202 research outputs found
Current-induced reversal in magnetic nanopillars passivated by silicon
We demonstrate that magnetic multilayer nanopillars can be efficiently
protected from oxidation by coating with silicon. Both the protected and the
oxidized nanopillars exhibit an increase of reversal current at cryogenic
temperatures. However the magnetic excitation onset current increases only in
the oxidized samples. We show that oxidized nanopillars exhibit anomalous
switching statistics at low temperature, providing a simple test for the
quality of magnetic nanodevices.Comment: 3 pages, 4 figure
Effect of Polarized Current on the Magnetic State of Antiferromagnet
We provide evidence for the effects of spin polarized current on a
nanofabricated antiferromagnet incorporated into a spin-valve structure.
Signatures of current-induced effects include bipolar steps in differential
resistance, current-induced changes of exchange bias correlated with these
steps, and deviations from the statistics expected for thermally activated
switching of spin valves. We explain our observations by a combination of spin
torque exerted on the interfacial antiferromagnetic moments, and
electron-magnon scattering in antiferromagnet.Comment: 4 pages, 4 figure
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