Please use this identifier to cite or link to this item:
|標題:||Exchange bias in a columnar nanocrystalline Ni80Fe20/CoO thin film||作者:||van Lierop, J.
|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.||摘要:||
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.
|Appears in Collections:||材料科學與工程學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.