Strain-tunable magnetic properties of epitaxial lithium ferrite thin film on MgAl2O4 substrates
Strain-tunable magnetic properties of epitaxial lithium ferrite thin film on MgAl2O4 substrates
复制标题
MgAl2O4 基底上外延锂铁氧体薄膜的应变可调磁性能
DOI：
10.1039/c5tc00099h
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发表时间：
2015-01-01
影响因子：
6.4
通讯作者：
Wang, Hong
中科院分区：
文献类型：
--
作者：
Zhang, Ruyi;Liu, Ming;Wang, Hong
采用高压溅射法在（001）MgAl 2 O 4衬底上制备了不同厚度的LiFe 5 O 8外延薄膜。所有的LiFe 5 O 8薄膜都具有良好的外延质量，具有有序的α-LiFe 5 O 8结构，并且通过减小膜厚可以获得更大的面内压应变和面外张应变。此外，面内压应变能显著增强面内磁化强度，而面外张应变则会降低面外磁化强度。研究表明，控制薄膜厚度是调控界面应变进而改善外延LiFe 5 O 8薄膜磁性能的有效方法。
Epitaxial LiFe5O8 thin films with various thicknesses were fabricated on (001) MgAl2O4 substrates by using a high-pressure sputtering system. All the LiFe5O8 thin films have excellent epitaxial quality with ordered alpha-LiFe5O8 structure, and larger in-plane compressive and out-of-plane tensile strain can be obtained by decreasing the film thickness. Moreover, the in-plane compressive strain can significantly induce the enhancement of in-plane magnetization while the out-of-plane tensile strain tends to reduce the out-of-plane magnetization. It indicates that controlling the thickness of the films is an effective method to tailor the interface strain and further modify the magnetic properties of the epitaxial LiFe5O8 thin films.