Light-modulated ferromagnetism of strained NiFe2O4 nanocrystals
Light-modulated ferromagnetism of strained NiFe2O4 nanocrystals
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DOI：
10.1016/j.ceramint.2019.04.022
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发表时间：
2019-07
影响因子：
5.2
通讯作者：
Hang Zhou;Zhiwei An;C. Yuan;Xingfang Luo
中科院分区：
文献类型：
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作者：
Hang Zhou;Zhiwei An;C. Yuan;Xingfang Luo
光的低能耗为磁调制提供了一种潜在的途径，可用于发展光磁耦合器件、数据存储技术和量子计算技术。本工作合成了非磁性氧化铝薄膜中具有反尖晶石结构的NiFe2O4纳米晶。通过理论计算和实验验证，发现NiFe2O4纳米晶在Al_2O_3薄膜中存在压缩应变。压缩应变可以部分松弛，导致在应变NiFe2O4纳米晶表面形成无序层，这为磁光学调制提供了理想的平台。在应变的NiFe2O4纳米晶中观察到了显著的光调制铁磁性。这项工作展示了一种新的方法来光学工程铁磁特性，以应用于下一代磁性纳米器件。
Light provides a potential approach to modulate magnetism due to the low energy consumption, which could be used for the development of optical-magnetic coupling devices, data storage technology and quantum computation technology. In this work, NiFe2O4nanocrystals with inverse spinel structure confined in non-magnetic Al2O3film are synthesized. Based on theoretical calculation and experimental validation, it is revealed that the NiFe2O4nanocrystals experience compressive strain from Al2O3film. The compressive strain can be partially relaxed, leading to the formation of disorder layers at the surfaces of strained NiFe2O4nanocrystals, which provide an ideal platform to modulate magnetism optically. A remarkable light-modulated ferromagnetism in the strained NiFe2O4nanocrystals is observed. This work demonstrates a novel approach to optically engineer the ferromagnetic properties for applications in next generation of magnetic nano-devices.