Magnetic domain engineering in ferromagnetic thin films is a very important route toward the rational design of spintronics and memory devices. Although the magnetic domain formation has been extensively studied, artificial control of magnetic domain remains challenging. Here, we present the control of magnetic domain formation in paradigmatic SrRuO3/SrTiO3 heterostructures via structural domain engineering. The formation of structural twin domains in SrRuO3 films can be well controlled by breaking the SrTiO3 substrate symmetry through engineering miscut direction. The combination of x-ray diffraction analysis of structural twin domains and magnetic imaging of reversal process demonstrates a one-to-one correspondence between structural domains and magnetic domains, which results in multi-step magnetization switching and anomalous Hall effect in films with twin domains. Our work sheds light on the control of the magnetic domain formation via structural domain engineering, which will pave a path toward desired properties and devices applications.
The discovery of an infinite layer nickelate superconductor in 2019 provided a perfect ending to the long race of searching nearly 30 years for a cuprate analog and at the same time marks a new era of nickel-based superconductivity. The similarities and differences between nickelates and cuprates provide great opportunities for us to reveal the origin of high-Tc superconductivity. Therefore, the observation of nickelate superconductivity is now motivating tremendous efforts to look into this new superconducting family from both aspects of experiment and theory. Here, we give an early perspective on the superconductivity in nickelates, including (1) the theoretical explorations and main conclusions in the past; (2) the newly discovered superconductor R1−xSrxNiO2, in terms of its synthesis, electronic structure, and comparison with cuprates; and (3) the future perspectives of nickelate superconductivity.
The weakly correlated nature of 5d oxide SrIrO3 determines its rare ferromagnetism, and the control of its magnetic order is even less studied. Tailoring structure distortion is currently a main route to tune the magnetic order of 5d iridates, but only for the spatially confined insulating counterparts. Here, we have realized ferromagnetic order in metallic SrIrO3 by construction of SrIrO3/ferromagnetic-insulator (LaCoO3) superlattices, which reveal a giant coercivity of ∼10 T and saturation field of ∼25 T with strong perpendicular magnetic anisotropy. The Curie temperature of SrIrO3 can be controlled by engineering interface charge transfer, which is confirmed by Hall effect measurements collaborating with EELS and XAS. Besides, the noncoplanar spin texture is captured, which is caused by interfacial Dzyaloshinskii-Moriya interactions as well. These results indicate controllable itinerant ferromagnetism and an emergent topological magnetic state in strong spin–orbit coupled semimetal SrIrO3, showing great potential to develop efficient spintronic devices.
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