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ANSTO Publications Online >
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Journal Articles >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/993
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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 Anisotropy Spin Nanostructures Temperature Range Asymmetry 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., 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 |
| URI: | http://dx.doi.org/10.1103/PhysRevB.76.224432 http://apo.ansto.gov.au/dspace/handle/10238/993 |
| ISSN: | 1098-0121 |
| Appears in Collections: | Journal Articles |
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