Structure and magnetoresistive properties of current-perpendicular-to-plane pseudo-spin valves using polycrystalline Co2Fe-based Heusler alloy films

Structure and magnetoresistive properties of current-perpendicular-to-plane pseudo-spin valves using polycrystalline Co2Fe-based Heusler alloy films
复制标题

使用多晶Co2Fe基Heusler合金薄膜的电流垂直于平面赝自旋阀的结构和磁阻性能

DOI:
10.1016/j.actamat.2013.03.001
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发表时间:
2013
期刊:
影响因子:
9.4
通讯作者:
K. Hono
K. Hono
中科院分区:
材料科学1区
文献类型:
--
作者:
T.M. Nakatani;Ye Du;Y.K. Takahashia;T. Furubayashi;K. Hono

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本文报道了多晶Co_2Fe(Al_(0.5)Si_(0.5))(CFAS)和Co_2Fe(Ga_(0.5)Ge_(0.5))(CFGG)Heusler合金薄膜赝自旋阀(PSV)的电流垂直面巨磁电阻(CPP-GMR)。在Ta/Ru/Ag底层上生长了强[011]织构的多晶Heusler合金薄膜。采用厚度为5 nm的Heusler合金膜和Ag间隔层,经450°C退火的CFAS PSV和350°C退火的CFGG PSV,获得了较大的CPP-GMR值,ΔRA可达4 m Ωμ m2,ΔR/R可达10%.透射电子显微镜揭示了[011]织构CFAS层和[111]织构Ag间隔层之间的平坦且尖锐的界面。退火以上的最佳温度为每个PSV导致MR值的减少,作为一个结果的增厚的间隔层引起的Ag扩散从外部Ag层。
We report current-perpendicular-to-plane giant magnetoresistance (CPP–GMR) of pseudo-spin valves (PSVs) with polycrystalline Co2Fe(Al0.5Si0.5) (CFAS) and Co2Fe(Ga0.5Ge0.5) (CFGG) Heusler alloy films. Strongly [011] textured polycrystalline Heusler alloy films grew on the Ta/Ru/Ag underlayer. Relatively large CPP–GMR values of ΔRA up to 4mΩμm2and ΔR/R up to 10% were obtained with 5nm thick Heusler alloy films and Ag spacer layer by annealing CFAS PSV at 450°C and CFGG PSV at 350°C. Transmission electron microscopy revealed a flat and sharp interface between the [011] textured CFAS layers and the [111] textured Ag spacer layer. Annealing above an optimal temperature for each PSV led to reductions in MR values as a result of the thickening of the spacer layer induced by the Ag diffusion from the outer Ag layers.
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