D0 ferromagnetic interface between nonmagnetic perovskites

R. Oja, M. Tyunina, L. Yao, T. Pinomaa, T. Kocourek, A. Dejneka, O. Stupakov, M. Jelinek, V. Trepakov, S. Van Dijken, R. M. Nieminen

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)

Abstract

We use computational and experimental methods to study d0 ferromagnetism at a charge-imbalanced interface between two perovskites. In SrTiO 3/KTaO 3 superlattice calculations, the charge imbalance introduces holes in the SrTiO 3 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 SrTiO 3/KTaO 3, SrTiO 3/KNbO 3, and SrTiO 3/NaNbO 3 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 t 1g band in comparison with the more studied d band t 2g symmetry electron gas.

Original languageEnglish
Article number127207
JournalPhysical Review Letters
Volume109
Issue number12
DOIs
Publication statusPublished - Sep 2012
MoE publication typeA1 Journal article-refereed

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