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标题：Magnetotransport and magnetic properties of amorphous $$\mathrm{NdNi}_5$$ NdNi 5 thin films
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作者：Carla Cirillo ; Carlo Barone ; Harry Bradshaw 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
DOI：10.1038/s41598-020-70646-2
出版社：Springer Nature
摘要：$$\mathrm{NdNi}_5$$ is an intermetallic compound with a bulk Curie temperature ( $$T_{\mathrm{Curie}}$$ ) of 6–13 K. While existing studies have focused on $$\mathrm{NdNi}_5$$ crystals, amorphous thin-films of $$\mathrm{NdNi}_5$$ are potentially important since they would be magnetically soft without magnetocrystalline anisotropy, meaning that small external magnetic fields could reverse the direction of their magnetization. Here, we report $$\mathrm{NdNi}_5$$ thin-films with a thickness in the 5–200 nm range, deposited by DC magnetron sputtering onto Si(100). Films are amorphous with a weak temperature-dependent resistivity with values ranging between 150 and 300 $$\upmu \Omega$$ cm. By means of noise spectroscopy, by analyzing the time-dependence of fluctuation-induced voltages, it is found that at low temperatures the resistance fluctuations are due to the Kondo effect. Volume magnetometry indicates $$T_{\mathrm{Curie}} = 70$$ K with a magnetic coercive field of 30 mT at 5 K for a 125-nm-thick film. The results are promising for the development of Ferromagnet(F)/Superconductor(S)/Ferromagnet(F) pseudo spin-valve devices based on amorphous $$\mathrm{NdNi}_5$$ thin films.