Abstract
Here, an Fe85.7Si1B10C1P2Cu0.3 diluted nanocrystalline alloy exhibiting relatively high Bs of 1.69 T and low Hc of 2.58 A/m is successfully developed. In addition, the effects of substituting C with P on the thermal behavior, magnetic properties, microstructure, and magnetic domains of Fe85.7Si1B10C3−xPxCu0.3 (x = 0, 1, 2, and 3 at%) amorphous alloys are investigated. It is found that the addition of P not only improves glass forming ability, but also enhances thermal stability of the amorphous alloy. Furthermore, the suitable P addition can also optimize the soft magnetic properties under heat treatment. For the Fe85.7Si1B10C1P2Cu0.3 alloy, the improved Bs is due to the formation of bcc-Fe crystals and the lowest Hc is caused by the low magneto-crystalline anisotropy, which are both induced by the construction diluted nanocrystalline structure. The formation of this unique microstructure is due to the competition between stabilization effect on amorphous phase of higher crystallization activation energy and the facilitation effect on the formation of bcc-Fe crystal by atomic-scale preexisting crystal-like clusters.
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