# IEEE Transactions on Magnetics

## Volume 49 Issue 3  Part 2 • March 2013

This issue contains several parts.Go to:  Part 1

## Filter Results

Displaying Results 1 - 25 of 37
• ### [Front cover]

Publication Year: 2013, Page(s): C1
| PDF (187 KB)
• ### IEEE Transactions on Magnetics publication information

Publication Year: 2013, Page(s): C2
| PDF (196 KB)

Publication Year: 2013, Page(s):1069 - 1071
| PDF (167 KB)
• ### A Consistency Condition for the Vector Potential in Multiply-Connected Domains

Publication Year: 2013, Page(s):1072 - 1076
Cited by:  Papers (2)
| | PDF (911 KB) | HTML

A classical problem in electromagnetics concerns the representation of the electric and magnetic fields in the low-frequency or static regime, where topology plays a fundamental role. For multiply-connected conductors, at zero frequency, the standard boundary conditions on the tangential components of the magnetic field do not uniquely determine the vector potential. We describe a (gauge-invariant... View full abstract»

• ### Magnetic Domain Structure in Coupled Rectangular Nanostructures

Publication Year: 2013, Page(s):1077 - 1081
Cited by:  Papers (2)
| | PDF (596 KB) | HTML

The coupling of rectangular magnetic 2000×1000×20 nm3 structures with flux-closure domain configurations is studied using micromagnetic simulations with periodic boundary conditions. In order to understand the origin of the interaction, the magnetic structure of a single element is analyzed in detail to calculate its magnetostatic fringe field. Both, our simulations as wel... View full abstract»

• ### High Bandwidth Control Design and Implementation for a Dual-Stage Actuation System With a Microthermal Actuator

Publication Year: 2013, Page(s):1082 - 1087
Cited by:  Papers (7)
| | PDF (1338 KB) | HTML

This paper is devoted to the control design and implementation of the dual-stage actuation system with a newly developed microthermal actuator (MTA) as the secondary actuator. The characterization and modeling of this new MTA is presented for controller design. Its performances such as stroke, time constant, and a good linearity are exhibited. The controller design of the MTA-based dual-stage actu... View full abstract»

• ### Active Control of Flow-Induced Vibrations on Slider in Hard Disk Drives by Suppressing Pressure Fluctuations With Virtual Sensing

Publication Year: 2013, Page(s):1088 - 1095
Cited by:  Papers (5)
| | PDF (1884 KB) | HTML

This paper presents numerical simulations on a feedback active control strategy for flow-induced off-track vibration of a head gimbals assembly (HGA) bearing a slider in hard disk drives (HDDs). In the proposed active control strategy, a physical pressure sensor is assumed on the HDD cover to detect the pressure fluctuations and a pressure actuator is on the inner surface of the HDD cover to actua... View full abstract»

• ### The Effect of Coil Modeling on the Predicted Induced Electric Field Distribution During TMS

Publication Year: 2013, Page(s):1096 - 1100
Cited by:  Papers (4)
| | PDF (704 KB) | HTML

We investigated the effect on the predicted induced field inside the head tissues of the numerical model adopted for simulating the excitation coil during transcranial magnetic stimulation (TMS). A commercially available eight-shaped coil was modeled in four different ways. The electric field inside a detailed (2 mm resolution) and anatomically realistic numerical phantom of the human head was cal... View full abstract»

• ### A Fast Analysis Technique for Electromagnetic Interaction of High-Frequency AC Current-Carrying Wires With Arbitrary-Shape Cracks in Ferrous Metals

Publication Year: 2013, Page(s):1101 - 1107
Cited by:  Papers (4)
| | PDF (1179 KB) | HTML

The paper proposes a fast and accurate modeling technique for calculating the electromagnetic fields around a planar surface crack with arbitrary depth profile in a ferromagnetic metal, induced by a high-frequency ac current-carrying wire of arbitrary shape. The proposed technique first reduces the governing 3-D problem into two new equivalent 2-D electrostatic Dirichlet problems. Then, the method... View full abstract»

• ### Field Distributions Around a Rectangular Crack in a Metallic Half-Space Excited by Long Current-Carrying Wires With Arbitrary Frequency

Publication Year: 2013, Page(s):1108 - 1118
| | PDF (3307 KB) | HTML

In this paper, we propose a semianalytical solution for evaluation of field distributions around a short rectangular crack in a metallic half-space excited by long current-carrying wires with arbitrary frequency. The governing Helmholtz equation is solved in three dimensions by separation of variables. The solution is obtained by developing 2-D Fourier series model and using exponential functions ... View full abstract»

• ### Decoupling the Influence of Permeability and Conductivity in Pulsed Eddy-Current Measurements

Publication Year: 2013, Page(s):1119 - 1127
Cited by:  Papers (23)
| | PDF (1686 KB) | HTML

Eddy-current (EC) sensors are widely used in the industry for nondestructive evaluation (NDE) and structural health monitoring (SHM). It has this wide acceptance mainly because it has high tolerance to harsh environments, low cost, and high bandwidth. Its variant pulsed eddy current (PEC) provides even more depth information of test materials, which can be applied in liftoff measurement (displacem... View full abstract»

• ### Simulation of Magnetic Field Abnormalities Caused by Stress Concentrations

Publication Year: 2013, Page(s):1128 - 1134
Cited by:  Papers (3)
| | PDF (1044 KB) | HTML

Stress concentration is a major cause of metal structure failures. In ferromagnetic materials, it changes the nearby magnetic field. This phenomenon has been used to test stress concentrations. However, magnetic field changes caused by stress concentrations are complicated; therefore obtaining detailed stress information from magnetic fields or even evaluating the impact of stress is difficult. Th... View full abstract»

• ### Analytical Solutions for the Self- and Mutual Inductances of Concentric Coplanar Disk Coils

Publication Year: 2013, Page(s):1135 - 1142
Cited by:  Papers (8)
| | PDF (2190 KB) | HTML

In this paper, closed-form solutions are presented for the self- and mutual inductances of disk coils which lie concentrically in a plane. The solutions are given as generalized hypergeometric functions which are closely related to elliptic integrals. The method used is a Legendre polynomial expansion of the inductance integral, which renders all integrations straightforward. Excellent numerical a... View full abstract»

• ### An Experimental-Computational Technique for Evaluating Magnetic Field Distributions Around Unknown Sources

Publication Year: 2013, Page(s):1143 - 1148
Cited by:  Papers (3)
| | PDF (985 KB) | HTML

This paper proposes a hybrid experimental-numerical technique, based on the boundary element method, able to reconstruct the magnetic field distribution in the free space outside the unknown field sources, without requiring the onerous process of source identification. The approach is validated by comparison with experimental data considering a Helmholtz coil system, where the connections of the c... View full abstract»

• ### Structure Properties of the ${rm YFe}_{11}{rm Mo}$ Intermetallic Compound

Publication Year: 2013, Page(s):1149 - 1152
Cited by:  Papers (1)
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The structure, chemistry and magnetic domain configurations of YFe11Mo polycrystalline aggregates have been investigated by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy and Lorentz microscopy. Although extensive reports on the magnetic properties of this compound can be found in the literature, its exact equilibrium structure remains elusive.... View full abstract»

• ### Simulating the Trapped B Field in Bulk Superconductors Using a Mutual Inductance Coupling Technique

Publication Year: 2013, Page(s):1153 - 1158
Cited by:  Papers (4)  |  Patents (1)
| | PDF (1284 KB) | HTML

The field and current induced in a trapped field magnet during a transient current excitation is complicated by the fact that the conductivity of the material changes wildly depending on both the magnitude of the induced current and the local B field. A mutual inductance approach is presented for solving this coupled problem; it involves discretizing the bulk superconductor into cells and precompu... View full abstract»

• ### Utilizing Materials With Controllable Curie Temperatures for Magnetic Actuation Purposes

Publication Year: 2013, Page(s):1159 - 1162
| | PDF (599 KB) | HTML

The magnetic force between a permanent magnet and different blocks of ferromagnetic materials was measured and calculated as a function of distance and temperature in the vicinity of the Curie temperature of the materials. The calculations were carried out using a 3-D finite-element model of the system. On the basis of forces predicted by the model a number of equilibrium points were calculated fo... View full abstract»

• ### Microwave Power Absorption Characteristics of Ferrites

Publication Year: 2013, Page(s):1163 - 1166
Cited by:  Papers (19)
| | PDF (952 KB) | HTML

The microwave power absorption characteristics of five ferrites, BaFe12O19, SrFe12O19, CuFe2O 4, CuZnFe4O4 and NiZnFe4O4, have been studied by determining the average power absorption patterns of the ferrite slabs using the derived power equations with consideration of both microwave diele... View full abstract»

• ### Magnetostatic Interaction Investigation of CoFe Alloy Nanowires by First-Order Reversal-Curve Diagrams

Publication Year: 2013, Page(s):1167 - 1171
Cited by:  Papers (14)
| | PDF (1444 KB) | HTML

Magnetic CoFe alloy nanowires were alternating current (ac)-pulse electrodeposited into the nanopores of hard anodized aluminum oxide templates. The effect of nanowires lengths on the magnetostatic interactions was investigated using first-order reversal-curve (FORC) method. FORC diagrams obtained from nanowire arrays with different lengths show drastic improvement in magnetic properties with decr... View full abstract»

• ### Mn-Zn Ferrite Round Cable EMI Suppressor With Deep Grooves and a Secondary Short Circuit for Different Frequency Ranges

Publication Year: 2013, Page(s):1172 - 1177
Cited by:  Papers (2)
| | PDF (1306 KB) | HTML

A novel Mn-Zn ferrite round cable electromagnetic interference (EMI) suppressor with deep grooves and a secondary short circuit was constructed, realized and measured. Three steps were passed in novel suppressor development: from developing a suitable magnetic material, to constructing a suppressor device, to forming a new class of possible applications. Soft ferrite feedstock was formed from fine... View full abstract»

• ### Lumped-Parameter Thermal Model for Axial Flux Permanent Magnet Machines

Publication Year: 2013, Page(s):1178 - 1184
Cited by:  Papers (30)
| | PDF (1059 KB) | HTML

A lumped-parameter thermal model is presented for axial flux permanent magnet (AFPM) machines. The model provides the steady-state thermal solution to derive the temperatures at different parts of the machine, including the temperatures in the stator windings and the temperature of the magnets. Temperature-dependent thermal properties of the materials used in the machine construction as well as th... View full abstract»

• ### Demagnetization Fault Diagnosis in Surface Mounted Permanent Magnet Synchronous Motors

Publication Year: 2013, Page(s):1185 - 1192
Cited by:  Papers (19)
| | PDF (1613 KB) | HTML

In this paper, a novel method is proposed to detect demagnetization fault in surface mounted permanent magnet synchronous motors (SMPMSMs). Hence, a theoretical analysis is presented for feature extraction and pattern recognition via torque analysis. In this analysis, impacts of the saturation profile, stator slots and the fault severity are taken into account. So, using torque spectra, an efficie... View full abstract»

• ### Armature-Reaction Magnetic Field Analysis for Interior Permanent Magnet Motor Based on Winding Function Theory

Publication Year: 2013, Page(s):1193 - 1201
Cited by:  Papers (20)
| | PDF (2293 KB) | HTML

As the magnets are embedded in a rotor for the interior permanent magnet (IPM) motor, the distribution of the armature reaction magnetic field is different from that of the surface permanent magnet motor (SPM) type. Various methods have been used for the magnetic field solution, including analytical methods based on the winding function and the Laplacian-Poisson equation. However, in the IPM motor... View full abstract»

• ### Average Torque Separation in Permanent Magnet Synchronous Machines Using Frozen Permeability

Publication Year: 2013, Page(s):1202 - 1210
Cited by:  Papers (65)
| | PDF (2024 KB) | HTML

This paper investigates the average torque separation in permanent magnet (PM) synchronous machines. In order to accurately separate the PM and armature fields, and, hence, the torque components accounting for the magnetic saturation and crosscoupling, the frozen permeability (FP) method is often employed, while the torque can be calculated by different methods, such as Maxwell stress tensor and v... View full abstract»

• ### Investigation of Torque Ripples in Permanent Magnet Synchronous Machines With Skewing

Publication Year: 2013, Page(s):1211 - 1220
Cited by:  Papers (51)
| | PDF (2167 KB) | HTML

This paper investigates the influence of skewing on torque ripples, including the electromagnetic (EM) torque ripple, and the cogging torque, in permanent magnet (PM) machines. It is found that the effectiveness of skewing largely depends on the axial variation of a torque ripple phase but less on its magnitude under skewing. It is further found that, in both linear and nonlinear cases, the EM and... View full abstract»

## Aims & Scope

IEEE Transactions on Magnetics is a peer-reviewed, archival journal in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The journal publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.

Full Aims & Scope

## Meet Our Editors

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