Electric Field Modulation on Special Interfacial Magnetic States in Tetragonal La2/3Sr1/3MnO3/BiFeO3 Heterostructures

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• 作者：Li Yin ; Qian Zhang ; Dong Li ; Wenbo Mi ; Xiaocha Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：July 21, 2016
• 年：2016
• 卷：120
• 期：28
• 页码：15342-15348
• 全文大小：585K
• 年卷期：0
• ISSN：1932-7455

文摘

By first-principles calculations on tetragonal La_2/3Sr_1/3MnO₃(LSMO)/BiFeO₃(BFO) heterostructures, we demonstrate two interfacial couplings, direct and indirect, for achieving the net Fe moment in the first layer of interfacial regions. The direct Fe_–-Mn (indirect Fe₊-O_B-MnO) exchange couplings induce a net Fe moment of 0.55 μ_B (−1.07 μ_B) in MnO₂/Fe–O₂ (MnO₂/O₂–Fe) model, which is parallel(antiparallel) to adjoining Mn around interfaces. Especially, the interfacial net Fe moment in MnO₂/Fe–O₂ model with 100% spin polarization can be reversed into the opposite direction by an electric field. In the spin-valve device, such controllable interfaces will develop a specific magnetic field region, where the external electric field can modulate the high and low magnetoresistances. These results lay foundations for developing energy-efficient spintronics and multifunctional devices.