Structure and transport properties of current-perpendicular-to-plane spin valves using Co2FeAl0.5Si0.5 and Co2MnSi Heusler alloy electrodes
Structure and transport properties of current-perpendicular-to-plane spin valves using Co2FeAl0.5Si0.5 and Co2MnSi Heusler alloy electrodes
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DOI：
10.1063/1.3431530
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发表时间：
2010-06
影响因子：
3.2
通讯作者：
T. Furubayashi;K. Kodama;T. Nakatani;H. Sukegawa;Y. Takahashi;K. Inomata;K. Hono
中科院分区：
文献类型：
--
作者：
T. Furubayashi;K. Kodama;T. Nakatani;H. Sukegawa;Y. Takahashi;K. Inomata;K. Hono
本文报道了以Co2FeAl0.5Si0.5（CFAS）或Co2 MnSi（CMS）Heusler合金磁性层和Ag或Cu间隔层为磁性层的电流垂直面自旋阀（CPP SV）的结构和输运性质。采用磁控溅射法在MgO（001）单晶衬底上制备了sub/Cr/Ag/Heusler/（Ag或Cu）/ Heusler/Co 75 Fe 25/Ir 22 Mn 78/Ru多层膜。透射电子显微镜观察显示从衬底到顶部Heusler层的外延生长。CPP SV与CFAS/Ag/CFAS三层显示出相对较大的磁电阻（MR）的比率为12%，在室温和31%，在12 K，单调的温度依赖性。然而，具有CMS/Ag/CMS三层膜的SV的MR值显示出不同的温度依赖性，在100 K处的最大值为22%。这可能与两个CMS层之间的90°耦合有关。
We report the structure and transport properties of current-perpendicular-to-plane spin valves (CPP SVs) with Co2FeAl0.5Si0.5 (CFAS) or Co2MnSi (CMS) Heusler alloy magnetic layers and an Ag or Cu spacer layer. A multilayer stack of sub/Cr/Ag/Heusler/(Ag or Cu)/ Heusler/Co75Fe25/Ir22Mn78/Ru was deposited on a MgO(001) single crystalline substrate by magnetron sputtering. Transmission electron microscopy observations showed epitaxial growth from the substrate to the top Heusler layer. The CPP SV with a CFAS/Ag/CFAS trilayer showed relatively large magnetoresistance (MR) ratios of 12% at room temperature and 31% at 12 K, with monotonous temperature dependence. However, the MR values of the SV with the CMS/Ag/CMS trilayer showed a different temperature dependence with a maximum value of 22% at 100 K. This might be related to the 90° couplings between the two CMS layers.