Orbital rearrangement mechanism and half-metallicity transition in strained Fe3O4/BaTiO3 interfaces

Orbital rearrangement mechanism and half-metallicity transition in strained Fe3O4/BaTiO3 interfaces
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应变 Fe3O4/BaTiO3 界面中的轨道重排机制和半金属性转变

DOI:
10.1016/j.commatsci.2017.05.036
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发表时间:
2017-09
影响因子:
3.3
通讯作者:
Zunfeng Du
Zunfeng Du
中科院分区:
材料科学3区
文献类型:
--
作者:
Xueyao Hou;Li Yin;Wenbo Mi;Zunfeng Du

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双轴应变效应是影响纳米薄膜界面性能的重要因素之一。用第一性原理计算研究了应变Fe3O4/ batio3异质结构的可调谐电子特性。计算中考虑了两种模型(OTi-FeBO和TiO-FeBO),这两种模型在铁电BaTiO3极化方向上是不同的。在应变的OTi-FeBO中发现了可调节的半金属丰度和界面层的轨道重排。HM到绝缘体的转变可以归因于界面相互作用的轨道重排。研究了不同双轴应变对界面性能的影响,提出了不同应变下HM向绝缘子转变的机理。该研究对铁电存储器的应用具有重要意义。
Biaxial-strain effect emerges as one of leading topics for the strong influence on interfacial properties of nanoscale thin films. The tunable electronic characteristics in strained Fe3O4/BaTiO3heterostructure have been investigated by first-principles calculation. Two models (OTi-FeBO and TiO-FeBO) are considered in the calculation, which is different in polarization directions of ferroelectric BaTiO3. Tunable half-metallicity (HM) and orbital rearrangement of interfacial layers are found in strained OTi-FeBO. The HM to insulator transition can be attributed to the orbital rearrangement of interfacial interaction. The interfacial properties are modulated by different biaxial-strains and the HM to insulator transition mechanism at different strain is proposed. The research is useful in ferroelectric memories application.
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影响因子: 16.6
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