CAJ | 학술논문

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.
제출일충유상적양자모형연구납미자과립막재외자장하적자학성질.용파은근사방법계산료량류불동자상적과립막적자전조.결과표명 ,자과립적평균산사절면수착원자수적증가이감소;거자전조래원우전도전자여자과립지간적여자선유관적산사.자전조수외자장화자구적변화여이보도과적실험부합.
The quantum phenomenological model has been proposed to investigate the magnetic property of nanometer magnetic granular film in an applied magnetic field.The magnetoresi stance of the granular films with two distinct magnetic phases has been calculat ed by using Born approximation.The results show that the average scattering cro ss-section of the magnetic cluster decreases with the increasing numb er 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 magnetoresi stance on the rate of magnetic moment are in good agreement with the experiments reported.