Role of interfacial uncompensated antiferromagnetic spins in unidirectional anisotropy in Ni81Fe19/CoO bilayers (invited)
1998; American Institute of Physics; Volume: 83; Issue: 11 Linguagem: Inglês
10.1063/1.367721
ISSN1520-8850
AutoresK. Takano, R. H. Kodama, A. E. Berkowitz, Wei Cao, G. Thomas,
Tópico(s)Theoretical and Computational Physics
ResumoThe uncompensated spins on the surfaces of antiferromagnetic CoO films exhibit a thermoremanent magnetization after field cooling from T>TN that has the same temperature dependence as the exchange field of Ni81Fe19/CoO bilayers after field cooling. This suggests that these interfacial uncompensated spins are responsible for unidirectional anisotropy. A model based on a calculation of the density of these interfacial uncompensated spins predicts the correct magnitude of the exchange field, as well as the observed inverse dependence on average interfacial grain size.
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