Ultrafine FeCo Nanoparticles Isolated by Ultrathin Dielectric Shells for Microwave Application

Ultrafine FeCo Nanoparticles Isolated by Ultrathin Dielectric Shells for Microwave Application
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通过超薄介电壳分离的超细 FeCo 纳米粒子用于微波应用

DOI:
10.1021/acsanm.9b00537
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发表时间:
2019-06
影响因子:
5.9
通讯作者:
Yan Mi
Yan Mi
中科院分区:
材料科学2区
文献类型:
--
作者:
Bai Guohua;Jin Jiaying;Wu Chen;Yan Mi

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低维软磁材料对于磁性器件的小型化具有重要的技术意义。然而,在纳米磁性材料中保持铁磁响应是具有挑战性的。在这项工作中,超细FeCo纳米粒子已被制备的反应脉冲激光沉积,它可以通过交换耦合介电壳层,即使它们的直径远低于超顺磁性阻塞极限。这种独特的核/壳结构同时保证了相邻磁性纳米颗粒的铁磁耦合和绝缘。该纳米粒子薄膜的饱和磁化强度为1.13 T,电阻率为4200 μΩ·cm,最大磁导率为120,截止频率为1.7 GHz,是一种很有前途的微波应用材料。
Low-dimensional soft magnetic materials are technologically important for miniaturization of magnetic devices. It is, however, challenging to maintain ferromagnetic response in nanosized magnetic material. In this work, ultrafine FeCo nanoparticles have been prepared by reactive pulsed laser deposition, which can be exchange coupled through ultrathin dielectric shells, even though their diameters are far below the superparamagnetic blocking limit. This unique core/shell structure guarantees ferromagnetic coupling and insulation of neighboring magnetic nanoparticles simultaneously. The nanoparticle film exhibits large saturation magnetization of 1.13 T, high electrical resistivity of 4200 μΩ·cm, maximum permeability of 120, a cutoff frequency of 1.7 GHz, and it is a promising material for microwave application.
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