The influence of P on glass forming ability and clusters in melt of FeSiBP amorphous soft-magnetic alloy

Abstract

Our experiment focused on investigating the P content dependences of the ability to form glass, the softmagnetic properties of, and the clusters in melting Fe 85-x Si 4 B 11 P x (x = 1-6), amorphous soft-magnetic alloys. The experimental results demonstrate that the alloys with proper P content (3-6 at.%) are prone to form a completely amorphous structure with a larger glass-forming ability (GFA); hence, amorphous alloys prepared by industry-grade raw materials can be well produced in an air atmosphere. The melted alloy has higher stability and larger GFA when there is no dominant cluster or when multi-species clusters coexist. The Fe 82 Si 4 B 11 P 3 amorphous alloy exhibited a high saturation magnetic flux density of up to 1.66 T, a low coercivity of about 2.2 A/m, and a high effective permeability of more than 1.2 9 10 4 at 1 kHz under a field of 1 A/ m. The combination of excellent soft-magnetic properties, good productivity and low cost stability suggest that the FeSiBP alloys are promising soft-magnetic materials, particularly with applications in the electronic industry.

Structural, magnetic, and electronic properties of Fe82Si4B10P4 metallic glass

“…Total magnetic moment of Fe 82 Si 4 B 10 P 4 becomes stable at 130 μ B at 300 K. According to the relationship between B S and magnetic moment ( M ) involving supercell volume ( V S ) B S  =  μ 0 ( M / V S ), where μ 0 is vacuum permeability (4π × 10 −7 TmA −1 ), the calculated value of V S is 918.6 Å 3 and then that of B S is 1.65 T, which is slightly below experimental result of Fe 82 Si 4 B 11 P 3 (1.66 T) 32 . This relates to their different contents of B and P.…”

“…4 and Table 2. The index <  n 1 , n 2 , n 3 , n 4  > is considered as the CSRO type, in which n i indicates the atomic number in the chemical component 32 . For instance, index < 11, 1, 1, 0 > in Fig.…”

“…1 (3 Å) after the primary peak can be considered as the range of NN Fe atoms centered by Si, B, and P. While Fe atoms around P mainly focus in the region of lost electrons and larger magnetic moments, those around Si and B with weaker magnetization acquiring electrons are more than P. It reveals the truth that the charge transfer between Fe and metalloid elements enable the free electrons of Fe to excite to high spin state and strengthen overall magnetic moment. Moreover, the supplement of P improves the ability of Fe losing electrons due to strong attractive interaction between them, leading to more exited electrons, which results in superior soft-magnetic characteristics and glass formation ability to corresponding character of FeSiB alloys 32 . Meanwhile, four NN Fe atoms of P obtain 0.02 e , 0.04 e , 0.05 e , and 0.06 e from their neighboring Fe and Si atoms, respectively, which results from stronger interaction between their ambient Fe/Si and them.…”