# IEEE Transactions on Magnetics

## Volume 45 Issue 11  Part 2 • Nov. 2009

This issue contains several parts.Go to:  Part 1

## Filter Results

Displaying Results 1 - 25 of 27
• ### [Front cover]

Publication Year: 2009, Page(s): C1
| PDF (120 KB)
• ### IEEE Transactions on Magnetics publication information

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

Publication Year: 2009, Page(s):5177 - 5178
| PDF (62 KB)
• ### The 7th International Symposium on Hysteresis Modeling and Micromagnetics Conference Co-Chairs' Foreword

Publication Year: 2009, Page(s): 5179
| PDF (23 KB) | HTML
• ### Monte Carlo Simulation of the FM Layer Thickness Influence on the Exchange Bias in FM/AFM Bilayers

Publication Year: 2009, Page(s):5180 - 5183
Cited by:  Papers (11)
| | PDF (321 KB) | HTML

A Monte Carlo simulation study of the exchange bias properties in ferromagnetic/antiferromagnetic (FM/AFM) bilayers by using a classical Heisenberg model and the Metropolis algorithm is addressed. In our model several contributions including nearest neighbors exchange interactions, two different interface couplings, magnetocrystalline anisotropy, and a Zeeman term were considered. Our study focuse... View full abstract»

• ### Representation of Memory in Particle Assembly Hysteresis Models

Publication Year: 2009, Page(s):5184 - 5187
| | PDF (356 KB) | HTML

We have developed a mathematical tool able to track irreversible processes in magnetic systems described by the Stoner-Wohlfarth model, under any applied field history. A graphic representation is worked out that accounts for interactions, and turns out to be an extension of the one operating in the Preisach model. The response to alternating and rotating magnetizing fields have been investigated ... View full abstract»

• ### Measurement and Simulation of Vector Hysteresis Characteristics

Publication Year: 2009, Page(s):5188 - 5191
Cited by:  Papers (10)
| | PDF (441 KB) | HTML

This paper presents a Preisach model of ferromagnetic hysteresis to simulate the vector hysteresis properties of ferromagnetic materials. Vector behavior has been studied using a single sheet tester with a round shaped specimen at low frequency, and the magnetic flux density vector has been controlled by a digital measurement system. Circular magnetic flux density pattern has been measured. An inv... View full abstract»

• ### Analysis of a Unit Magnetic Particle Via the DPC Model

Publication Year: 2009, Page(s):5192 - 5195
Cited by:  Papers (22)
| | PDF (166 KB) | HTML

This paper presents a discussion of the properties and the behavior of an unit magnetic particle as calculated by the DPC (Della Torre, Pinzaglia and Cardelli) model. The general mathematical expressions of the vector field generated by the unit magnetic particle are derived in a special regular parametric coordinates system. It is shown that, in a special case, the DPC model leads to the same res... View full abstract»

• ### Geometry Influence on the Hysteresis Loops Behavior in La $_{2 / 3}$ Ca $_{1 / 3}$ MnO $_{3}$ Nanoparticles. Monte Carlo Simulation on a Heisenberg-Like Model

Publication Year: 2009, Page(s):5196 - 5199
Cited by:  Papers (9)
| | PDF (551 KB) | HTML

In this study we emphasize on the role of the geometry upon the magnetic and critical properties of ferromagnetic manganite nanoparticles having stoichiometry La2/3Ca1/3MnO3. To do that, we consider a set of fine particles of different shapes (spherical and polyhedral) containing approximately the same amount of ions (~8000 magnetic Mn ions) and distributed accordi... View full abstract»

• ### Multiscale Finite Element Solution of the Exchange Term in Micromagnetic Analysis of Large Bodies

Publication Year: 2009, Page(s):5200 - 5203
Cited by:  Papers (2)
| | PDF (851 KB) | HTML

This paper presents a finite element formulation of the Landau-Lifschitz equation, where the exchange field is decomposed in a coarse-scale and a fine-scale term, following a multiscale approach. The proposed method is validated by comparison with a standard finite element solution considering some typical magnetization distributions in a thin film. Finally, a magnetization process in the same thi... View full abstract»

• ### Critical Aspects in Micromagnetic Computation of Hysteresis Loops of Nanometer Particles

Publication Year: 2009, Page(s):5204 - 5207
Cited by:  Papers (5)  |  Patents (3)
| | PDF (176 KB) | HTML

This paper discusses the criticalities occurring in the computation of hysteresis loops by the numerical space-time integration of the Landau-Lifshitz-Gilbert equation. The magnetization time-update is obtained by means of two norm-conserving algorithms, respectively based on midpoint rule and Cayley transform. The study gives hints for the definition of a correct criterion of convergence towards ... View full abstract»

• ### A Coupled Multipole Expansion—Finite Element Approach for Dynamic Micromagnetic Modeling

Publication Year: 2009, Page(s):5208 - 5211
Cited by:  Papers (4)
| | PDF (326 KB) | HTML

This paper presents a 3-D dynamic micromagnetic numerical procedure, which efficiently computes the magnetostatic field by approximating the contributions of far magnetic dipoles with a multipole expansion technique. This approach is coupled to a finite element spatial reconstructor of the effective field, which leads to the reduction of the second order derivative in the exchange term. The proced... View full abstract»

• ### Thermally Initiated Reversal Modes in Infinite Periodic Ferromagnetic Wires

Publication Year: 2009, Page(s):5212 - 5215
Cited by:  Papers (1)
| | PDF (247 KB) | HTML

In finite ferromagnetic wires, the demagnetizing effects along the wire axis have a substantial influence on the reversal processes. By considering infinite wires, these effects are annihilated and only the sample dimensions, cross-sectional geometry, and material properties determine the magnetization reversal. The magnetization reversal is now initiated by small thermal fluctuations. With decrea... View full abstract»

• ### Numerical Solutions of the Fokker–Planck Equation for Magnetic Nanoparticles

Publication Year: 2009, Page(s):5216 - 5219
| | PDF (208 KB) | HTML

We present a method to solve numerically the Fokker-Planck equation for a uniformly magnetized nanoparticle. This approach is an algebraic formulation scheme that uses integral variables associated with space and time elements. This new method is compared with a spectral collocation method, similar to that referenced in a previous article. The stationary distribution, the eigenvalues of the Fokker... View full abstract»

• ### Numerical Analysis of the Nonlinear Excitation of Subcritical Spin-Wave Modes Within a Micromagnetic Framework

Publication Year: 2009, Page(s):5220 - 5223
Cited by:  Papers (5)
| | PDF (259 KB) | HTML

A micromagnetic analysis of the excitation of subcritical bullet modes by spin-polarized currents in magnetic nanocontact systems is carried out by taking into account the contributions arising from Oersted and thermal fields. It is demonstrated that the former yields an increase of the value of the excitation thresholds, whereas the latter represents the source of the nonlinear fluctuations neede... View full abstract»

• ### Analytical Description of Quasi-Random Magnetization Relaxation to Equilibrium

Publication Year: 2009, Page(s):5224 - 5227
Cited by:  Papers (8)
| | PDF (303 KB) | HTML

The Landau-Lifshitz (LL) dynamics of a uniformly magnetized particle is considered. The LL equation is written in the form of a Hamiltonian perturbed dynamical system. By using suitable averaging technique, the equation for the slow dynamics of the energy is derived. The averaging technique breaks up in the case of separatrix crossing. It is shown that, in the limit of small damping, the separatri... View full abstract»

• ### Hysteresis in Cognitive Processes

Publication Year: 2009, Page(s):5228 - 5230
| | PDF (215 KB) | HTML

Cognitive bias is a key feature of human decision making, and has an impact in a wide range of human endeavours. Certain features of the development of such bias suggest a hysteresis-type process at some level. Some possibilities for this process are suggested, and a simple model for the development of such bias introduced. Qualitative numerical results from this model are also presented. View full abstract»

• ### Modeling and Simulation of Noise Induced Phenomena in Complex Hysteretic Systems

Publication Year: 2009, Page(s):5231 - 5234
Cited by:  Papers (6)
| | PDF (472 KB) | HTML

A unitary framework for the analysis of noise induced phenomena in complex hysteretic systems is developed and implemented in an open-access academic software. Various differential, integral, and algebraic models of hysteresis are considered while the input processes are generated from arbitrary given spectra. The statistical algorithm based on Monte-Carlo techniques and used to compute the stocha... View full abstract»

• ### Control-Oriented Hysteresis Models for Magnetic Electron Lenses

Publication Year: 2009, Page(s):5235 - 5238
Cited by:  Papers (10)
| | PDF (441 KB) | HTML

This paper deals with finding appropriate hysteresis models that predict the behavior of electro-magnetic lenses used with electron microscopy. The iterative selection procedure consists of experiment design and mathematical analysis of hysteresis models. We will show two examples of pitfalls when the suitability of models is assessed by means of curve-fitting to observations. The first example il... View full abstract»

• ### Micromagnetic Analysis of Nonlinear Dynamics in Spintronic Analog Modulators

Publication Year: 2009, Page(s):5239 - 5242
Cited by:  Papers (7)
| | PDF (288 KB) | HTML

The simultaneous action of dc and ac spin-polarized current traversing a magnetic nanocontact device results in a combined amplitude-frequency nonlinear modulation process, a promising application of spin-transfer oscillators. A micromagnetic analysis of the nonlinear magnetization dynamics occurring in such devices is carried out in both spatial and frequency domain. Numerical results show that t... View full abstract»

• ### Experimental Verification of the Deletion and Congruency Properties in Si-Fe Magnetic Steels

Publication Year: 2009, Page(s):5243 - 5246
Cited by:  Papers (8)
| | PDF (262 KB) | HTML

This work presents an experimental procedure to verify if a model of vector hysteresis, the DPC model (Della Torre, Pinzaglia, Cardelli), based on the Preisach theory, can be identified for a given material. The identification can be achieved only if the material has a magnetic behavior in agreement with the properties of congruency and deletion which characterize the model. Finally, we show some ... View full abstract»

• ### Theoretical Considerations of Magnetic Hysteresis and Transformer Inrush Current

Publication Year: 2009, Page(s):5247 - 5250
Cited by:  Papers (22)
| | PDF (145 KB) | HTML

This paper presents an application of a hysteresis model that is coupled to an equivalent network for the calculation of the inrush current due to an arbitrary excitation of a transformer after a fault. The approach proposed, although using several simplifying assumptions, seems promising in order to calculate the optimal time to close the circuit after a fault. View full abstract»

• ### Ferromagnetic Nanoparticles Dose Based on Tumor Size in Magnetic Fluid Hyperthermia Cancer Therapy

Publication Year: 2009, Page(s):5251 - 5254
Cited by:  Papers (12)
| | PDF (508 KB) | HTML

The interest in magnetic fluid hyperthermia (MFH) and cancer therapy has noticeably increased in the last years. At present, a successful realization of this interdisciplinary research is hampered by some unsolved problems. One of these problems this paper intended to clarify is how to find an estimate of the appropriate dosage of magnetic nanoparticles that injected into the tumor would help achi... View full abstract»

• ### Conference Author Index

Publication Year: 2009, Page(s): 5255
| PDF (17 KB)

Publication Year: 2009, Page(s): 5256
| PDF (270 KB)

## 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