Please use this identifier to cite or link to this item: 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
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