利用极化中子反射率（PNR）研究了两种垂直磁各向异性（PMA）Co/Pd多层膜对H2和D2的吸收效应。PNR是在外加磁场H作用于样品平面内，磁化强度M限制在平面内（μ o H= 6.0 T），部分在平面外（μ o H = 0.65 T）时测量的。Co和Pd层的标称厚度分别为2.5 μ m和21 μ m。由于这些小的值，实际层的化学成分，厚度和界面粗糙度参数确定从核散射长度密度分布（ρ_n）和它的衍生物从X射线反射率和PNR，并确定不确定性使用Monte Carlo分析。PNR ρ_n表明，虽然D2吸收发生在整个样品中，但多层堆叠中的吸收是适度的（0.02 D/Pd原子），因此没有扩展。直接磁分析表明，H2吸收减少了饱和时的总M，并增加了未饱和时样品平面中M的分量。PNR磁散射长度密度（ρ_m）表明，多层膜中的Pd层是磁化的，并且它们的磁化强度在D2吸收时优先改变。在一个样品中，在μ_o H= 0.65 T处观察到具有两倍多层周期的M调制，其在D2吸收时增加。这些结果表明，H2或D2吸收降低了样品的PMA和总磁化强度。在吸收过程中缺乏可测量的膨胀表明这些变化主要由材料的电子结构的改变所控制。
英文摘要：
The effects of hydrogen (H2) and deuterium (D2) absorption were studied in two Co/Pd multilayers with perpendicular magnetic anisotropy (PMA) using polarized neutron reflectivity (PNR). PNR was measured in an external magnetic field H applied in the plane of the sample with the magnetization M confined in the plane for μ_o H= 6.0 T and partially out of plane at 0.65 T. Nominal thicknesses of the Co and Pd layers were 2.5 Å and 21 Å, respectively. Because of these small values, the actual layer chemical composition, thickness, and interface roughness parameters were determined from the nuclear scattering length density profile (ρ_n) and its derivative obtained from both x-ray reflectivity and PNR, and uncertainties were determined using Monte Carlo analysis. The PNR ρ_n showed that although D2 absorption occurred throughout the samples, absorption in the multilayer stack was modest (0.02 D per Pd atom) and thus did not expand. Direct magnetometry showed that H2 absorption decreased the total M at saturation and increased the component of M in the plane of the sample when not at saturation. The PNR magnetic scattering length density (ρ_m) revealed that the Pd layers in the multilayer stack were magnetized and that their magnetization was preferentially modified upon D2 absorption. In one sample, a modulation of M with twice the multilayer period was observed at μ_o H= 0.65 T, which increased upon D2 absorption. These results indicate that H2 or D2 absorption decreases both the PMA and total magnetization of the samples. The lack of measurable expansion during absorption indicates that these changes are primarily governed by modification of the electronic structure of the material.
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Institute of Industrial Science, The University of Tokyo（东京大学工业科学研究所）；School of Materials and Chemical Technology, Institute of Science Tokyo（东京科学大学材料化学技术学院）；Department of Chemistry, The University of Tokyo（东京大学化学系）；Advanced Science Research Center, Japan Atomic Energy Agency（日本原子力研究开发机构先进科学研究中心）
High-pressure phase diagram of hydrogen and deuterium sulfides from first principles: structural and vibrational properties including quantum and anharmonic effects
Hydrogen-Induced Sign Reversal in Magnetic Hysteresis Evolution of CoPd Alloys and Co/Pd Multilayers
Institute of Industrial Science, The University of Tokyo（东京大学工业科学研究所）；Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel Aviv University（特拉维夫大学雷蒙德和贝弗利萨克勒理学院物理与天文学系）
