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Proposal for a standard problem for micromagnetic simulations including spin-transfer torque

Proposal for a standard problem for micromagnetic simulations including spin-transfer torque
Proposal for a standard problem for micromagnetic simulations including spin-transfer torque
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.
micromagnetic simulation, spin-transfer torque, standard problem, verication of simulation tools, OOMMF, NMag, M3S
0021-8979
113914-[11pp]
Najafi, M.
aea76957-22d0-4e21-aa95-6c31126aedf7
kruger, B.
3f60aef4-ea9f-4fd9-bf6a-56c57b5fbd04
Bohlens, S.
a63f350f-ac29-48c2-95bf-84881440380d
Franchin, M.
2a19778e-3ee9-4770-ba7e-6ccc91f49ab0
Fangohr, H.
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Vanhaverbeke, A.
8c7970ac-67bd-4da2-af1b-59bdda9da887
Allenspach, R.
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Bolte, M.
5cbf45ff-2b73-40ee-b07f-439a855a6db8
Merkt, U.
59c2e162-688c-458f-9c79-bf4d4793f0fa
Pfannkuche, D.
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Moller, D.P.F.
94d6bdc6-1535-47b7-b380-4573cb6d9c6b
Meier, G.
c424c194-b04c-4719-9514-d4c26bf902fa
Najafi, M.
aea76957-22d0-4e21-aa95-6c31126aedf7
kruger, B.
3f60aef4-ea9f-4fd9-bf6a-56c57b5fbd04
Bohlens, S.
a63f350f-ac29-48c2-95bf-84881440380d
Franchin, M.
2a19778e-3ee9-4770-ba7e-6ccc91f49ab0
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Vanhaverbeke, A.
8c7970ac-67bd-4da2-af1b-59bdda9da887
Allenspach, R.
a975f83c-c944-4533-903e-d5942281d234
Bolte, M.
5cbf45ff-2b73-40ee-b07f-439a855a6db8
Merkt, U.
59c2e162-688c-458f-9c79-bf4d4793f0fa
Pfannkuche, D.
0bd8ed69-28d3-429e-8dec-212c05ef4252
Moller, D.P.F.
94d6bdc6-1535-47b7-b380-4573cb6d9c6b
Meier, G.
c424c194-b04c-4719-9514-d4c26bf902fa

Najafi, M., kruger, B., Bohlens, S., Franchin, M., Fangohr, H., Vanhaverbeke, A., Allenspach, R., Bolte, M., Merkt, U., Pfannkuche, D., Moller, D.P.F. and Meier, G. (2009) Proposal for a standard problem for micromagnetic simulations including spin-transfer torque. Journal of Applied Physics, 105, 113914-[11pp]. (doi:10.1063/1.3126702).

Record type: Article

Abstract

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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naja_09.pdf - Accepted Manuscript
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Published date: June 2009
Keywords: micromagnetic simulation, spin-transfer torque, standard problem, verication of simulation tools, OOMMF, NMag, M3S

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Local EPrints ID: 71981
URI: https://eprints.soton.ac.uk/id/eprint/71981
ISSN: 0021-8979
PURE UUID: a8182911-af80-4e48-8d9b-080803e84174

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Date deposited: 14 Jan 2010
Last modified: 18 Jul 2017 23:57

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Contributors

Author: M. Najafi
Author: B. kruger
Author: S. Bohlens
Author: M. Franchin
Author: H. Fangohr
Author: A. Vanhaverbeke
Author: R. Allenspach
Author: M. Bolte
Author: U. Merkt
Author: D. Pfannkuche
Author: D.P.F. Moller
Author: G. Meier

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