Science Daily March 9, 2021
Researchers in Japan analyzed the operation of the flux-control (FC) device by measuring the temporal resistance change in the sub-nanosecond region. They showed that the reversal of the FC device becomes faster as the bias current is increased and can be completed by 0.5 ns after the transition of the write current. They reproduced the experimental results by micromagnetic simulations using a head model, confirming that the simulations correctly describe the magnetization dynamics of the actual device. The simulations showed that the recording field gain by the FC device appears with little delay after the rise of the recording field and it operates effectively even at a fast write rate of approximately 3 Gbit/s. They demonstrated the effectiveness of boosting the bias current, which can realize both fast and reliable operation of the FC device. These results indicate that the FC device operates as designed and that microwave-assisted magnetic recording using the FC effect is promising for extending the recording density of hard disk drives…read more. Open Access TECHNICAL ARTICLE
Schematic of a typical FC device structure. Credit: Journal of Applied Physics 129, 103901 (2021)