Origin of anomalous hysteresis loops induced by femtosecond laser pulses in GdFeCo amorphous films

Origin of anomalous hysteresis loops induced by femtosecond laser pulses in GdFeCo amorphous films
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GdFeCo 非晶薄膜中飞秒激光脉冲引起的异常磁滞回线的起源

DOI:
10.1063/1.3339878
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发表时间:
2010-03
影响因子:
4
通讯作者:
Lai, Tianshu
Lai, Tianshu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xu, Chudong;Chen, Zhifeng;Chen, Daxin;Zhou, Shiming;Lai, Tianshu

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开发了一种与初始化场扫描方法相结合的可控泵浦脉冲数磁光克尔技术,以分别消除和识别来自外部场历史和多个脉冲激励的记忆效应和累积效应。利用该技术对不同数量的泵浦脉冲测量了一系列GdFeCo薄膜的反常磁滞回线,揭示了连续脉冲泵浦的反常磁滞回线存在严重的记忆和累积效应,显示出热矫顽力和磁化反转程度的虚假信息。单脉冲诱发的反常环表明,连续脉冲泵浦反常环所表现出的热矫顽力并不是驱动真实磁光记录的最小外场。
A controllable pump-pulse-number magneto-optical Kerr technique combined with an initializing field scanning approach is developed to eliminate and identify memory and accumulation effects, respectively, from external field history and multiple pulse excitations. A series of anomalous loops of GdFeCo films are measured for different amount of pump pulses using this technique, revealing that serious memory and accumulation effects exist in continuous-pulse-pumped anomalous hysteresis loops which show illusory information of hot coercivity and degree of magnetization reversal. Single-pulse-induced anomalous loop reveals that the hot coercivity shown by continuous-pulse-pumped anomalous loops is not the minimum external field that drives real magneto-optical recording.
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