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# IEEE Transactions on Magnetics

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Displaying Results 1 - 25 of 30
• ### [Front cover]

Publication Year: 2008, Page(s): C1
| PDF (200 KB)
• ### IEEE Transactions on Magnetics publication information

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

Publication Year: 2008, Page(s):2245 - 2246
| PDF (56 KB)
• ### Structure and Magnetic Properties of Sn$_{1 - {rm x}}$ Co$_{rm x}$ O$_{2}$ Powder and Film

Publication Year: 2008, Page(s):2247 - 2251
Cited by:  Papers (1)
| | PDF (785 KB) | HTML

We have studied room-temperature ferromagnetism (RTFM) in Sn1 - xCoxO2 powders and films fabricated by the sol-gel method. Our X-ray diffraction, high-resolution transmission microscopy, and X-ray photoelectron spectroscopy results show that all the samples have a pure rutile structure, and Co ions have a chemical valence of 2+. In addition, t... View full abstract»

• ### Perpendicular GMI Effect in Meander NiFe and NiFe/Cu/NiFe Film

Publication Year: 2008, Page(s):2252 - 2254
Cited by:  Papers (3)
| | PDF (378 KB) | HTML

We have evaluated the perpendicular giant magnetoimpedance effect (GMI) in both NiFe and NiFe/Cu/NiFe films with meander geometry in the >1 MHz high-frequency range. With the magnetic field, the perpendicular GMI effect shows an intense GMI peak value at a certain field. This effect is comparable to the longitudinal GMI effect in both profile and peak value amplitude. The experimental results c... View full abstract»

• ### Microwave Reflection Characteristics of Co$_{2}$Z Barium Ferrite Composites With Various Volume Concentration

Publication Year: 2008, Page(s):2255 - 2261
Cited by:  Papers (56)
| | PDF (460 KB) | HTML

We have measured the complex permeability and permittivity spectra of Co2Z/epoxy composites for different volume concentrations Vc varying from 0.2 to 0.6. The effects of Vc on matching and bandwidth properties have been studied. For Vc ges 0.5, there exist two matching points. The first matching, occurring away from the magnetic resonance region, has it... View full abstract»

• ### A Model for the Forward Problem in Magnetic Induction Tomography Using Boundary Integral Equations

Publication Year: 2008, Page(s):2262 - 2267
Cited by:  Papers (24)
| | PDF (371 KB) | HTML

We propose a new formulation for the forward problem in magnetic induction tomography (MIT). We formulate the problem in terms of interior and exterior boundary integral equations (BIEs), subject to appropriate boundary conditions. We then transform a standard exterior BIE involving the magnetic vector potential to a BIE involving the electric fields. This transformation eliminates two boundary co... View full abstract»

• ### Computation of 3-D Sensitivity Coefficients in Magnetic Induction Tomography Using Boundary Integral Equations and Radial Basis Functions

Publication Year: 2008, Page(s):2268 - 2276
Cited by:  Papers (2)
| | PDF (789 KB) | HTML

This paper presents a method for the numerical computation of 3-D sensitivity coefficients of a target object in magnetic induction tomography (MIT). The sensitivity coefficient at a point is defined as the dot product of electromagnetic fields produced by unit current flowing in the excitation and the detector coil. In this paper, the fields are governed by a set of boundary integral equations (B... View full abstract»

• ### Representing Elongated Magnetic Sources by Prolate Spheroidal Harmonics Developed on an Optimized Coordinate System

Publication Year: 2008, Page(s):2277 - 2282
| | PDF (461 KB) | HTML

A method is suggested for obtaining a compact and accurate representation of elongated magnetic sources by a series expansion of prolate spheroidal harmonics. While the general solution involves an infinite series of harmonics, practical measurement grids only support discrimination of a limited number of harmonics. In this paper, we present a method for minimizing the errors introduced when termi... View full abstract»

• ### Computer-Aided Simulation Analysis of a Novel Structure Hybrid Magnetic Bearing

Publication Year: 2008, Page(s):2283 - 2287
Cited by:  Papers (11)
| | PDF (636 KB) | HTML

We present a hybrid magnetic bearing based on a novel structure. The X and Y magnetic fields of the bearing are independent of each other, which decreases the magnetic field coupling of the two dimensions significantly. An external rotor structure is designed into the magnetic bearing. We discuss the working principle of the magnetic bearing and derive its mathematical model. Our computer-aided si... View full abstract»

• ### Meshless Radial Basis Function Method for Transient Electromagnetic Computations

Publication Year: 2008, Page(s):2288 - 2295
Cited by:  Papers (49)
| | PDF (900 KB) | HTML

We propose a novel numerical method to simulate transient electromagnetic problems. The time derivatives are still tackled with the customary explicit leapfrog time scheme. But in the space domain, the fields at the collocation points are expanded into a series of radial basis functions and are treated with a meshless method procedure. Our method solves numerically Maxwell's equations with various... View full abstract»

• ### Magnetic Force Microscopy of Low-Coercivity Ferromagnetic Nanodiscs

Publication Year: 2008, Page(s):2296 - 2298
Cited by:  Papers (3)
| | PDF (476 KB) | HTML

We report the results of magnetic force microscopy (MFM) investigations of low-coercivity Co nanodiscs, with 50 nm lateral size and 20 nm height, fabricated by e-beam lithography and ion etching. We observed two types of MFM contrast in the form of Gaussian and ring distributions caused by strong probe-particle interaction. We compared experimentally the transformation of the MFM contrast from the... View full abstract»

• ### Improved Analytical Model of a Permanent-Magnet Brushless DC Motor

Publication Year: 2008, Page(s):2299 - 2309
Cited by:  Papers (26)
| | PDF (1340 KB) | HTML

In this paper, we develop a comprehensive model of a permanent-magnet brushless DC (BLDC) motor. An analytical model for determining instantaneous air-gap field density is developed. This instantaneous field distribution can be further used to determine the cogging torque, induced back electromotive force, and iron losses in the motor. The advantage of analytical models is that they can be readily... View full abstract»

• ### Performance Assessment of Air-Core Linear Permanent-Magnet Synchronous Motors

Publication Year: 2008, Page(s):2310 - 2316
Cited by:  Papers (7)
| | PDF (405 KB) | HTML

Performance assessment is crucial during the motor design process as a basis for comparison between different candidate designs. The objective of this paper is to determine how quickly an air-core linear permanent-magnet synchronous motor can perform a point-to-point positioning task while not exceeding a given limit on allowable average power dissipation. The magnetic field in the air gap is obta... View full abstract»

• ### Properties of Cogging Torque, Starting Torque, and Electrical Circuits for the Single-Phase Brushless DC Motor

Publication Year: 2008, Page(s):2317 - 2323
Cited by:  Papers (20)
| | PDF (1129 KB) | HTML

A single-phase brushless dc motor requires an asymmetric air gap to eliminate the dead point where the excitation net torque is zero. In this paper, we use the finite-element method (FEM) to analyze the properties of cogging torque, starting torque, and electrical circuits. Others have discussed the influences of various asymmetric air gaps on these properties. However, the optimum asymmetric air-... View full abstract»

• ### Inductance Calculations of Permanent-Magnet Synchronous Machines Including Flux Change and Self- and Cross-Saturations

Publication Year: 2008, Page(s):2324 - 2331
Cited by:  Papers (55)
| | PDF (338 KB) | HTML

Accurate inductance calculation of permanent-magnet synchronous machines is a relevant topic, since the inductances determine a large part of the electrical machine behavior. However, the inductance calculation, as well as the inductance measurement, is never a completely straightforward task when saturation occurs. In this paper, the total flux in the d and q axes are obtained from finite- elemen... View full abstract»

• ### Object-Oriented Knowledge-Based System for Distribution Transformer Design

Publication Year: 2008, Page(s):2332 - 2337
Cited by:  Papers (12)
| | PDF (2271 KB) | HTML

The first stage in any machine design process involves a substantial heuristic exercise to select the machine best suited to a set of specifications. The second stage obtains the dimensions of a selected machine and a design that satisfies specifications. The final stage usually involves optimization and the finite-element method. We present an object-oriented knowledge-based system for distributi... View full abstract»

• ### Sup-Resonant Response of a Nonautonomous Maglev System With Delayed Acceleration Feedback Control

Publication Year: 2008, Page(s):2338 - 2350
Cited by:  Papers (10)
| | PDF (459 KB) | HTML

A Maglev system with delayed acceleration feedback control is disturbed by the deflection of flexible guideway, and resonant response may take place. We have investigated sup-resonant response of the Maglev system by employing center manifold reduction and the method of multiple scales. We present the dynamic model and expand it to a third-order Taylor series. Taking time delay as its bifurcation ... View full abstract»

• ### Design Concepts of Optimized MRI Magnet

Publication Year: 2008, Page(s):2351 - 2360
Cited by:  Papers (12)
| | PDF (592 KB) | HTML

This paper describes a simple technique to design compact air core magnets for magnetic resonance imaging (MRI). The optimum geometry is obtained by a combination of analytical and numerical methods. The technique emphasizes achieving the required field homogeneity with a shorter magnet having a minimum amount of ampere turns. The code calculates the total inductance of the set of coils, total con... View full abstract»

• ### Design of a Halbach Magnet Array Based on Optimization Techniques

Publication Year: 2008, Page(s):2361 - 2366
Cited by:  Papers (45)  |  Patents (2)
| | PDF (880 KB) | HTML

We have designed a Halbach magnet array by using a numerical optimization method based on finite-element analysis. The magnetization direction of each element is defined as the design variable. The optimal magnet arrays composed of two and three linear magnet layers can then be investigated to increase the attractive, repulsive, and tangential magnetic forces between magnet layers. We have applied... View full abstract»

• ### A Novel Method of Arraying Permanent Magnets Circumferentially to Generate a Rotation Magnetic Field

Publication Year: 2008, Page(s):2367 - 2372
Cited by:  Papers (1)
| | PDF (837 KB) | HTML

An outer magnetic field is extensively applied to drive the movement of a clinic micro-robot. However, how to produce a suitable magnetic field is a complicated problem. Commonly, the drive magnetic field is generated by a combination of power coils. This paper presents a novel method that circumferentially arrays identical permanent magnets to generate a rotational magnetic field in the center ar... View full abstract»

• ### Topology Design Optimization of a Magnetostrictive Patch for Maximizing Elastic Wave Transduction in Waveguides

Publication Year: 2008, Page(s):2373 - 2380
Cited by:  Papers (10)
| | PDF (1086 KB) | HTML

We present a method for formulating the design problem of maximizing the transduction efficiency of a magnetostrictive patch-type transducer as a topology optimization problem. Unlike existing methods based on magnetic analysis alone, our method is based on a coupled magnetomechanical analysis. It employs a quasi-static magnetomechanical transduction model relating applied magnetic field and induc... View full abstract»

• ### Design Procedure for Hysteresis Couplers

Publication Year: 2008, Page(s):2381 - 2395
Cited by:  Papers (1)
| | PDF (2499 KB) | HTML

The present paper is devoted to the description of a procedure for the design of rotational hysteresis couplers for customer applications. The analysis has been oriented towards configurations characterized by high reliability and adaptability to the operating conditions. The tradeoff analysis leads to a claw pole configuration powered by an electromagnet in tandem with a permanent magnet to allow... View full abstract»

• ### High-Frequency Fringing Fields Loss in Thick Rectangular and Round Wire Windings

Publication Year: 2008, Page(s):2396 - 2401
Cited by:  Papers (6)
| | PDF (533 KB) | HTML

This paper examines high-frequency losses of thick rectangular and round wire windings due to the fringing fields of an air-gap. It derives formulas for the losses and validates them numerically using the 2-D finite-element method (FEM). It also provides a procedure for including the effect of self and proximity fields in the loss calculations, using the principle of superposition and a one-dimens... View full abstract»

• ### Modeling and Prototyping of a Flux Concentrator for Positron Capture

Publication Year: 2008, Page(s):2402 - 2408
Cited by:  Papers (1)
| | PDF (847 KB) | HTML

An adiabatic matching device (AMD) generates a tapered high-strength magnetic field to capture positrons emitted from a positron target to a downstream accelerating structure. The AMD is a key component of a positron source and represents a technical challenge. The International Linear Collider collaboration is proposing to employ a pulsed, normal-conducting, flux-concentrator to generate a 5 Tesl... 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