d0 Ferromagnetic Interface between Nonmagnetic Perovskites

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© 2012 American Physical Society (APS). This is the accepted version of the following article: Oja, R. & Tyunina, M. & Yao, L. & Pinomaa, T. & Kocourek, T. & Dejneka, A. & Stupakov, O. & Jelinek, M. & Trepakov, V. & van Dijken, S. & Nieminen, Risto M. 2012. d0 Ferromagnetic Interface between Nonmagnetic Perovskites. Physical Review Letters. Volume 109, Issue 12. 127207/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.109.127207, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.109.127207.

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Journal Title

Journal ISSN

Volume Title

School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2012

Major/Subject

Mcode

Degree programme

Language

en

Pages

127207/1-5

Series

Physical Review Letters, Volume 109, Issue 12

Abstract

We use computational and experimental methods to study d0 ferromagnetism at a charge-imbalanced interface between two perovskites. In SrTiO3/KTaO3 superlattice calculations, the charge imbalance introduces holes in the SrTiO3 layer, inducing a d0 ferromagnetic half-metallic 2D hole gas at the interface oxygen 2p orbitals. The charge imbalance overrides doping by vacancies at realistic concentrations. Varying the constituent materials shows ferromagnetism to be a general property of hole-type d0 perovskite interfaces. Atomically sharp epitaxial d0 SrTiO3/KTaO3, SrTiO3/KNbO3, and SrTiO3/NaNbO3 interfaces are found to exhibit ferromagnetic hysteresis at room temperature. We suggest that the behavior is due to the high density of states and exchange coupling at the oxygen t1g band in comparison with the more studied d band t2g symmetry electron gas.

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Keywords

perovskites, ferromagnetism

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Citation

Oja, R. & Tyunina, M. & Yao, L. & Pinomaa, T. & Kocourek, T. & Dejneka, A. & Stupakov, O. & Jelinek, M. & Trepakov, V. & van Dijken, S. & Nieminen, Risto M. 2012. d0 Ferromagnetic Interface between Nonmagnetic Perovskites. Physical Review Letters. Volume 109, Issue 12. 127207/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.109.127207.