d0 Ferromagnetic Interface between Nonmagnetic Perovskites

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2012

Department

Department of Applied Physics

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Mcode

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Language

en

Pages

5

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Physical Review Letters, Volume 109, issue 12, pp. 1-5

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

ferromagnetism, interface, perovskites

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DOI

10.1103/PhysRevLett.109.127207

Citation

Oja, R, Tyunina, M, Yao, L, Pinomaa, T, Kocourek, T, Dejneka, A, Stupakov, O, Jelinek, M, Trepakov, V, van Dijken, S & Nieminen, R M 2012, 'd 0 Ferromagnetic Interface between Nonmagnetic Perovskites', Physical Review Letters, vol. 109, no. 12, 127207, pp. 1-5. https://doi.org/10.1103/PhysRevLett.109.127207

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https://urn.fi/URN:NBN:fi:aalto-202510087598

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[article-cris] Perustieteiden korkeakoulu / SCI