| Autor: |
Najafi, Massoud, Krüger, Benjamin, Bohlens, Stellan, Franchin, Matteo, Fangohr, Hans, Vanhaverbeke, Antoine, Allenspach, Rolf, Bolte, Markus, Merkt, Ulrich, Pfannkuche, Daniela, Möller, Dietmar P. F., Meier, Guido |
| Předmět: |
|
| Zdroj: |
Journal of Applied Physics; Jun2009, Vol. 105 Issue 11, p113914-1-113914-8, 8p, 1 Chart, 7 Graphs |
| Abstrakt: |
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 including the spin-transfer torque that can be used for the validation and falsification 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 simulators that 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
