Ha Thai Duy, Chen Jia-Wei, Yen Min, Lai Yu-Hong, Wang Bing-Yi, Chin Yi-Ying, Wu Wen-Bin, Lin Hong-Ji, Juang Jenh-Yih, Chu Ying-Hao
Department of Electrophyics, National Chiao Tung University, Hsinchu 30010, Taiwan.
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
ACS Appl Mater Interfaces. 2020 Oct 14;12(41):46874-46882. doi: 10.1021/acsami.0c11475. Epub 2020 Sep 30.
Epitaxial CoFeO(CFO)/CoO bilayers were fabricated by pulsed laser deposition on flexible muscovite mica substrate. Samples with different CFO thicknesses were employed to study the phenomenon of exchange bias involving strongly anisotropic ferromagnet. Magnetic measurements exhibited great enhancement in the features of exchange bias. Raman and X-ray absorption spectroscopies indicated that a new phase emerged within the CFO layer because of the cation charge redistribution in CFO layer under bending, which in turn gave rise to anomalous hysteresis loops exhibited in the bent bilayers. These results provide a fundamental understanding about the mechanisms of exchange bias prevailing in these bilayers and call attention to the implementation of spintronic devices using flexible heterostructures such as the present CFO/CoO bilayers.
通过脉冲激光沉积在柔性白云母衬底上制备了外延CoFeO（CFO）/CoO双层膜。采用不同CFO厚度的样品来研究涉及强各向异性铁磁体的交换偏置现象。磁性测量结果表明交换偏置特性有显著增强。拉曼光谱和X射线吸收光谱表明，由于弯曲状态下CFO层中的阳离子电荷重新分布，CFO层内出现了一个新相，这反过来又导致了弯曲双层膜中出现异常磁滞回线。这些结果为理解这些双层膜中存在的交换偏置机制提供了基础认识，并促使人们关注使用诸如当前CFO/CoO双层膜这样的柔性异质结构来实现自旋电子器件。
