Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films

Article

关键词: FE3O4 FILMS;    THIN-FILMS;    MAGNETORESISTANCE;    NANOPARTICLES;    SUPERLATTICES;    MULTILAYERS;    ANISOTROPY;    BILAYERS;    SURFACE;    MOMENT;   

DOI  :  10.1103/PhysRevB.57.R8107

来源: SCIE

【 摘 要 】

We provide evidence that thin films of magnetite Fe3O4 epitaxially grown on single-crystalline MgO(100), form domains with unique magnetic properties. Strong 180 degrees Fe-O-Fe superexchange paths at antiphase domain boundaries result in a frustration of the interdomain interactions. Probe-layer Mossbauer spectroscopy shows superparamagnetic behavior in the entire film, in spite of the nearly perfect layer-by-layer growth. Superconducting quantum interference device magnetometry is used to determine the temperature and thickness dependence of the superparamagnetic blocking temperatures.

【 授权许可】

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