Abstract
Investigations of mode locking of spin waves in YIG by nonlinear magnetoelastic coupling have been extended to low temperatures. Due to an increase of the spin-wave linewidth of YIG at low temperature, more spin-wave modes can be excited and, consequently, stronger mode-locking effects are observed. In our experiment more than 10 modes of spin waves have been mode locked. The variation of number of modes as a function of temperature is presented. In addition, a pickup coil is placed near the sample to measure any changes in mz. Since, for small perturbations, mz = 1 − ½ (mx1+my2), beating among different spin-wave modes will cause time variations of mz at the various beat frequencies. An enchancement of the harmonic content is observed upon the application of a mode-locking acoustic wave.
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