September 2013

Journal

Spin-flop coupling and exchange bias in embedded complex oxide micromagnets

By:
Takamura, Yayoi ; Folven, Eric; Shu, Jonathan; Lukes, Karl; Binzhi, Li; Scholl, Andreas; Young, Anthony; Retterer, Scott T; Tybell, Thomas; Grepstad, Jostein
Journal Name:
Physical Review Letters
Page Number:
107201-1-107201-5
Volume:
111
Issue Number:
10
Publication Date:
September 2013
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.111.107201

Abstract

The magnetic domains of embedded micromagnets defined in epitaxial La0.7Sr0.3MnO3 (LSMO) thin films and LaFeO3/LSMO bilayers were investigated using soft x-ray magnetic microscopy. Square micromagnets with 2 x 2 μm dimensions aligned with their edges parallel to the easy axes of LSMO provide an ideal experimental geometry for probing the influence of interface exchange coupling on the magnetic domain patterns. The observation of unique domain patterns not found in ferromagnetic metal microstructures, namely divergent antiferromagnetic vortex domains and “Z”-type domains, suggests the simultaneous presence of spin-flop coupling and local exchange bias in this system.


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