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arXiv · 2201.09570

Direct observation of strong anomalous Hall effect and proximity-induced ferromagnetic state in SrIrO3

Arun Kumar Jaiswal·Di Wang·Vanessa Wollersen·Rudolf Schneider·Matthieu Le Tacon·Dirk Fuchs
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Abstract

The 5d iridium-based transition metal oxides have gained broad interest because of their strong spin-orbit coupling which favors new or exotic quantum electronic states. On the other hand, they rarely exhibit more mainstream orders like ferromagnetism due to generally weak electron-electron correlation strength. Here, we show a proximity-induced ferromagnetic (FM) state with TC = 100 K and strong magnetocrystalline anisotropy in a SrIrO3 (SIO) heterostructure via interfacial charge transfer by using a ferromagnetic insulator in contact with SIO. Electrical transport allows to selectively probe the FM state of the SIO layer and the direct observation of a strong, intrinsic and positive anomalous Hall effect (AHE). For T < 20 K, the AHE displays unusually large coercive and saturation field, a fingerprint of a strong pseudospin-lattice coupling. A Hall angle, sxyAHE/sxx, larger by an order of magnitude than in typical 3d metals and a FM net moment of about 0.1 mB/Ir, is reported. This emphasizes how efficiently the nontrivial topological band properties of SIO can be manipulated by structural modifications and the exchange interaction with 3d TMOs.

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Arun Kumar Jaiswal, Di Wang, Vanessa Wollersen, Rudolf Schneider, Matthieu Le Tacon, Dirk Fuchs. 2022-01-24. Direct observation of strong anomalous Hall effect and proximity-induced ferromagnetic state in SrIrO3. https://arxiv.org/abs/2201.09570

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