Link between perpendicular coupling and exchange biasing in Fe3O4/CoO multilayers
Abstract
In studying well-characterized, exchange-biased Fe3O4/CoO superlattices, we demonstrate a causal link between the exchange bias effect and the perpendicular coupling of the ferrimagnetic and antiferromagnetic spins. Neutron diffraction studies reveal that for thin CoO layers the onset temperature for exchange biasing TB matches the onset of locked-in, preferential perpendicular coupling of the spins, rather than the antiferromagnetic ordering temperature TN. The results are explained by considering the role of anisotropic exchange first proposed by Dzyaloshinsky and Moriya and developing a model based purely on information on structural defects and exchange for these oxides. The devised mechanism provides a general explanation of biasing in systems with perpendicular coupling.
Repository Citation
Ijiri, Y., T. C. Schulthess, J. A. Borchers, P. J. van der Zaag, et al. 2007. "Link between perpendicular coupling and exchange biasing in Fe3O4/CoO multilayers." Physical Review Letters 99.
Publisher
American Physical Society
Publication Date
1-1-2007
Publication Title
Physical Review Letters
Department
Physics and Astronomy
Document Type
Article
DOI
https://dx.doi.org/10.1103/PhysRevLett.99.147201
Language
English
Format
text
