Magnetic Anisotropy of a Quasi Two-Dimensional Canted Antiferromagnet
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Abstract
We report the control of the interplane magnetic exchange coupling in CaIrO3 perovskite thin films and superlattices with SrTiO3. By analyzing the anisotropic magneto-transport data, we demonstrate that a semimetallic paramagnetic CaIrO3 turns into a canted antiferromagnetic Mott insulator at reduced dimensions. The emergence of a biaxial magneto-crystalline anisotropy indicates the canted moment responding to the cubic symmetry. Extending to superlattices and probing oxygen octahedral rotation by half-integer X-ray Braggs diffraction, a more complete picture about the canted moment evolution with interplane coupling can be understood. Remarkably, a rotation of the canted moments' easy axes by 45ø is also observed by a sign reversal of the in-plane strain. These results demonstrate the robustness of anisotropic magnetoresistance in revealing quasi two-dimensional canted antiferromagnets, as well as valuable insights about quadrupolar magnetoelastic coupling, relevant for designing future antiferromagnetic spintronic devices. Copyright © 2020 American Chemical Society.
Keywords
2D-antiferromagnet, Anisotropic magnetoresistance, Cairo3, Magnetic phase transition, Magnetoelastic coupling, Pseudospin quadrupoles
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NANO LETTERS
Publisher
American Chemical Society
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Date
2020-01-31
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Article