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Tuning oxygen vacancy concentrations is a well-established approach to controlling properties of complex oxides. Recent work on perovskite cobaltites has shown that ordering of oxygen vacancies can also be tuned, via heteroepitaxial strain, presenting new opportunities. Here we demonstrate that strain-engineered vacancy ordering can control and enhance magnetic anisotropy in La1-xSrxCoO3-δ. In particular, in-plane oxygen vacancy order induced by compressive strain is shown to result in remarkably strong perpendicular magnetic anisotropy, with anisotropy constant up to 6×106erg/cm3. The anisotropy is thickness independent, ruling out surface and film/substrate interface anisotropy, but strongly correlated with lateral coherence of defect order from electron microscopy. The results are discussed in terms of the unit-cell-level superlattice induced by the oxygen vacancy order, generating intriguing analogies with metal-based multilayer systems. Generally, this Rapid Communication highlights the significant potential of strain-based manipulation of oxygen vacancy ordering to control and enhance complex oxide properties.
Bibliographical noteFunding Information:
This work was primarily supported by the U.S. Department of Energy (DOE) through the University of Minnesota (UMN) Center for Quantum Materials, under Grants No. DE-FG02-06ER46275 and No. DE-SC-0016371. Parts of this work were carried out in the Characterization Facility, UMN, which receives partial support from National Science Foundation through the Materials Research Science and Engineering Center program. This research also used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated by Argonne National Laboratory under Grant No. DE-AC02-06CH11357. Electron microscopy observations were carried out at the Centro Nacional de Microscopía Electrónica (Universidad Complutense de Madrid, Spain). Financial support from the Spanish MINECO/FEDER through Grant No. MAT2015-066888-C3-3-R is acknowledged by M.V. and M.C.
© 2018 American Physical Society.
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