Influence of temperature on the gyrotropic eigenmode of magnetic vortices

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2011

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Magnetic vortices in ferromagnetic thin-film structures can be excited to gyrate resonantly at a characteristic eigenfrequency. The influence of temperature on the gyrotropic eigenfrequency of vortices in micrometer-sized permalloy squares is studied. Ferromagnetic absorption measurements around room temperature show that the eigenfrequency is decreased by 5.4% when the temperature is increased by 100 °C. The lowering of the saturation magnetization and the associated modification of the potential of gyration is discussed as a reason for the frequency shift within the model of the harmonic oscillator. Micromagnetic simulations confirm a linear relation between the eigenfrequency and the saturation magnetization. Absorption measurements under application of static external magnetic fields yield the same percentage frequency shift as without external field when gyrations around equally displaced equilibrium positions are compared. © 2011 American Physical Society.

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Forschungsinformationssystem der UHH

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