Phys. Rev. Lett. 98, 207602 (2007) [4 pages]Direct Detection of Nonlinear Ferromagnetic Resonance in Thin Films by the Magneto-Optical Kerr EffectReceived 9 January 2007; published 16 May 2007 The longitudinal magneto-optical Kerr effect is used to obtain a calibrated measure of the dynamic magnetization response over the ferromagnetic resonance (FMR) profile for in-plane magnetized Permalloy films excited with high power in-plane transverse microwave fields at 1.25 to 3.75 GHz and in-plane precession angles up to about 20°. The data provide a profound demonstration of the Suhl threshold effect for parametric spin wave generation for angles above about 14°, the magnetization precession lock-up just above threshold, and the complicated response over the full FMR profile at very high powers. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.207602
DOI:
10.1103/PhysRevLett.98.207602
PACS:
76.50.+g, 72.10.Di, 75.30.Ds, 78.20.Ls
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