Optical imaging of antiferromagnetic domains in ultrathin CoO(001) films

Optical imaging of antiferromagnetic domains in ultrathin CoO(001) films
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超薄 CoO(001) 薄膜中反铁磁畴的光学成像

DOI:
10.1088/1367-2630/aba1b4
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发表时间:
2020-03
影响因子:
3.3
通讯作者:
Wu Yizheng
Wu Yizheng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xu Jia;Chen Haoran;Zhou Chao;Shi Dong;Chen Gong;Wu Yizheng

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利用磁光双折射效应,利用宽场光学显微镜对CoCoO(001)薄膜中的反铁磁畴进行了成像。通过Fe/CoO(001)双层膜中交换耦合的自旋取向操纵证实了观测到的光学对比度的磁性起源。通过对CoO单晶薄膜的双折射衬度随厚度和温度变化的测量,揭示了CoO单晶薄膜有序化温度的有限尺寸效应。发现磁光双折射效应强烈依赖于入射光的光子能量,并且在蓝光源下从4.6 nm CoO薄膜获得了高达168.5 mdeg的大偏振旋转角,这使得进一步研究AFM双折射薄膜中AFM畴在外场下的演化成为可能.
Antiferromagnetic (AFM) domains in ultrathin CoO(001) films are imaged by a wide-field optical microscopy using magneto-optical birefringence effect. The magnetic origin of observed optical contrast is confirmed by the spin orientation manipulation through exchange coupling in Fe/CoO(001) bilayer. The finite size effect of ordering temperature for ultrathin single crystal CoO film is revealed by the thickness and temperature dependent measurement of birefringence contrast. The magneto-optical birefringence effect is found to strongly depend on the photon energy of incident light, and a surprising large polarization rotation angle up to 168.5 mdeg is obtained from a 4.6 nm CoO film with a blue light source, making it possible to further investigate the evolution of AFM domains in AFM ultrathin film under external field.
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发表时间: 2017-10
期刊: Annals of Physics
影响因子: 3
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