中文摘要：

通过研究外应力场下铁磁多层膜系统中的自旋结构,讨论了系统磁电阻对外应力的依赖关系.结果表明,外应力能够诱发磁电阻效应,且其磁电阻紧密依赖于外应力的大小和方向.一般地对铁磁性层间耦合,其磁电阻与外应力之间的关系紧密地依赖于两铁磁层的磁致伸缩系数以及磁晶各向异性之差异.具体地,大小一定的外应力由磁易轴向磁难轴旋转的过程中,磁电阻先缓慢增大后急剧减小,在磁难轴附近变化较敏锐,并出现峰值.外应力方向一定时,磁电阻随应力的增大先敏锐增强后缓慢减小,且应力方向偏离磁易轴越远,变化趋势越显著.特别地,当外应力完全垂直于磁易轴时,应力大小的变化会引起磁电阻翻倍.而外应力场介于8πM/5≤Hλ≤18πM/5时,磁电阻会随应力的旋转单调上升,并在磁难轴附近急剧增强,产生GMR效应;对反铁磁性层间耦合,其GMR效应对应力大小和方向的响应近似地相反于铁磁性层间耦合情形.

英文摘要：

By investigating the spin configuration in ferromagnetic multilayer under stress field,the dependence of magnetoresistance （MR） upon the stress field in the ferromagnetic multilayer is discussed. The stress field can induce MR,and the MR strongly depends on both the value and the direction of the stress field. Generally,for the case of J〉0,the stress field dependence of MR is closely related with the differences in magnetostriction and magnetocrystalline anisotropy between two ferromagnetic layers. When the stress field deviates from the magnetic easy axis lowards the magnetic hard axis,the MR first increases slowly,and then decreases rapidly. For a given direction of stress field,the MR first increases rapidly,later decreases slowly with stress field increasing. Moreover,when the direction of stress field approaches that of the hard axis,the dependence of MR upon both the value and the direction of the stress field becomes obvious. Especially,if the direction of the stress field is perpendicular to the easy axis,change of MR can double its value with the stress field increasing. When the stress field Hλ meets the condition 8πM/5≤Hλ≤18πM/5,MR increases monotonically,and the giant magnetoresistance （GMR） occurs. In the case of J〈0,the stress field dependence of GMR is almost similar to that in the case of J〉0.