Current-Induced Torques in Magnetic Metals: Beyond Spin Transfer

Details Current-Induced Torques in Magnetic Metals: Beyond Spin Transfer Current-Induced Torques in Magnetic Metals: Beyond Spin Transfer

2007-09-25

arxiv.org/abs/0709.3862v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 figures, to appear in Journal of Magnetism and M

Scientific paper

10.1016/j.jmmm.2007.12.020

Current-induced torques on ferromagnetic nanoparticles and on domain walls in ferromagnetic nanowires are normally understood in terms of transfer of conserved spin angular momentum between spin-polarized currents and the magnetic condensate. In a series of recent articles we have discussed a microscopic picture of current-induced torques in which they are viewed as following from exchange fields produced by the misaligned spins of current carrying quasiparticles. This picture has the advantage that it can be applied to systems in which spin is not approximately conserved. More importantly, this point of view makes it clear that current-induced torques can also act on the order parameter of an antiferromagnetic metal, even though this quantity is not related to total spin. In this informal and intentionally provocative review we explain this picture and discuss its application to antiferromagnets.

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