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- W2907794654 abstract "Recently, a high mobility quasi-two-dimensional electron gas has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al2O3 and perovskite SrTiO3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl2O4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl2O4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although FeAl2O4/STO is insulating, the NiAl2O4/STO and CoAl2O4/STO heterointerfaces are found to be highly metallic and exhibit the anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 104 cm2 V−1 s−1, comparable to that of the γ-Al2O3/STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al2O3/STO at temperatures below 5 K, while the enhanced AHE in NiAl2O4/STO and CoAl2O4/STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl2O4 spinel films." @default.
- W2907794654 created "2019-01-11" @default.
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- W2907794654 date "2018-12-24" @default.
- W2907794654 modified "2023-10-16" @default.
- W2907794654 title "Metallic conduction and ferromagnetism in <i>M</i>Al2O4/SrTiO3 spinel/perovskite heterostructures (<i>M</i> = Fe, Co, Ni)" @default.
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- W2907794654 doi "https://doi.org/10.1063/1.5063540" @default.
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