Atomic order of rare earth ions in a complex oxide: a path to magnetotaxial anisotropy

Allison C. Kaczmarek (), Ethan R. Rosenberg, Yixuan Song, Kevin Ye, Gavin A. Winter, Aubrey N. Penn, Rafael Gomez-Bombarelli, Geoffrey S. D. Beach and Caroline A. Ross
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Allison C. Kaczmarek: Massachusetts Institute of Technology
Ethan R. Rosenberg: Massachusetts Institute of Technology
Yixuan Song: Massachusetts Institute of Technology
Kevin Ye: Massachusetts Institute of Technology
Gavin A. Winter: Massachusetts Institute of Technology
Aubrey N. Penn: Massachusetts Institute of Technology
Rafael Gomez-Bombarelli: Massachusetts Institute of Technology
Geoffrey S. D. Beach: Massachusetts Institute of Technology
Caroline A. Ross: Massachusetts Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Complex oxides offer rich magnetic and electronic behavior intimately tied to the composition and arrangement of cations within the structure. Rare earth iron garnet films exhibit an anisotropy along the growth direction which has long been theorized to originate from the ordering of different cations on the same crystallographic site. Here, we directly demonstrate the three-dimensional ordering of rare earth ions in pulsed laser deposited (EuxTm1-x)3Fe5O12 garnet thin films using both atomically-resolved elemental mapping to visualize cation ordering and X-ray diffraction to detect the resulting order superlattice reflection. We quantify the resulting ordering-induced ‘magnetotaxial’ anisotropy as a function of Eu:Tm ratio using transport measurements, showing an overwhelmingly dominant contribution from magnetotaxial anisotropy that reaches 30 kJ m−3 for garnets with x = 0.5. Control of cation ordering on inequivalent sites provides a strategy to control matter on the atomic level and to engineer the magnetic properties of complex oxides.

Date: 2024
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DOI: 10.1038/s41467-024-49398-4

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