Current-perpendicular-to-plane giant magnetoresistive properties in Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25) all-Heusler alloy pseudo spin valve
Current-perpendicular-to-plane giant magnetoresistive properties in Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25) all-Heusler alloy pseudo spin valve
复制标题
Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25)全霍斯勒合金赝自旋阀电流垂直平面巨磁阻特性
DOI：
10.1063/1.4942853
复制
发表时间：
2016
影响因子：
3.2
通讯作者：
K. Hono
中科院分区：
文献类型：
--
作者：
Songtian Li;Y. Takahashi;Y. Sakuraba;Jiamin Chen;T. Furubayashi;O. Mryasov;S. Faleev;K. Hono
基于第一性原理计算，提出了一种新型的非磁性Cu 2 TiAl（CTA）Heusler化合物作为全Heusler合金电流垂直面巨磁电阻器件的隔离层材料。在MgO（100）单晶衬底上生长的（001）取向Co2 Mn（Ge0.75Ga0.25）（CMGG）/CTA/CMGG赝自旋阀（PSV）具有较大的磁电阻输出，ΔRA = 5.4 mΩ μm2，与相同条件下制备的CMGG/Ag/CMGG PSV相当。考虑到CTA中自旋扩散长度较短，这一结果表明CTA/CMGG界面比Ag/CMGG界面具有更好的电子能带匹配，与第一性原理计算结果一致。（001）-和（011）-取向CMGG/CTA/CMGG PSV显示出相似的MR输出，表明CTA垫片抑制了MR输出的取向依赖性，这通常在Ag垫片CPP-PSV中观察到。
Nonmagnetic Cu2TiAl (CTA) Heusler compound is proposed as a new spacer material for all-Heusler alloy current-perpendicular-to-plane giant magnetoresistance devices based on first-principle calculations. The (001)-orientated Co2Mn(Ge0.75Ga0.25) (CMGG)/CTA/CMGG epitaxial pseudo spin valve (PSV) grown on MgO(100) single crystal substrate showed relatively large MR output, ΔRA∼5.4 mΩ μm2, which is comparable to that of the CMGG/Ag/CMGG PSV prepared with the same condition. Considering the short spin diffusion length in CTA, this result indicates a better electronic band matching for the CTA/CMGG interface than the Ag/CMGG interface in agreement with the first-principle calculation results. (001)- and (011)-orientated CMGG/CTA/CMGG PSV show similar MR outputs, indicating that the CTA spacer suppresses the orientation dependence of MR output which is usually observed in Ag-spacer CPP-PSV.