Abstract
It is difficult to fabricate high-purity amorphous FeCo alloys by traditional physical methods due to their weak glass forming ability. In this work, the fully amorphous FeCo nanoalloys with high purity and good stability have been prepared by a direct chemical reduction of Fe2+ and Co2+ ions with NaBH4 as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant. The morphologies, surface compositions and particle sizes with their distribution of these amorphous samples can be effectively tuned by the suitable PVP additions. High crystallization temperature up to 468 °C, high saturation magnetization of 196.2 A·m2·kg−1 and low coercivity of 83.3 Oe are obtained in amorphous FeCo nanoalloys due to their uniform distribution, weak surface oxidation and low surface B concentration. Good frequency-dependent magnetic properties can be also achieved in the fully compacted amorphous sample with a high density of 7.20 g/cm3. The simple chemical method, high stability and good magnetic properties for these amorphous FeCo nanoalloys promise their significant potential applications in high-power magnetic devices.
Highlights
The nanosized FeCo or FeCo-based alloys have attracted much attention on their fabrication and characterization due to their good chemical properties and tunable magnetic properties varying with their compositions, which show a significant potential application in many technological areas such as numerous advanced magnetic devices, catalytic and medical applications [1,2,3,4]
Compared with FeCo-based crystalline alloys, the amorphous counterparts have attracted more research interests for their combined good mechanical, electrical and magnetic properties including good deformability, high fracture strength, high resistivity and low coercivity, which make them a crucial soft magnetic material for high-power and high-frequency applications [5,6,7,8]. These amorphous alloys based on FeCo can be fabricated by some traditional physical methods such as copper mold casting, rapid quench and single-roller melt spinning [9,10,11]
It has been reported that Fe- or Co-based amorphous alloys can be fabricated through arc melting by the addition of some rare earth elements such as Tb and Nd [17,18]
Summary
The nanosized FeCo or FeCo-based alloys have attracted much attention on their fabrication and characterization due to their good chemical properties and tunable magnetic properties varying with their compositions, which show a significant potential application in many technological areas such as numerous advanced magnetic devices, catalytic and medical applications [1,2,3,4]. Compared with FeCo-based crystalline alloys, the amorphous counterparts have attracted more research interests for their combined good mechanical, electrical and magnetic properties including good deformability, high fracture strength, high resistivity and low coercivity, which make them a crucial soft magnetic material for high-power and high-frequency applications [5,6,7,8]. These amorphous alloys based on FeCo can be fabricated by some traditional physical methods such as copper mold casting, rapid quench and single-roller melt spinning [9,10,11]. The microstructures along with their thermal stability, surface element states and magnetic properties of these amorphous FeCo nanoalloys have been systematically studied
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