Electrical determination of vortex state in submicron magnetic elements.
Ajay Gangwar, Hans G. Bauer, Jean-Yves Chauleau, Matthias Noske, Markus Weigand, Hermann Stoll, Gisela Schütz, and Christian H. Back
| AMR spectra measured on a disk shaped sample for (a) up (p=+1) and (b) down (p=−1) polarization of the vortex core for an excitation current of 1.2 mA. The sample design is shown in the inset of (a). By applying a rotating current (counterclockwise or clockwise) the VC polarity can be switched selectively to up or down. A sign change of the AMR voltage signal can be observed for the two polarities. Note that a significant shift of the resonance frequency to higher frequencies is observed at larger bias fields. Also note that the fine structure observed in the spectra does not depend on the VC polarity. |
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