title: Independent Control of the Magnetization in Ferromagnetic La2/3Sr1/3MnO3/SrTiO3/LaCoO3 Heterostructures Achieved by Epitaxial Lattice Mismatch.
abstract: 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 La2/3Sr1/3MnO3 (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.
authors.affiliation: Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela , 15782 Santiago de Compostela, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Rivas-Murias
authors.affiliation: Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Mariano Esquillor , Edificio I+D, 50018 Zaragoza, Spain.|Departamento Física de la Materia Condensada, Universidad de Zaragoza , Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Irene
authors.initials: I
authors.lastname: Lucas
authors.affiliation: Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Mariano Esquillor , Edificio I+D, 50018 Zaragoza, Spain.|Departamento Física de la Materia Condensada, Universidad de Zaragoza , Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Jiménez-Cavero
authors.affiliation: Departamento Física de la Materia Condensada, Universidad de Zaragoza , Pedro Cerbuna 12, 50009 Zaragoza, Spain.|Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA) , Mariano Esquillor, Edificio I+D, 50018 Zaragoza, Spain.|Fundación ARAID , 50018 Zaragoza, Spain.
authors.forename: César
authors.initials: C
authors.lastname: Magén
authors.affiliation: Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Mariano Esquillor , Edificio I+D, 50018 Zaragoza, Spain.|Departamento Física de la Materia Condensada, Universidad de Zaragoza , Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Morellón
authors.affiliation: Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela , 15782 Santiago de Compostela, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Rivadulla
keywords: LaCoO3; epitaxial multilayers; exchange-bias; ferromagnetic-insulator; spin-filter tunnel junction; thin-film