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Near Room-Temperature Ferromagnetic Phase Achieved in 4d Ruthenate via Interfacial Ferrimagnetic Coupling and
Mengqin Wang1,2, Qinghua Zhang1,2, Xiao Deng3
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Abstract:
Transition metal oxides (TMOs) simultaneously possessing strong spin-orbit coupling, near room-temperature ferromagnetism, and excellent conductivity are scarce while they show great potential applications in oxide spintronics. Here, a TMO with all these features is reported, existing as an interfacial phase in the 4d Ca0.5Sr0.5RuO3 layer sandwiched by two LaMnO3 layers. This phase is well conductive and ferromagnetic in a wide temperature range, with the highest Curie temperature of ≈275 K among the 4d/5d-TMOs. Particularly, this interfacial phase shows a considerably improved saturation magnetization (≈2 µB/Ru, twice that of the bulk counterpart), and a greatly reduced coercive force. All these features are highly desired by the application of spin-orbit torque. Due to the presence of strong spin-orbit coupling, such a Ca0.5Sr0.5RuO3 interfacial phase exhibits a significantly larger anomalous Hall conductivity than the typical 3d oxide ferromagnet La2/3Sr1/3MnO3 near room temperature. Analyses based on the techniques of X-ray magnetic circular dichroism, polarized-neutron reflectometry, and scanning transmission electron microscopy reveal a magnetic exchange interaction between the interfacial phases of Ca0.5Sr0.5RuO3 and LaMnO3 and an obvious expansion of the interfacial Mn─O─Mn bond angle, stabilizing the high-temperature ferromagnetic state of the CSRO/LMO interface.
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