Numerical investigation of spin-torque using the Heisenberg model
- 325 Downloads
We present numerical calculations of the spin transfer torque resulting in current-induced domain wall motion. Rather than the conventional micromagnetic finite difference or finite element method, we use an atomistic/classical Heisenberg spin model approach, which is well suited to study geometrically confined domain walls. We compute the behaviour of domain walls in a one dimensional chain when currents are injected using adiabatic and non-adiabatic spin torque terms. Our results are compared to analytical calculations and are found to agree very well for small current densities. At larger current densities deviations are observed, which can be attributed to the approximations used in the analytical calculations.
PACS.72.25.Ba Spin polarized transport in metals 72.25.Pn Current-driven spin pumping
Unable to display preview. Download preview PDF.
- C.C. Faulkner et al., J. Appl. Phys. 95, 6716 (2004) Google Scholar
- A. Himeno et al., J. Appl. Phys. 99, 08G304 (2006) Google Scholar
- R.P. Cowburn, Patents PCT/GB2003/001266, PCT/GB2004/000840 (2004) Google Scholar
- J.C. Slonczewski, J. Magn. Magn. Mater. 159, L1 (1996) Google Scholar
- S.S.P. Parkin, U.S. patent 6,834,005 (2003) Google Scholar
- U. Nowak, in Annual Reviews of Computational Physics IX, edited by D. Stauffer (World Scientific, Singapore, 2001), p. 105 Google Scholar
- H. Kronmüller, M. Fähnle, in: Micromagnetism and the Microstructure of Ferromagnetic Solids, Cambridge University Press (2003) Google Scholar
- A. Aharoni, Introduction to the theory of ferromagnetism, (Clarendon Press, Oxford, 1996) Google Scholar
- The OOMMF software is available at http://math.nist.gov/oommf Google Scholar
- C.W. Gardiner, Handbook of Stochastic Methods (Springer-Verlag, Berlin 1990) Google Scholar