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Direct Detection of Nonlinear Ferromagnetic Resonance in Thin Films by the Magneto-Optical Kerr Effect



Thomas Gerrits, Pavol Krivosik, Michael L. Schneider, C E. Patton, Thomas J. Silva


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.
Physical Review Letters


ferromagnetic resonance, instability threshold, Magneto Optical Kerr Effect, Suhl instability
Created May 16, 2007, Updated February 19, 2017