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Modulation of the spectral characteristics of a nano-contact spin-torque oscillator via spin waves in an adjacent YIG film

Journal article
Authors Michael Balinsky
Mohammad Haidar
Mojtaba Ranjbar
Philipp Dürrenfeld
Afshin Houshang
Anderi Slavin
Johan Åkerman
Published in IEEE Magnetics Letters
Volume 7
ISSN 1949-307X
Publication year 2016
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1109/LMAG.2016.253063...
Keywords Spin electronics, nanocontact spin-torque oscillators, spin waves (SWs), yttrium iron garnet.
Subject categories Magnetism

Abstract

NiFe-Cu-Co trilayer nano-contact spin-torque oscillators (NC-STOs) fabricated on an yttrium-iron garnet (YIG) film were studied in two different modes. In passive mode, i.e. without any NC-STO auto-oscillations, a microwave current through the nano-contact can excite spin waves (SW) in the YIG film, and, vice versa, antenna generated SWs in the YIG film can be detected by the nano-contact. In active mode, i.e., in the presence of auto-oscillations, significant changes appear in the NC-STO spectrum when its frequency approaches that of the SWs excited in the YIG. These results demonstrate strong coupling between NC-STOs and SWs in YIG and open new possibilities of 1) pure spin-current generation in YIG by NC-STOs; 2) mutual locking of a number of NC-STOs through SWs in YIG; and 3) improvement of NC-STO spectra through SW feedback in YIG.

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