【摘要】 提出一种唯象的量子模型研究纳米磁颗粒膜在外磁场下的磁学性质 .用玻恩近似方法计算了两类不同磁相的颗粒膜的磁电阻 .结果表明 ,磁颗粒的平均散射截面随着原子数的增加而减少 ;巨磁电阻来源于传导电子与磁颗粒之间的与自旋有关的散射 .磁电阻随外磁场和磁矩的变化与已报道过的实验符合更多还原

【Abstract】 The quantum phenomenological model has been proposed to investigate the magnetic property of nanometer magnetic granular film in an applied magnetic field.The magnetoresistance of the granular films with two distinct magnetic phases has been calculated by using Born approximation.The results show that the average scattering cross section of the magnetic cluster decreases with the increasing number n of the atom.The origin of the giant magnetoresistance comes from the spin dependent scattering between conduction electrons and magnetic granules and the field dependence of magnetoresistance and the quadratic relation of magnetoresistance on the rate of magnetic moment are in good agreement with the experiments reported.更多还原