Tailoring the thermal stability and soft magnetic properties of Fe80-xNixSi7B8P4Cu1 amorphous nanocrystalline alloys based on the magnetic domain structure

Abstract

Structure, crystallization behavior, dynamic domains, and magnetic properties of as-quenched and annealed Fe80-xNixSi7B8P4Cu1 (x = 0, 1, 2, 3 and 4) alloy ribbons have been investigated. It finds that the partial substitution of Ni for Fe promotes the formation of amorphous structure. We have determined the critical spinning speed for the formation of pre-existing α-Fe cluster structures. In addition, a little increase in Ni content effectively inhibits the excessive growth of the α-Fe grains, which contributes to the reduction of grain size and Hc. Moreover, the role of Ni on the magnetic domain structures and its correlation medel was established. After proper annealing treatment, the Fe79Ni1Si7B8P4Cu1 nanocrystalline alloy exhibited excellent soft-magnetic properties including a high Bs of 1.58 T, a low Hc of 2.48 A/m and a high μe of 16400, which is closely related to the high volume fraction of α-Fe grains and uniform refinement of magnetic domains which is more conducive to the migration and rotation of magnetic domains.