Composition-controlled synthesis of solid-solution Fe–Ni nanoalloys and their application in screen-printed magnetic films
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Screen printing is attracting attention as a method for manufacturing magnetic components such as on-chip transformers and inductors. Fe–Ni alloys, which have high saturation magnetizations and permeabilities, are suitable as magnetic materials for screen-printed high-frequency devices. Here, we demonstrate the fabrication of a screen-printed film comprising solid-solution Fe–Ni nanoalloys, which can achieve enhanced permeability and reduced eddy-current losses in high-frequency regions. The Fe–Ni nanoalloys were prepared by chemical reduction using sodium borohydride as a reducing reagent followed by hydrogen reduction. X-ray diffraction measurements, electron microscopy, and inductively coupled plasma spectroscopy revealed that well-mixed FexNi100−x nanoalloys (x = 40, 21.5, and 10) with grain sizes of ~ 10 nm were synthesized. The obtained nanoalloys showed high saturation magnetizations comparable to bulk alloys. The screen-printed film using the Fe21.5Ni78.5 nanoalloy exhibited the highest permeability of the nanoalloy films. The eddy-current loss was suppressed by the synthesis of nanoscale-grained nanoalloys. The permeability was sufficiently high for application in transformers and inductors.
KeywordsFe–Ni Soft magnetic nanoalloys Magnetic properties Permeability Screen printing
We are grateful to Kazuya Okubo (Kyushu University, Japan) for his assistance with the synthesis and characterization.
Kenichi Yatsugi performed the experiments and wrote the paper. Toshitaka Ishizaki proposed the idea for this research. Kunio Akedo and Miho Yamauchi collaborated to design the research strategy.
Compliance with ethical standards
Conflicts of interest
The authors declare that they have no conflict of interest.
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