Ultrafast Time Resolved Photoinduced Magnetization Rotation in a Ferromagnetic/Antiferromagnetic Exchange Coupled System
Ultrafast Time Resolved Photoinduced Magnetization Rotation in a Ferromagnetic/Antiferromagnetic Exchange Coupled System
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DOI：
10.1103/physrevlett.82.3705
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发表时间：
1999-05
影响因子：
8.6
通讯作者：
G. Ju;A. Nurmikko;R. Farrow;R. Marks;M. Carey;B. Gurney
中科院分区：
文献类型：
--
作者：
G. Ju;A. Nurmikko;R. Farrow;R. Marks;M. Carey;B. Gurney
应用超短脉冲激光技术研究了交换偏置铁磁/反铁磁（FM/AF）双层薄膜（NiFe/NiO）的光诱导调制。亚皮秒激光脉冲对调频/自动对焦界面进行光激发，可在超短时间尺度上引起单向交换偏置场（H ex）的大调制。交换偏置的“解钉”导致坡莫合金薄膜中的相干磁化旋转，这是实验时间分辨的，对应于磁化分量（Δ M Z/M S ~ 0.5）在100 psec的时间尺度上的大调制。
Ultrashort pulse laser techniques are applied to study optically induced modulation in exchange biased ferromagnetic/antiferromagnetic (FM/AF) thin bilayer films (NiFe/NiO). Photoexcitation of the FM/AF interface with subpicosecond laser pulses induces large modulation in the unidirectional exchange bias field (H ex) on an ultrashort time scale. The “unpinning” of the exchange bias leads to coherent magnetization rotation in the permalloy film which is time resolved by the experiment and corresponds to a large modulation in the magnetization component (Δ M Z/M S∼ 0.5), on a time scale of 100 psec.