Transition from the macrospin to chaotic behaviour by a spin-torque driven magnetization precession of a square nanoelement

Details Transition from the macrospin to chaotic behaviour by a spin-torque driven magnetization precession of a square nanoelement Transition from the macrospin to chaotic behaviour by a spin-torque driven magnetization precession of a square nanoelement

2004-08-27

arxiv.org/abs/cond-mat/0408615v1

Physics

Condensed Matter

Other Condensed Matter

Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.71.052403

We demonstrate (using full-scale micromagnetic simulations) that the spin injection driven steady-state precession of a thin magnetic nanoelement exhibit a complicate transition from the quasi-macrospin to the chaotic behaviour with the increasing element size. For nanoelement parameters typical for those used experimentally we have found that the macrospin approximation becomes invalid already for very small nanoelement sizes (~ 30 nm), in contrast to the previously reported results (Li and Zhang, Phys. Rev. B, vol. B68, 024404-1 (2003))

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