# IEEE Transactions on Magnetics

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

Publication Year: 2011, Page(s): C1
| PDF (266 KB)
• ### IEEE Transactions on Magnetics publication information

Publication Year: 2011, Page(s): C2
| PDF (38 KB)

Publication Year: 2011, Page(s):4669 - 4670
| PDF (65 KB)
• ### Hard Magnetic Materials: A Perspective

Publication Year: 2011, Page(s):4671 - 4681
Cited by:  Papers (139)
| | PDF (674 KB) | HTML

The principles of operation of permanent magnets are summarized, and their development is reviewed. The key figure of merit, the energy product, improved exponentially over much of the 20th century, doubling roughly every 12 years. Yet it has not improved significantly in the last 20 years. Constraints on further development are explained, together with the limits of 1/4 μ0/M View full abstract»

• ### Q-Band Ferromagnetic Resonance Study of Fe Thin Films on GaAs(001) Deposited by RF Magnetron Sputtering

Publication Year: 2011, Page(s):4682 - 4685
Cited by:  Papers (2)
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The magnetic properties of epitaxial Fe(001) films, prepared on GaAs(001) substrates by RF magnetron sputtering, were investigated by ferromagnetic resonance spectroscopy operating at Q-band (35 GHz). The in-plane angle dependence of the resonance fields showed four-fold magnetic anisotropy with an easy (hard) direction along [100] ([110]). The anisotropy constant was slightly smaller than the mag... View full abstract»

• ### Monte Carlo Simulation of Magnetotransport Properties in $\hbox{La}_{0.67}\hbox{Ca}_{0.33}\hbox{MnO}_{3}$ (FM) and $\hbox{La}_{0.33}\hbox{Ca}_{0.67}\hbox{MnO}_{3}$ (AF) Thin Films

Publication Year: 2011, Page(s):4686 - 4694
Cited by:  Papers (4)
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Manganese perovskites have recently been the focus of renewed interest, due to the "colossal" magnetoresistance (CMR) effect and the coupled metal-insulator and magnetic transitions displayed at the spin-ordering temperature TC by some of these compounds. The essential ingredient of the CMR physics is not only the double-exchange interaction but also other competing interactions, such a... View full abstract»

• ### Effect of Size and Configuration on the Magnetization of Nickel Dot Arrays

Publication Year: 2011, Page(s):4695 - 4700
Cited by:  Papers (3)
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We report experimental results on magnetic properties of our fabricated nickel nanodot arrays studied with magnetic force microscopy (MFM) and magneto-optical Kerr effect (MOKE). Arrays of nickel dots with different size and periodicity were fabricated by electron-beam (E-B) lithography and lift-off processes. 50 nm thick arrays (200 nm × 200 nm) of nickel dots exhibit that the magnetizatio... View full abstract»

• ### Homogenization of Electromagnetic Force Field During Casting of Functionally Graded Composites

Publication Year: 2011, Page(s):4701 - 4706
Cited by:  Papers (9)
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The paper presents the analysis of the process of casting functionally graded composites under alternating electromagnetic field. The process utilizes the effect of electromagnetic buoyancy on nonconductive particles of the reinforcement in the conducting liquid (melted metal). The authors analyzed the possibilities of homogenizing the distribution of electromagnetic field in such a way as to obta... View full abstract»

• ### Models for Extrapolation of Magnetization Data on Magnetic Cores to High Fields

Publication Year: 2011, Page(s):4707 - 4711
Cited by:  Papers (7)
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Reliable representation of magnetization curves at higher magnetic fields is needed to accurately model and design devices in FEM software. Standard closed circuit magnetic induction measurements for ferromagnetic materials in such devices are usually limited to around 2 T for most Epstein frame equipment, above which, measurements become increasingly unreliable, as field generation capacity becom... View full abstract»

• ### Simultaneous Design Optimization of Permanent Magnet, Coils, and Ferromagnetic Material in Actuators

Publication Year: 2011, Page(s):4712 - 4716
Cited by:  Papers (11)  |  Patents (1)
| | PDF (993 KB) | HTML

This paper presents structural topology optimization of an electro/permanent magnet linear actuator. The optimization goal is to maximize the average magnetic force acting on a plunger that travels over a distance of 20 mm. To achieve this goal, the magnetic field sources (i.e., permanent magnet, positive and negative direction coils), and ferromagnetic material of the yoke are simultaneously co-d... View full abstract»

• ### Study of EDS & EMS Hybrid Suspension System With Permanent-Magnet Halbach Array

Publication Year: 2011, Page(s):4717 - 4724
Cited by:  Papers (18)
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In this paper, a permanent magnet (PM) electro-dynamic suspension and electro-magnetic suspension (EDS & EMS) hybrid suspension system is proposed to overcome the shortcomings of the under-damped dynamics in a PM EDS system. The linearized model is established and its stability is also analyzed using the Routh criterion. According to the rational distribution between the repulsive force and th... View full abstract»

• ### A Novel Structure for Low-Loss Radial Hybrid Magnetic Bearing

Publication Year: 2011, Page(s):4725 - 4733
Cited by:  Papers (26)
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This paper proposes a novel radial hybrid magnetic bearing (RHMB), which has integrative magnetic pole boards and continuous working air gaps that reduce the hysteresis and eddy-current losses of the traditional homopolar structure. Its configuration and working principle are introduced. The bias and control magnetic circuits of the RHMB are analyzed with the equivalent magnetic circuit method. Ma... View full abstract»

• ### Structure of One-Axis Controlled Repulsive Type Magnetic Bearing System With Surface Permanent Magnets Installed and Its Levitation and Rotation Tests

Publication Year: 2011, Page(s):4734 - 4739
Cited by:  Papers (23)
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This paper deals with a new bearing structure of one-axis controlled repulsive type magnetic bearing system that has a motor function of a surface permanent magnet (SPM). We evaluated the magnetic bearing structures by using the 4-pole 4-segment type and 4-pole Halbach array, which were placed around cylindrical permanent magnet sets as field magnets. The comparison of magnetic flux density in the... View full abstract»

• ### Design of Compact Linear Electromagnetic Actuator for Auto-Focusing in Phone Camera

Publication Year: 2011, Page(s):4740 - 4744
Cited by:  Papers (8)
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This paper proposes a novel linear electromagnetic actuator (LEA) for auto-focusing of compact phone cameras. An LEA consists of permanent magnets, iron cores, and coils, which are all magnetic circuit components. When coils are powered, induced magnetic field generates N and S poles around iron cores. Thus, unlike voice coil motors (VCMs) that employ the Lorentz force, the motion of the moving pa... View full abstract»

• ### EC-GMR Data Analysis for Inspection of Multilayer Airframe Structures

Publication Year: 2011, Page(s):4745 - 4752
Cited by:  Papers (16)
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Eddy-current testing (ECT) is widely used in inspection of multilayer aircraft skin structures for the detection of cracks under fasteners (CUF). Detection of deep hidden CUF poses a major challenge in traditional ECT techniques largely because the weak eddy-current signal due to a subsurface crack is dominated by the strong signal from the aluminum or steel fastener. Giant magnetoresistive (GMR) ... View full abstract»

• ### Reduction of Lift-Off Effects in Pulsed Eddy Current for Defect Classification

Publication Year: 2011, Page(s):4753 - 4760
Cited by:  Papers (41)
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Pulsed eddy-current (PEC) testing is an electromagnetic nondestructive testing & evaluation (NDT&E) technique and defect classification is one of the most important steps in PEC defect characterization. With pulse excitation, the PEC response signals contain more features in time domain and rich information in frequency domain. This paper investigates feature extraction techniques for PEC ... View full abstract»

• ### Design of Gradient Coil for Magnetic Resonance Imaging Applying Particle-Swarm Optimization

Publication Year: 2011, Page(s):4761 - 4768
Cited by:  Papers (3)
| | PDF (1052 KB) | HTML

Designing a gradient coil for magnetic resonance imaging (MRI) is an electromagnetic inverse problem often formulated as a constrained optimization, which has been successfully solved by inverse boundary element methods. The constant search for new coil features and improved performance has highlighted the need of employing more versatile optimization techniques capable of dealing with the new req... View full abstract»

• ### Recording Behavior of Exchange Coupled Composite Media

Publication Year: 2011, Page(s):4769 - 4774
Cited by:  Papers (6)
| | PDF (486 KB) | HTML

The recording behavior of exchange coupled composite (ECC) media is investigated. It is found experimentally that the change of the written track width is less pronounced as a function of linear density when the write-ability is controlled by varying the vertical exchange coupling between the various layers in the medium stack as opposed to varying the lateral exchange coupling between the grains.... View full abstract»

• ### Investigation of Two-Dimensional Magnetic Recording (TDMR) With Position and Timing Uncertainty at 4 Tb/in$^{2}$

Publication Year: 2011, Page(s):4775 - 4780
Cited by:  Papers (6)
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The feasibility of two-dimensional magnetic recording (TDMR) at 4 Tb/in2 customer areal-density is investigated via numerical simulations. In addition to the coding overhead needed to correct possible errors in a TDMR channel, the overhead required to obtain accurate position and timing estimates is taken into account in determining achievable customer density. The TDMR channel model us... View full abstract»

• ### Influence of the Electrical Steel Grade on the Performance of the Direct-Drive and Single Stage Gearbox Permanent-Magnet Machine for Wind Energy Generation, Based on an Analytical Model

Publication Year: 2011, Page(s):4781 - 4790
Cited by:  Papers (15)
| | PDF (613 KB) | HTML

The performance of a variable speed wind turbine using a direct-drive permanent-magnet synchronous generator (PMSG) as well as a PMSG with single stage planetary gearbox is compared for two grades of electric steel applied for the generator stator core lamination. A ring type, radial flux PMSG is modeled. For a fixed mechanical power input, the geometry of the generator is optimized for each turbi... View full abstract»

• ### Analytical Open-Circuit Magnetic Field Distribution of Slotless Brushless Permanent-Magnet Machines With Rotor Eccentricity

Publication Year: 2011, Page(s):4791 - 4808
Cited by:  Papers (31)
| | PDF (1419 KB) | HTML

Analytical expressions for the no-load magnetic field distribution of slotless brushless permanent-magnet (PM) machines with static, dynamic, and mixed rotor eccentricities are presented. The proposed analytical expressions can be used for slotless brushless PM machines with any radius-independent magnetization pattern. The analytical expressions and the results for six different magnetization pat... View full abstract»

• ### A Linear Doubly Salient Permanent-Magnet Motor With Modular and Complementary Structure

Publication Year: 2011, Page(s):4809 - 4821
Cited by:  Papers (28)  |  Patents (1)
| | PDF (1467 KB) | HTML

A linear doubly salient permanent magnet (LDSPM) motor is particularly suitable for long stator applications due to its simple and low cost stator, which consists of only iron. This paper proposes a new LDSPM motor design with complementary and modular structure. The key of this structure is that the primary mover is composed of two modules whose positions are mutually four and one half of the sta... View full abstract»

• ### Thermal Model With Winding Homogenization and FIT Discretization for Stator Slot

Publication Year: 2011, Page(s):4822 - 4826
Cited by:  Papers (29)
| | PDF (610 KB) | HTML

The aim of the method detailed in this paper is to get an equivalent thermal model of a stator slot, in order to simplify the calculation of desired temperatures in an electrical machine winding. This study is divided in two steps: First, the equivalent thermal conductivity is deduced from a homogenization of the winding, and next, a discretization is achieved using the finite integration techniqu... View full abstract»

• ### Reduction of Unbalanced Magnetic Pull in Synchronous Machines due to Parallel Circuits

Publication Year: 2011, Page(s):4827 - 4833
Cited by:  Papers (9)
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This paper describes an analysis of the damping of unbalanced magnetic pull (UMP) in salient pole synchronous machines due to parallel stator circuits. Measurements of the UMP and currents in the parallel circuits have been performed on a 12-pole generator with the stator displaced relative to the rotor, creating a static eccentricity, and the stator winding connected as one circuit or two paralle... View full abstract»

• ### Correction to “Estimation of Fichera-Type Eigenvalues Using Standard Functions” [Aug 09 3046-3054]

Publication Year: 2011, Page(s): 4834
| | PDF (35 KB) | HTML

In the above titled paper (ibid., vol. 45, no. 8, pp. 3046-3054, Aug. 2009), Equation (10) was presented incorrectly. The correction is presented here. 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