Microwave absorption properties of permalloy nanodots in the vortex and quasi-uniform magnetization states
Kakazei, Gleb N.
Kobljanskyj, Yu V.
Melkov, G. A.
Slavin, A. N.
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New Journal of Physics 16 : (2014) // Article ID 063044
When the in-plane bias magnetic field acting on a flat circular magnetic dot is smaller than the saturation field, there are two stable competing magnetization configurations of the dot: the vortex and the quasi-uniform (C-state). We measured microwave absorption properties in an array of non-interacting permalloy dots in the frequency range 1-8 GHz when the in-plane bias magnetic field was varied in the region of the dot magnetization state bi-stability. We found that the microwave absorption properties in the vortex and quasi-uniform stable states are substantially different, so that switching between these states in a fixed bias field can be used for the development of reconfigurable microwave magnetic materials.