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arXiv 2003.14306cond-mat.mtrl-sci
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含Pd和Pt插入层的Co/Ni基多层膜的磁性

Magnetic properties of Co/Ni-based multilayers with Pd and Pt insertion layers

Michael Heigl, Ralph Wendler, Simon Haugg, Manfred Albrecht

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摘要：

在这项研究中，Pd和Pt插入层的Co/Ni多层膜（ML）的磁性能，如磁各向异性，饱和磁化强度，矫顽力，磁畴尺寸和居里温度的影响，进行了研究。我们比较了三个系列的[Co/Ni/X]N ML系统（X = Pd，Pt，无插入层），改变单个Co层厚度以及重复次数N。对于不同的Co层厚度，所有三个系统的行为非常相似。对于所有系统，最大有效磁各向异性实现与Co层厚度在0.15 nm和0.25 nm之间的ML。从面外到面内系统的过渡发生在约0.4 nm的Co处。而[Co（0.2 nm）/Ni（0.4 nm）]N ML在6次双层重复后从面外到面内改变其优选的易磁化轴，Pd和Pt的插入导致这种过渡的延伸超过15次重复。最大有效磁各向异性增加了一倍以上，从[Co/Ni]3的105 kJ/m3增加到Pt和Pd的275和186 kJ/m3。此外，插入层大大降低了Co/Ni多层膜的初始饱和磁化强度（1100 kA/m），并将居里温度从720 K降低到500 K左右

英文摘要：

In this study, the influence of Pd and Pt insertion layers in Co/Ni multilayers (MLs) on their magnetic properties, e.g. magnetic anisotropies, saturation magnetization, coercivity, magnetic domain size, and Curie temperature, is investigated. We compare three series of [Co/Ni/X]N ML systems (X = Pd, Pt, no insertion layer), varying the individual Co layer thickness as well as the repetition number N. All three systems behave very similarly for the different Co layer thicknesses. For all systems, a maximum effective magnetic anisotropy was achieved for MLs with a Co layer thickness between 0.15 nm and 0.25 nm. The transition from an out-of-plane to an in-plane system occurs at about 0.4 nm of Co. While [Co(0.2 nm)/Ni(0.4 nm)]N MLs change their preferred easy magnetization axis from out-of-plane to in-plane after 6 bilayer repetitions, insertion of Pd and Pt results in an extension of this transition beyond 15 repetitions. The maximum effective magnetic anisotropy was more than doubled from 105 kJ/m3 for [Co/Ni]3 to 275 and 186 kJ/m3 for Pt and Pd, respectively. Furthermore, the insertion layers strongly reduce the initial saturation magnetization of 1100 kA/m of Co/Ni MLs and lower the Curie temperature from 720 to around 500 K

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