A novel strategy for approaching high performance SmCo5/Co nanocomposites

摘要

Anisotropic SmCo5/Co magnetic nanocomposites have been fabricated by chemical deposition of Co nanowires based on SmCo5 nanoflakes. The SmCo5 nanoflakes with an average thickness of 200 nm and diameter of 4 mm were first prepared by surfactant-assisted high-energy ball-milling. The Co nanowires with mean diameter of 20 nm and length of 200 nm were then deposited via a solvothermal chemical process. This strategy can effectively control the content of SmCo5 nanoflakes and Co nanowires, and the hard magnetic nanoflakes can be coated with a uniform distribution of Co nanowires. Both of the SmCo5 nanoflakes and Co nanowires are anisotropic, and could be magnetically aligned simultaneously in the nanocomposites, which is confirmed by XRD patterns. Magnetic measurements of the "bi-anisotropic" SmCo5/Co composites show an enhanced remanent magnetization with increasing the content of Co nanowires. The exchange-coupled SmCo5/Co nanocomposites with up to 40 wt % Co content exhibits the highest (BH)(max) value of 23.8 MGOe, larger than the single phase SmCo5 nanoflakes. (C) 2019 Elsevier B.V. All rights reserved.