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Spicer, T. M. ; Durrant, C. J. ; Keatley, P. S. ; Kruglyak, V. V. ; Chen, W. ; Xiao, G. ; Hicken, R. J. ( , Journal of Physics D: Applied Physics)
Abstract Time-resolved Kerr microscopy (TRSKM) has been used to explore the small amplitude picosecond magnetization dynamics induced by spin–orbit torques in a Ta(4 nm)/Co40Fe40B20(1 nm)/MgO(1.6 nm)/Ta(1 nm) Hall bar structure. The time dependent polar magneto optical Kerr effect was recorded following injection of a current pulse of 70 ps duration. Macrospin simulations provide a reasonable description of the precession and a transient background response as the field strength and current polarity are varied, while confirming that the in-plane spin–orbit torque is dominant within this system. Increasing the current density within the simulations leads to coherent magnetization reversal. Inclusion of a modest in-plane bias field is found to reduce both the switching current and the time required for switching. The orientation of the in-plane field relative to the direction of the current determines whether the magnetization can be switched backwards and forwards by current pulses of the same or opposite polarity.
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Zhang, Y. H. ; Xu, H. S. ; Litvinov, Yu. A. ; Tu, X. L. ; Yan, X. L. ; Typel, S. ; Blaum, K. ; Wang, M. ; Zhou, X. H. ; Sun, Y. ; et al ( , Physical Review Letters)
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Abbott, B. P. ; Abbott, R. ; Abbott, T. D. ; Acernese, F. ; Ackley, K. ; Adams, C. ; Adams, T. ; Addesso, P. ; Adhikari, R. X. ; Adya, V. B. ; et al ( , The Astrophysical Journal)