Micromagnetic Modeling for a Study of Spin Transfer Torque in Ferromagnetic Materials

Samutchar Coomkeaw; Badin Damrongsak

doi:10.4028/www.scientific.net/AMM.781.219

Paper Titles

Signal Analysis of Scratch-Detection on Magnetic Disc by Using Light Reflection Approach
p.203

Effects of Magnetic Properties of L1₀-CoPt based Bit Patterned Media with Tilted-Easy Axis on Switching Field at Areal Density over 2 Tb/in²
p.207

Role of Intergrain and Intragrain Coupling on Switching Field of Granular Exchange Coupled Composite Media Using Microwave Assisted Magnetic Recording
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Investigation of Perpendicular Magnetic Recording Footprint by Spin-Stand Microscopy
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Micromagnetic Modeling for a Study of Spin Transfer Torque in Ferromagnetic Materials
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Equalizer Design for Bit-Patterned Media Recording System Based on ISI and ITI Estimations by Cross Correlation Functions
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Laser Cleaning of Polypropylene Contamination on Magnetic Head Slider Surface
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Determination of Transition Jitter Noise by Time Domain Analysis
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The Synthesis of Nano-Porous Alumina by Anodization Process
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 781Micromagnetic Modeling for a Study of Spin...

Micromagnetic Modeling for a Study of Spin Transfer Torque in Ferromagnetic Materials

Abstract:

We have developed a numerical model for investigating a motion of magnetic moments in ferromagnetic materials with spin transfer torque (STT). The model can be used to provide a basic understanding of the switching dynamics and can be used as a tool to design and develop magnetic random access memories (MRAM). The relevant equation used in this work was the Landau-Lifshitz-Gilbert (LLG) equation with the additional STT term. The equation was used to describe the dynamical behavior of a magnetization which is exposed to an applied spin current and an effective field. The effects of thermal fluctuations on the motion of magnetic moments were excluded. The model was implemented in MATLABTM using a finite difference method (FDM). The program was verified with two-spin system and standard problems. Simulation results were also compared with those obtained from OOMMF.

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Periodical:

Applied Mechanics and Materials (Volume 781)

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219-222

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.781.219

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Online since:

August 2015

Authors:

Samutchar Coomkeaw, Badin Damrongsak*

Keywords:

Micromagnetic Modeling, MRAM, Spin Transfer Torque, STT

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References

[1] J. Akerman, APPLIED PHYSICS: Toward a Universal Memory, Science 308 (2000): 508–510.

Google Scholar

[2] J. Miltat and M. J. Donahue, Numerical Micromagnetics: Finite Difference Methods, in: H. Kronmüller, S. Parkin (Eds. ), Handbook of Magnetism and Advanced Magnetic Materials, John Wiley & Sons, Ltd., (2007).

DOI: 10.1002/9780470022184.hmm202

Google Scholar

[3] L. Berger, Emission of spin waves by a magnetic multilayer traversed by a current, Phys. Rev. B. 54 (1996), 9353.

DOI: 10.1103/physrevb.54.9353

Google Scholar

[4] M. D. Stiles and J. Miltat, Spin Transfer Torque and Dynamics, in: B. Hillebrands, A. Thiaville (Eds. ), Spin Dynamics in Confined Magnetic Structures III: Topics in Applied Physics 101, Springer, Berlin, 2006, p.225 – 308.

DOI: 10.1007/10938171_7

Google Scholar

[5] M. Najafi et al., Proposal for a standard problem for micromagnetic simulations including spin-transfer torque, J. Appl. Phys. 105 (2009).

Google Scholar

[6] OOMMF User's Guide, Version 1. 0, National Institute of Standards and Technology, Gaithersburg, MD, (2010).

Google Scholar

[7] T. L. Gilbert, A phenomenological theory of damping in ferromagnetic materials, IEEE Trans. Mag. 40 (2004): 3443–3449.

DOI: 10.1109/tmag.2004.836740

Google Scholar