Multiple ferromagnetic resonance in mesoscopic permalloy rings

Using a broadband microwave spectrometer we have investigated the magnetization dynamics of mesoscopic ferromagnetic disks and rings in the frequency range from 45 MHz to 20 GHz . We studied permalloy rings with an outer diameter of 2 μ m and different ring widths w . In the mesoscopic devices we find several ferromagnetic resonance (FMR) lines which shift with the in-plane magnetic field H b . Among them, two pronounced FMR modes are identified. We attribute these modes to localized spin waves in different ring segments where the characteristic resonance frequency either decreases or increases as a function of w , depending on the orientation of the ring segment with respect to H b .


Published in:
Journal of Applied Physics, 97, 10, 10A712
Year:
2005
ISSN:
0021-8979, 1089-7550
Keywords:
Laboratories:




 Record created 2015-07-07, last modified 2018-03-17

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