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4 November 2016 Domain wall motion in ferromagnetically and antiferromagnetically coupled nanowires (Conference Presentation)
Majd Kuteifan, Sidi Fu, Stephane Mangin, Eric E. Fullerton, Vitaliy Lomakin
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Proceedings Volume 9931, Spintronics IX; 99312D (2016) https://doi.org/10.1117/12.2240630
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States
Abstract
demonstrate that the DW velocity can be significantly increased in antiferomagnetically coupled nanowires. The DW velocity increase is related to the exchange fields and reduction or elimination of the magnetostatic effects, which lead to reduction or elimination of the Walker breakdown. In addition, the reduction of the magnetostatic effects results in the reduction of the effects due to the pinning sites and disorder present in most nanomagnetic systems. The reduction of the pinning site and disorder effects further leads to a steadier DW motion. The study includes an analytical model for explaining how and why the Walker breakdown is overcome as well as numerical study supporting the analytical model and providing insights into the effects of the material and structural disorder. The numerical study is based on micromagnetic simulations solving the Landau-Lifshitz-Gilbert equation with continuous spin transfer torque components. The parameter space considered in the models and simulations includes the material properties, various types of disorder, and the exchange coupling in coupled systems. In addition, we discuss various aspects associated with modeling the DW motion in thin nanowires with disorder, including simulation speed, numerical stability, and the simulation model creation.
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Majd Kuteifan, Sidi Fu, Stephane Mangin, Eric E. Fullerton, and Vitaliy Lomakin "Domain wall motion in ferromagnetically and antiferromagnetically coupled nanowires (Conference Presentation)", Proc. SPIE 9931, Spintronics IX, 99312D (4 November 2016); https://doi.org/10.1117/12.2240630
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KEYWORDS
Motion models
Systems modeling
Nanowires
Computer simulations
Numerical stability
Current controlled current source
Spintronics
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