Current-induced picosecond magnetization dynamics in a Ta/CoFeB/MgO hall bar
Current-induced picosecond magnetization dynamics in a Ta/CoFeB/MgO hall bar
复制标题
Ta/CoFeB/MgO 霍尔棒中的电流感应皮秒磁化动力学
DOI:
10.1088/1361-6463/ab2693
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Spicer T
中科院分区:
文献类型:
--
作者:
Spicer T
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)/Co 40 Fe 40 B 20 (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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影响因子:
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作者:
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影响因子:
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作者:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
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通讯作者:
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