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|Title: ||Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film.|
|Authors: ||van Lierop, J|
|Keywords: ||Antiferromagnetic Materials|
|Issue Date: ||28-Dec-2007|
|Publisher: ||The American Physical Society|
|Citation: ||van Lierop, J., Southern, B. W., Lin, K. W., Guo, Z. Y., Harland, C. L., Rosenberg, R. A., et al. (2007). Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film. Physical Review B, 76(22), 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|
|Appears in Collections:||Journal Articles|
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