PROJECT TITLE :

Modulation of the Spectral Characteristics of a Nano-Contact Spin-Torque Oscillator via Spin Waves in an Adjacent Yttrium-Iron Garnet Film

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 will be detected by the nano-contact. In active mode, i.e., within the presence of auto-oscillations, vital changes appear in the NC-STO spectrum when its frequency approaches that of the SWs excited within the YIG. These results demonstrate sturdy coupling between NC-STOs and SWs in YIG and open new prospects of 1) pure spin-current generation in YIG by NC-STOs; a pair of) 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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