Abstract
Spin torque oscillations near zero magnetic fields were investigated in a nanocontact magnetoresistive device. A typical auto-oscillation mode was observed with high amplitude and narrow linewidth in a vortex domain state of the free layer around the zero field. The number of branches was reduced to a single one with an increase of current over the threshold value. As a result, we observed a linear frequency change between a wider field range across zero fields with a high amplitude and a narrow linewidth for the oscillation. The frequency response to small bipolar applied fields is applicable to a weak-field sensor.
Original language | English |
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Article number | 113001 |
Journal | Applied Physics Express |
Volume | 6 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2013 Nov 1 |
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)