Independent Control of the Magnetization in Ferromagnetic La2/3Sr1/3MnO3/SrTiO3/LaCoO3 Heterostructures Achieved by Epitaxial Lattice Mismatch

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• 作者：Beatriz Rivas-Murias ; Irene Lucas ; Pilar Jiménez-Cavero ; César Magén ; Luis Morellón ; Francisco Rivadulla
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1736-1740
• 全文大小：367K
• ISSN：1530-6992

文摘

We report the effect of interface symmetry-mismatch on the magnetic properties of LaCoO₃ (LCO) thin films. Growing epitaxial LCO under tensile strain on top of cubic SrTiO₃ (STO) produces a contraction along the c axis and a characteristic ferromagnetic response. However, we report here that ferromagnetism in LCO is completely suppressed when grown on top of a buffer layer of rhombohedral La_2/3Sr_1/3MnO₃ (LSMO), in spite of identical in-plane and out-of-plane lattice deformation. This confirms that it is the lattice symmetry mismatch and not just the total strain, which determines the magnetism of LCO. On the basis of this control over the magnetic properties of LCO, we designed a multilayered structure to achieve independent rotation of the magnetization in ferromagnetic insulating LCO and half-metallic ferromagnet LSMO. This is an important step forward for the design of spin-filtering tunnel barriers based on LCO.