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https://doi.org/10.1038/ncomms11015
Title: | Long-range magnetic coupling across a polar insulating layer | Authors: | Lü W.M. Saha S. Wang X.R. Liu Z.Q. Gopinadhan K. Annadi A. Zeng S.W. Huang Z. Bao B.C. Cong C.X. Venkatesan M. Yu T. Coey J.M.D. Ariando Venkatesan T. |
Keywords: | ferromagnetic material ferromagnetic oxide unclassified drug coupling electron hysteresis insulation light scattering magnetic field magnetization oscillation Article chemical modification chemical structure Dzyaloshinskii Moriya interaction electron hysteresis insulator element light scattering magnetic field magnetism oscillation thickness |
Issue Date: | 2016 | Publisher: | Nature Publishing Group | Citation: | Lü W.M., Saha S., Wang X.R., Liu Z.Q., Gopinadhan K., Annadi A., Zeng S.W., Huang Z., Bao B.C., Cong C.X., Venkatesan M., Yu T., Coey J.M.D., Ariando, Venkatesan T. (2016). Long-range magnetic coupling across a polar insulating layer. Nature Communications 7 : 11015. ScholarBank@NUS Repository. https://doi.org/10.1038/ncomms11015 | Abstract: | Magnetic interactions in solids are normally mediated by short-range exchange or weak dipole fields. Here we report a magnetic interaction that can propagate over long distances (?10 nm) across a polar insulating oxide spacer. Evidence includes oscillations of magnetization, coercivity and field-cooled loop shift with the thickness of LaAlO3 in La 0.67 Sr 0.33 MnO3 /LaAlO3 /SrTiO3 heterostructures. Similar modifications of the hysteresis loop appear when two coupled films of La 0.67 Sr 0.33 MnO3 are separated by LaAlO3, or another polar insulator, but they are absent when the oxide spacer layer is nonpolar. The loop shift is attributed to strong spin-orbit coupling and Dzyaloshinskii-Moriya interaction at the interfaces. There is evidence from inelastic light scattering that the polar spacer mediates long-range transmission of orbital magnetization. This coupling mechanism is expected to apply for any conducting ferromagnetic oxide with mixed valence; in view of electron hopping frequency involved, it raises the prospect of terahertz tunability of magnetic coupling. | Source Title: | Nature Communications | URI: | https://scholarbank.nus.edu.sg/handle/10635/174983 | ISSN: | 20411723 | DOI: | 10.1038/ncomms11015 |
Appears in Collections: | Elements Staff Publications |
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