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arXiv · 0806.3805

Spin dynamics in point contacts to single ferromagnetic films

O. P. Balkashin·V. V. Fisun·I. K. Yanson·L. Yu. Triputen·A. Konovalenko·V. Korenivski
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Abstract

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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O. P. Balkashin, V. V. Fisun, I. K. Yanson, L. Yu. Triputen, A. Konovalenko, V. Korenivski. 2008-06-24. Spin dynamics in point contacts to single ferromagnetic films. https://doi.org/10.1103/physrevb.79.092419

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