Journal of Applied Sciences ›› 1991, Vol. 9 ›› Issue (4): 297-301.

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FOLDOVER EFFECTS AND THE SECOND-ORDERSPIN-WAVE INSTABILITY THRESHOLD OFFMR IN YIG SINGLE CRYSTAL FILMSUNDER PERPENDICULAR PUMPING

ZHANG YOUTING   

  1. Shanghai University of Science and Technology
  • Received:1990-05-28 Revised:1990-11-22 Online:1991-12-31 Published:1991-12-31

Abstract: Experimental results of the foldover effect in FMR for YIG single crystal films under perpendicular pumping were reported by the author and his co-workers. The objective of this work was to further analyze these experimental results, and to discuss the second-order spin-wave instability threshold for film samples. Analytical results indicated that the foldover of FMR at high continuous-wave power excitation conditions was mainly due to the sample heating. There was no obvious foldover for FMR with static magnetic field in the film plane, but foldover for FMR with static magnetic field perpendicular to the film plane was observed under pulsed microwave excitation conditions.

Key words: threshold, Ferromagnetic resonance, foldover effect