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|a Najafi, M.
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|a kruger, B.
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|a Bohlens, S.
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|a Franchin, M.
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|a Fangohr, H.
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|a Vanhaverbeke, A.
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|a Allenspach, R.
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|a Bolte, M.
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|a Merkt, U.
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|a Pfannkuche, D.
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|a Moller, D.P.F.
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|a Meier, G.
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|a Proposal for a standard problem for micromagnetic simulations including spin-transfer torque
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|c 2009-06.
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|z Get fulltext
|u https://eprints.soton.ac.uk/71981/1/naja_09.pdf
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|a The spin-transfer torque between itinerant electrons and the magnetization in a ferromagnet is of fundamental interest for the applied physics community. To investigate the spin-transfer torque, powerful simulation tools are mandatory. We propose a micromagnetic standard problem includingthe spin-transfer torque that can be used for the validation and falsication of micromagnetic simulation tools. The work is based on the micromagnetic model extended by the spin-transfer torque in continuously varying magnetizations as proposed by Zhang and Li. The standard problem geometry is a permalloy cuboid of 100 nm edge length and 10 nm thickness, which contains a Landau pattern with a vortex in the center of the structure. A spin-polarized dc current density of 1012 A/m2 flows laterally through the cuboid and moves the vortex core to a new steady-state position. We show that the new vortex-core position is a sensitive measure for the correctness of micromagnetic simulatorsthat include the spin-transfer torque. The suitability of the proposed problem as a standard problem is tested by numerical results from four different finite-difference and finite-element-based simulation tools.
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|a Article
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