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Title: Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film.
Authors: van Lierop, J
Southern, BW
Lin, KW
Guo, ZY
Harland, CL
Rosenberg, RA
Freeland, JW
Keywords: Antiferromagnetic materials
Temperature range
Ferromagnetic materials
Thin films
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., & 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
ISSN: 1098-0121
Appears in Collections:Journal Articles

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