Giant magneto-optical Faraday effect of nanometer Fe-In2O3 granular films

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2008,（8）
• 页码范围: 1133-1137
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11434-008-0043-9

摘要

The giant magneto-optical Faraday effect of nanometer ferromagnetic metal-semiconductor matrix Fe-In2O3 granular films prepared by the radio frequency sputtering are studied. The result shows that the Faraday rotation angle θF value of the granular film samples with Fe volume fraction x=35% is of the order of 105(°)/cm at room temperature. Temperature dependence of the Faraday rotation angle θF of Fe0.35(In2O2)0.65 granular films shows that θF value below 10 K increases rapidly with the decrease of the temperature, and when T=4.2 K,θF value is 106(°)/cm. Through the study of the dependence of low field susceptibility on temperature and the hysteresis loops at different temperatures, it has been found that when the temperature decreases to a critical point TP=10K, the transformation of state from ferro-magnetic to spin-glass-like occurs in Fe0.35(In2O3)0.65 granular films. The remarkable increase of the Faraday rotation angle eF value of Fe0.35(In2O3)0.65 granular films below 10 K seems to arise from the sp-d exchange interaction of the granular film samples in the spin-glass-like state.