摘要
报道了Ｃａ掺杂量对Ｌａ－Ｃａ－Ｍｎ－Ｏ巨磁薄膜材料的巨磁效应影响，测量薄膜电阻（外磁场强度Ｈ＝０．５Ｔ）、磁化强度－温度关系曲线。认为Ｌａ１－ｘＣａｘＭｎＯ３体系中Ｍｎ４＋的含量是由于掺杂量Ｃａ的调制，Ｍｎ４＋的含量变化导致磁性结构转变。用双交换模型解释了该象现，对实验结果给出满意的解释。
It was reported that x amount on La1-xCaxMnO3 thin film affect giant magnetoresistance effect, the electrical resistivity ( H = 0.5T ) and magnetization of La1 - x CaxMn3 thin film were measured in the 10-300K range. The authors suggested that the change of x results in the change of proportion of Mn4+ ions. Variation of the proportion Mn4+ ions leads to the charge of magnetic structure of La1-xCaxMnO3. Zener, s model of double-exchange coupling can be used to explain the experimental results .
