高场扫描率下FeNi/Cu/Co/FeMn自旋阀交换偏置的训练和恢复行为
Training and recovery behaviours of exchange bias in FeNi/Cu/Co/FeMn spin valves at high field sweep rates
摘要：
用磁电阻曲线研究了FeNi/Cu/Co/FeMn自旋阀中交换偏置的训练和恢复。结果表明，交换场的训练和恢复分别与训练周期和恢复时间的对数成正比。这些行为的解释内的模型的基础上热激活。在磁场扫描速率为1000、2000和4000 Oe/s时，反铁磁自旋的弛豫时间分别为61.4、27.6和11.5（单位：$ms$），比常规磁强计测量的长弛豫时间（~10^2 s）短得多。
英文摘要：
Training and recovery of exchange bias in FeNi/Cu/Co/FeMn spin valves have been studied by magnetoresistance curves with field sweep rates from 1000 to 4800 Oe/s. It is found that training and recovery of exchange field are proportional to the logarithm of the training cycles and recovery time, respectively. These behaviours are explained within the model based on thermal activation. For the field sweep rates of 1000, 2000 and 4000 Oe/s, the relaxation time of antiferromagnet spins are 61.4, 27.6, and 11.5 in the unit of $ms$ respectively, much shorter than the long relaxation time (~10^2 s) in conventional magnetometry measurements.
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