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Alternating current driven instability in magnetic junctions

Authors :
Epshtein, E. M.
Zilberman, P. E.
Publication Year :
2008

Abstract

An effect is considered of alternating (high-frequency) current on the spin-valve type magnetic junction configuration. The stability with respect to small fluctuations is investigated in the macrospin approximation. When the current frequency is close to the eigenfrequency (precession frequency) of the free layer, parametric resonance occurs. Both collinear configurations, antiparallel and parallel ones, can become unstable under resonance conditions. The antiparallel configuration can become unstable under non-resonant conditions, also. The threshold current density amplitude is of the order of the dc current density switching the magnetic junction.<br />Comment: 8 pages

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.0810.4753
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/0953-8984/21/14/146003