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

DOI PDF 被引用文献2件
  • C. Prados
    Instituto de Magnetismo Aplicado, UCM-RENFE. Box 155, 28230 Las Rozas, Madrid, Spain
  • M. Multigner
    Instituto de Magnetismo Aplicado, UCM-RENFE. Box 155, 28230 Las Rozas, Madrid, Spain
  • A. Hernando
    Instituto de Magnetismo Aplicado, UCM-RENFE. Box 155, 28230 Las Rozas, Madrid, Spain
  • J. C. Sánchez
    Departamento de Quı́mica Inorgánica, ICMS, CICIC, Avda A, Vespuccio, Sevilla 41092, Spain
  • A. Fernández
    Departamento de Quı́mica Inorgánica, ICMS, CICIC, Avda A, Vespuccio, Sevilla 41092, Spain
  • C. F. Conde
    Departamento de Fı́sica de la Materia Condensada, US-ICMS, P.O. 1065, Sevilla 41080, Spain
  • A. Conde
    Departamento de Fı́sica de la Materia Condensada, US-ICMS, P.O. 1065, Sevilla 41080, Spain

書誌事項

公開日
1999-04-15
DOI
  • 10.1063/1.370280
公開者
AIP Publishing

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説明

<jats:p>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.</jats:p>

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