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Temperature and Orientation Dependent Exchange Coupling in Epitaxial Oxide Micromagnets

Lee, Michael S.; Wynn, Thomas A.; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Retterer, Scott; Grepstad, Jostein; Takamura, Yayoi
Journal article, Peer reviewed
Published version
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URI
http://hdl.handle.net/11250/2495997
Date
2017
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  • Institutt for elektroniske systemer [1555]
  • Publikasjoner fra CRIStin - NTNU [21000]
Original version
10.1103/PhysRevMaterials.1.014402
Abstract
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 La0.7Sr0.3MnO3 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 La0.7Sr0.3MnO3 single-layer micromagnets, but the coercivity within this materials system can be tuned over a wide range by careful balance of material properties.
Publisher
American Physical Society
Journal
PHYSICAL REVIEW MATERIALS

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