TITLE

Decrease of nonlinearity and linewidth narrowing in spin-transfer oscillators under the external field applied near the hard axis

AUTHOR(S)
Mizushima, K.; Nagasawa, T.; Kudo, K.; Saito, Y.; Sato, R.
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p152501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Angular dependence of power spectra is measured for tunnel-type spin-transfer oscillators by changing the direction of the external field in the plane. The oscillation frequency shows the red shift with increasing the current in the case that the field directions are away from the hard axis of the free layer. The frequency shift changes from red to blue at a specific direction near the hard axis, where the linewidth is much reduced. These results are explained by taking into account the nonlinearity arising from the in-plane anisotropy as well as that arising from the demagnetizing effect.
ACCESSION #
37831865

 

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