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|Title:||Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film.|
|Authors:||van Lierop, J|
|Publisher:||The American Physical Society|
|Citation:||van Lierop, J., Southern, B. W., Lin, K. W., Guo, Z. Y., Harland, C. L., Rosenberg, R. A., & Freeland, J. W. (2007). Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film. Physical Review B, 76(22), 224432. doi:10.1103/PhysRevB.76.224432|
|Abstract:||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. © 2007, American Physical Society|
|Gov't Doc #:||1109|
|Appears in Collections:||Journal Articles|
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