Spin dynamics in point contacts to single ferromagnetic films

Details Spin dynamics in point contacts to single ferromagnetic films Spin dynamics in point contacts to single ferromagnetic films

2008-06-24

arxiv.org/abs/0806.3805v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.79.092419

Excitation of magnons or spin-waves driven by nominally unpolarized transport currents in point contacts of normal and ferromagnetic metals is probed by irradiating the contacts with microwaves. Two characteristic dynamic effects are observed: a rectification of off-resonance microwave current by spin-wave nonlinearities in the point contact conductance, and a resonant stimulation of spin-wave modes in the nano-contact core by the microwave field. These observations provide a direct evidence that the magnetoconductance effects observed are due to GHz spin dynamics at the ferromagnetic interface driven by the spin transfer torque effect of the transport current.

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