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

K. Mizushima, T. Nagasawa, K. Kudo, Y. Saito, R. Sato

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

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.

Original languageEnglish
Article number152501
JournalApplied Physics Letters
Volume94
Issue number15
DOIs
Publication statusPublished - 2009 Apr 27
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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