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Dependence of exchange anisotropy and coercivity on the Fe-oxide structure in oxygen-passivated Fe nanoparticles

Opened Access Dependence of exchange anisotropy and coercivity on the Fe-oxide structure in oxygen-passivated Fe nanoparticles

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Autor: Conde Amiano, Alejandro
Conde Amiano, Clara Francisca
Prados, C.
Multigner, M.
Hernando, A.
Sánchez, J. C.
Fernández, A.
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 1999
Publicado en: Journal of Applied Physics, 85, 6118-6120
Tipo de documento: Artículo
Resumen: Ultrafine Fe particles have been prepared by the inert gas condensation method and subsequently oxygen passivated. The as-obtained particles consist in an Fe core surrounded by an amorphous Fe-oxide surface layer. The antiferromagnetic character of the Fe-oxide surface induces an exchange anisotropy in the ferromagnetic Fe core when the system is field cooled. Samples have been heat treated in vacuum at different temperatures. Structural changes of the Fe–O layer have been monitored by x-ray diffraction and transmission electron microscopy. Magnetic properties as coercivity, hysteresis loop shift, and evolution of magnetization with temperature have been analyzed for different oxide crystallization stages. A decrease of the exchange anisotropy strength is reported as the structural disorder of the surface oxide layer is decreased with thermal treatment.
Tamaño: 509.2Kb
Formato: PDF

URI: http://hdl.handle.net/11441/33472

DOI: http://dx.doi.org/10.1063/1.370280

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