Abstract

We propose a new scheme for determining the eigenfrequency of magnetic vortex dynamics, which has been hardly detected electrically because of its nanoscale diameter on the order of the exchange length, without exploiting large magnetoresistive materials or distorted core trajectories for homodyne spin torque diode detection. We have succeeded in measuring the rectified voltage generated via the in-plane anisotropic magnetoresistance effect using ac current at twice the frequency of the core gyration, and our method enables us to detect electrical signals originating from nondistorted symmetric circular gyration.

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