that uses a Lyapunov equation. The LMIs incl... View full abstract»

• ### Correction to “Influence of the Si Substrate on the Transport and Magnetotransport Properties of Nanostructured Fe-Ag Thin Films” [Nov 09 2784-2787]

Publication Year: 2009, Page(s): 3365
| | PDF (96 KB) | HTML

In the above titled paper (ibid., vol. 44, no. 11. pp. 2784-2787, Nov. 08), there were some errors in the first two figures. Corrections are presented here. View full abstract»

• ### Correction to "Evolution of Stress With Film Thickness in Co Films on InP(001)"

Publication Year: 2009, Page(s): 3366
| PDF (25 KB) | HTML

## 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