Direct Observation of Strong Anomalous Hall Effect and Proximity-Induced Ferromagnetic State in SrIrO<sub>3</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 35080789.
- Also identified by DOI 10.1002/adma.202109163.
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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, a proximity-induced ferromagnetic (FM) state with T<sub>C</sub> ≈ 100 K and strong magnetocrystalline anisotropy is shown in a SrIrO<sub>3</sub> (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, σ<sub>xy</sub> <sup>AHE</sup> /σ<sub>xx</sub> <sub>,</sub> larger by an order of magnitude than in typical 3d metals and an FM net moment of about 0.1 μ<sub>B</sub> /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.