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研究了射频溅射法制备的纳米“铁磁金属-半导体基体”Fe-In2O3颗粒膜的巨磁光Faraday效应.实验结果表明,当Fe体积百分比为35%时,颗粒膜样品的室温Faraday旋转角θF数值达到105(°)/cm数量级.Fe0.35(In2O3)0.65颗粒膜样品的Faraday旋转角θF随温度的变化关系表明,当温度低于10K时,θF数值随温度的下降而迅速增大,在温度T=4.2K时Faraday旋转角θF达到106(°)/cm.通过研究颗粒膜低场磁化率χ(T)与温度的关系以及不同温度下的磁滞回线,证明当温度降低到临界温度TP=10K时,颗粒膜中发生“铁磁态-类自旋玻璃态”转变.Fe0.35(In2O3)0.65颗粒膜样品的Faraday旋转角θF在温度低于10K时的迅速增大,可能是由于纳米“铁磁金属-半导体基体”Fe0.35(In2O3)0.65颗粒膜样品在处于“类自旋玻璃态”时存在sp-d交换作用造成的.
The giant magneto-optic Faraday effect of nanoscale “ferromagnetic metal-semiconductor matrix” Fe-In2O3 particles prepared by radio frequency sputtering was studied.The experimental results show that when the volume percentage of Fe is 35% The rotation angle θF reaches the order of magnitude of 105 (°) / cm. The Faraday rotation angle θF of Fe0.35 (In2O3) 0.65 granular film samples shows that when the temperature is lower than 10K, the θF value rapidly decreases with the decrease of temperature And the Faraday rotation angle θF reaches 106 (°) / cm at T = 4.2 K. By investigating the relationship between the magnetic susceptibility χ (T) and the hysteresis loop at different temperatures, When the temperature decreases to the critical temperature TP = 10K, the “ferromagnetic state-like spin-glass state” transition occurs in the granular film.Faraday rotation angle θF of Fe0.35 (In2O3) 0.65 granular film samples at the temperature below 10K This may be attributed to the sp-d exchange in the “spin-glass-like” state of the nanometer ferromagnetic metal-semiconductor matrix "Fe0.35 (In2O3) 0.65.