Abstract
The observation of superparamagnetism is reported in thin films of 0.5Fe 2O 30.1Bi 2O 30.4ZnO sputtered at high temperatures. The samples were deposited in a mixed oxygen-argon atmosphere at substrate temperatures T s = 325–525 K. Films are X-ray amorphous and paramagnetic for T s </ 475 K. For T s = 525 K, 50 nm microcrystals of an unidentified phase are detected by X-ray diffraction (XRD). Magnetic measurements were done on this film for static field as high as 30 kG and temperatures over the range 5–300 K. Curves of magnetization versus temperature for field-cooled and zero-field-cooled conditions separate at a specific temperature T f. Below T f, hysteresis and remanence are observed in the static field dependence of the magnetization. The superparamagnetic behavior is attributed to clusters with a mean diameter of 7 nm which are not identified by XRD.
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