Abstract
We investigate the frequency response of CoFeB/MgO/CoFeB based tunneling magnetoresistance sensors with the perpendicular anisotropy. The 3 dB cut-off frequency (f3dB) strongly and non-monotonically depends on resistance-area product (RA), which is controlled by MgO thickness. Both high and low RA sensors achieved wide frequency bandwidth; however, we observed a maximum f3dB of 45 MHz at around 20 kΩ μm2. The bandwidth of the sensors increases with bias voltage of both polarity and is higher under positive polarity. This opens possibilities of using the sensors for high-speed magnetic field sensing and for improving their bandwidth by tuning RA and the bias.
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