Response of magnetic tunnel junction-based spin-torque oscillator to series of sub-nanosecond magnetic pulses

摘要

Spin-torque oscillator (STO) read heads with a high data transfer rate for hard disk drives have been proposed. To investigate the oscillation stability and frequency agility of the STO under magnetic pulses, we measured the response waveforms of the STO to a series of sub-nanosecond magnetic pulses and calculated the delay-detection output signal from the STO waveforms. We found that stable oscillation was maintained under the magnetic pulses and that the delay-detection output signal reproduced the applied pulse pattern. The results indicate that the STO read heads can operate at data transfer rates higher than 2 Gbits/s. (C) 2016 The Japan Society of Applied Physics