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標題: Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film
作者: van Lierop, J.
Southern, B.W.
Lin, K.W.
Guo, Z.Y.
Harland, C.L.
Rosenberg, R.A.
Freeland, J.W.
關鍵字: uncompensated antiferromagnetic spins;unidirectional anisotropy;ni81fe19/coo bilayers;nanostructures;temperature;coercivity;dependence;asymmetry;model;iron
Project: Physical Review B
期刊/報告no:: Physical Review B, Volume 76, Issue 22.
The effects of interfacial coupling at the boundary of ferromagnetic and antiferromagnetic components in a nanoscale columnar-structured thin film of Ni80Fe20/CoO have been examined. Field-cooling the film results in very different temperature dependences of the enhanced coercivity and exchange-bias shift of the hysteresis loop. The exchange-bias temperature dependence is well described by thermal fluctuations of the interfacial spins while the coercivity temperature dependence indicates that single-domain-like columns are being coherently rotated by the thermal fluctuations of the interface spins. Furthermore, only a portion of the spins in the antiferromagnetic layer seem to be associated with the spin coupling that results in exchange bias. X-ray magnetic resonant scattering measurements show clearly the presence of canted Co interfacial moments that provide a local field which enables exchange bias at a significantly higher temperature than the onset of an enhanced coercivity.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.76.224432
Appears in Collections:材料科學與工程學系

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