Temperature dependence of ferromagnet-antiferromagnet spin alignment and coercivity in epitaxial micromagnet bilayers

Lee, Michael S.; Wynn, Thomas A.; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Retterer, Scott T.; Grepstad, Jostein K.; Takamura, Yayoi

doi:10.1103/PhysRevMaterials.1.014402

Title: Temperature dependence of ferromagnet-antiferromagnet spin alignment and coercivity in epitaxial micromagnet bilayers

Journal Article · Mon Jun 26 04:00:00 UTC 2017 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.1.014402 · OSTI ID:1394595

Lee, Michael S. ^[1]; Wynn, Thomas A. ^[1]; Folven, Erik ^[2]; Chopdekar, Rajesh V. ^[1]; Scholl, Andreas ^[3];

^[4]; Grepstad, Jostein K. ^[2]; Takamura, Yayoi ^[1]

Univ. of California, Davis, CA (United States)
Norwegian Univ. of Science and Technology, Trondheim (Norway)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this paper, soft x-ray photoemission electron microscopy with an in situ magnetic field has been used to study the relationship between ferromagnetic and antiferromagnetic spin alignment and the switching/reversal field of epitaxial micromagnetic structures. We investigated a model system consisting of a bilayer of ferromagnetic La_0.7Sr_0.3MnO₃ and antiferromagnetic LaFeO₃ where the spin axes in each layer can be driven from mutually perpendicular (spin-flop) to parallel alignment by varying the temperature between 30 and 300 K. Results show that not only does this spin alignment noticeably influence the bilayer micromagnet coercivity compared to La_0.7Sr_0.3MnO₃ single-layer micromagnets, but the coercivity within this materials system can be tuned over a wide range by careful balance of material properties.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1394595

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 1 Vol. 1; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Magnetic domain formation in ultrathin complex oxide ferromagnetic/antiferromagnetic bilayers Bang, A. D.; Olsen, F. K.; Slöetjes, S. D. Applied Physics Letters, Vol. 113, Issue 13 https://doi.org/10.1063/1.5047271	journal	September 2018
Néel vector reorientation in ferromagnetic/antiferromagnetic complex oxide nanostructures Bang, A. D.; Hallsteinsen, I.; Olsen, F. K. Applied Physics Letters, Vol. 114, Issue 19 https://doi.org/10.1063/1.5094604	journal	May 2019
Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures Bang, A. D.; Hallsteinsen, I.; Chopdekar, R. V. Applied Physics Letters, Vol. 115, Issue 11 https://doi.org/10.1063/1.5116806	journal	September 2019

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