Metallic Conduction and Ferromagnetism in MAl2O4/SrTiO3 Spinel/Perovskite Heterostructures (M=Fe, Co, Ni)

Yu Zhang, Yulin Gan, Hongrui Zhang, Hui Zhang, Poul Norby, Baogen Shen, Jirong Sun, Yunzhong Chen*

*Corresponding author for this work

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Abstract

Recently, a high mobility quasi-two-dimensional electron gas (q-2DEG) 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 the FeAl2O4/STO is insulating, the NiAl2O4/STO and CoAl2O4/STO heterointerfaces are found to be highly metallic and exhibit anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 104 cm2V-1s-1, comparable to that of 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.

 

Original languageEnglish
Article number261603
JournalApplied Physics Letters
Volume113
Issue number26
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2018

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