Current induced switching of magnetic domains to a perpendicular configuration

Details Current induced switching of magnetic domains to a perpendicular configuration Current induced switching of magnetic domains to a perpendicular configuration

2000-10-18

arxiv.org/abs/cond-mat/0010255v2

Phys. Rev. B 63, 220407 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, major rewriting of the technical part

Scientific paper

10.1103/PhysRevB.63.220407

In a ferromagnet--normal-metal--ferromagnet trilayer, a current flowing perpendicularly to the layers creates a torque on the magnetic moments of the ferromagnets. When one of the contacts is superconducting, the torque not only favors parallel or antiparallel alignment of the magnetic moments, as is the case for two normal contacts, but can also favor a configuration where the two moments are perpendicular. In addition, whereas the conductance for parallel and antiparallel magnetic moments is the same, signalling the absence of giant magnetoresistance in the usual sense, the conductance is greater in the perpendicular configuration. Thus, a negative magnetoconductance is predicted, in contrast with the usual giant magnetoresistance.

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