Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

Abstract

The high-purity FeCo particles with particle size ranging from 100 nm to 5 μm are fabricated using a direct chemical method. The controlled morphologies of the FeCo samples vary from nearly-spherical to urchin-like or cubic shape under optimal reaction conditions. Very slight surface oxidation is observed in these large-grain FeCo particles. It shows a low coercivity with 91 Oe for the nearly-spherical FeCo particles, while a much higher coercivity of 236 Oe is observed in the urchin-like samples, which can be mainly ascribed to their different morphologies and particle sizes. High saturation magnetization of 205-211 A/m 2 /kg can be achieved in these micron-level FeCo particles due to their high purity and single bodycentered cubic (bcc) phase structure. The compositioncontrolled FeCo particles with different Fe/Co atom ratios can be obtained by adjusting the reaction temperature, which results in their variable saturation magnetization. The relative simple and low-cost chemical synthesis of large-grain FeCo particles promise their potential use in complicated shape and miniaturized FeCo-based magnetic components.

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“…49-1568) can be obviously seen. 28 No oxidation peaks shown in the XRD patterns demonstrate good air stability of these FeCo powder products. However, for FeCo@SiO 2 , the Fe-Co alloy particles diffraction peaks have been strong in composites.…”

One-Step Room-Temperature Synthesis of Bimetallic Nanoscale Zero-Valent FeCo by Hydrazine Reduction: Effect of Metal Salts and Application in Contaminated Water Treatment

“… 29 , 30 Noteworthy, the N 2 generated during the reaction could protect the formed FeCo against oxidization. 33 …”

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“…In particular, 5N or higher purity cobalt is needed for contact layer applications in integrated circuits. [1][2][3][4][5][6][7] To produce 5N or higher purity cobalt in an electrorefining process, one of the challenges is to effectively reduce the Fe content of aqueous cobalt salt solution before electrolysis. Chemical precipitation and solvent extraction are methods often employed to remove iron from cobalt salt solutions.…”

“…In particular, 5N or higher purity cobalt is needed for contact layer applications in integrated circuits. 1–7…”