FeSi/Si成份调制膜的二维磁性和死层效应

TWO DIMENSIONAL MAGNETISM AND DEAD LAYER EFFECT IN COMPOSITIONALLY MODULATED FeSi/Si FILMS

成功地制成了FeSi/Si非晶态成分调制膜,固定Si层厚度,系统改变FeSi层厚度d_m发现,随d_m下降,饱和磁化强度M_s单调减小,这主要是死层效应的贡献,OK下死层厚度约为5.8A,随d_m减小,调制膜逐渐由三维磁性转变为二维磁性,表现为出现低磁滞和无磁滞效应,线性的M_s(T)-T关系和Curie温度T_c的单调下降,T_c满足如下关系:△T_c∝d_m^(-1)其中λ=1.6。

The compositionally modulated amorphous films FeSi/Si have been prepared successfully. Systematically varying the thickness dm of the FeSi layers with fixed thickness of Si layers, it is shown that the saturation magnetization M, decreases monotonously with decreasing dm. This basically is the contribution from the dead layer effect. The thickness of dead layer at OK is about 5.8A. With decreasing dm, the modulated films transit from three dimensional magnetism to two dimensional one gradually. The expressions of this transition are the appearances of low magnetic and nonmagnetic hysteresis effect, the linear Ms(T)-T relations and the monotonous decreasing of Curie temperature Tc. Tc satisfies the equation: A where λ=1.6.