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IrMn基反铁磁自旋阀的巨磁电阻效应
Giant magnetoresistance in IrMn based antiferromagnetic spin valve
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摘要: 用第一性原理方法研究了在微观尺度具有三重对称磁结构的IrMn合金的反铁磁自旋阀（AFSV）的电子输运.研究表明：基于有序L12相IrMn合金的Co/Cu/IrMn自旋阀的巨磁电阻（GMR）效应具有三重对称性,可以利用这一特性区分反铁磁材料的GMR与传统铁磁材料的GMR.基于无序γ相IrMn合金的IrMn（0.84nm）/Cu（0.42nm）/IrMn（0.42nm）/Cu（0.42nm）（111）AFSV的电流平行平面构型的GMR约为7.7%,大约是电流垂直平面构型的GMR（3.4%）的两倍,明显大于实验中观测到的基于共线磁结构的FeMn基AFSV的GMR.Abstract: According to the parameter-free first principles calculations,we investigate the spin polarized transport in antiferromagnetic spin valve （AFSV） based on noncollinear IrMn.The giant magnetoresistance （GMR） in Co/IrMn/Cu（111） with L12-type IrMn shows three-fold rotational symmetry,which is easy to be distinguished from the GMR of normal ferromagnetic spin valves.Moreover,GMR based on γ-phase IrMn with current-in-plane （CIP） structure shows that GMR is 7.7%,around two time larger than that in current-pendicular-to-plane （CPP） structure （3.4%）.Our study demonstrates that the AFSV CIP structure possesses a larger GMR effect than the CPP structure,and the GMR effect in AFSV based on noncollinear antiferromagnetic structure is larger than that based on collinear antiferromagnetic structure such as FeMn.
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