☆ 4.5 Article

Current-dependent linewidth of a spin-transfer nano-oscillator

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS (2009)

Journal

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Volume 321, Issue 8, Pages 990-995

Publisher

ELSEVIER

DOI: 10.1016/j.jmmm.2008.03.011

Keywords

Spin torque; Spin transfer; Oscillator; Phase noise; Linewidth

Categories

Materials Science, Multidisciplinary Physics, Condensed Matter

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Abstract

Power spectra of a spin-transfer nano-oscillator, in which a reflection layer is included, are measured for current densities upto 1.2 x 10(7) A/cm(2). A clear oscillation peak, which is slightly asymmetric with respect to the peak frequency, is observed at 5 GHz under the external field of 700 Oe. The large red shift of the peak frequency on increasing the current, which has been reported in nano-contact devices, is not observed. The relatively low oscillation frequencies as well as the absence of the large red shift indicate the reduction in the demagnetizing field in the free layer. The linewidth decreases with the current and is inversely proportional to the square of the precession amplitude of magnetization in accordance with the recent linear theories. (C) 2008 Elsevier B.V. All rights reserved.

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