Temperature dependence of current-perpendicular-to-plane giant magnetoresistance in the junctions with interface tailored Heusler alloy electrodes

Temperature dependence of current-perpendicular-to-plane giant magnetoresistance in the junctions with interface tailored Heusler alloy electrodes
复制标题

界面定制赫斯勒合金电极结中电流垂直于平面巨磁阻的温度依赖性

DOI:
10.1016/j.jmmm.2018.11.051
复制
发表时间:
2019
影响因子:
2.7
通讯作者:
Koki Takanashi
Koki Takanashi
中科院分区:
材料科学3区
文献类型:
--
作者:
Takahide Kubota;Yusuke Ina;Zhenchao Wen;Koki Takanashi

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电流垂直面结、CPP结、巨磁电阻结、GMR结等在传感器件中的应用引起了人们的兴趣,如硬盘驱动器的读头元件。CPP-GMR效应的温度依赖性进行了研究,在这项研究中,由半金属Heusler合金,Co2(Fe-Mn)Si,电极和L12型Ag 3 Mg间隔超薄界面层,铁或镁的结。对于Fe插入结,MR比在50 K至250 K的温度范围内表现出局部最大值,这取决于插入厚度。Fe结的反常温度依赖性的原因尚不清楚,然而,一种可能性是Fe插入物在超薄区域的居里温度降低。另一方面,对于Mg插入结,MR比随着温度的降低而单调增加,在10 K时观察到约100%的MR比。在300 K的低温MR的比率几乎是独立的插入厚度。考虑到MR曲线的形状几乎不受温度变化的事实,这表明Mg插入物在Co2(Fe-Mn)Si/Ag 3 Mg界面处起扩散阻挡作用。
Current-perpendicular-to-plane, CPP, giant magnetoresistance, GMR junctions attract interests for application of sensor devices, such as read head element of hard disk drives. Temperature dependence of the CPP-GMR effects was investigated, in this study, for junctions consisting of the half-metallic Heusler alloy, Co2(Fe-Mn)Si, electrodes and an L12-type Ag3Mg spacer with the ultra-thin interface layers, Fe or Mg. For the Fe insert junctions, MR ratio exhibited local maximum at a temperature ranging from 50 K to 250 K which depends on the insertion thickness. The reason is unclear for the anomalous temperature dependence of the Fe junctions, however, a possibility is reduction of the Curie temperature for the Fe insert at the ultra-thin regime. On the other hand, MR ratios monotonically increased with decreasing the temperature for the Mg insert junctions, for which MR ratio of about 100% was observed at 10 K. Ratios of MR at 300 K to the low temperature are almost independent of the insertion thickness. Considering a fact that the shapes of MR curves nearly unchanged by the temperature change, it is suggested that the Mg insert works as a diffusion barrier at the Co2(Fe-Mn)Si/Ag3Mg interfaces.
通过在 Co2Mn (Ga0.5Sn0.5)/Ag 界面插入 Co50Fe50 层增强电流垂直于平面的巨磁阻
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