Magnetostriction of Fe-rich FeSiB(P)NbCu amorphous and nanocrystalline soft-magnetic alloys

Murugaiyan, Premkumar and Mitra, Amitava and Patro, A K and Roy, Rajat K and Panda, Ashis K (2023) Magnetostriction of Fe-rich FeSiB(P)NbCu amorphous and nanocrystalline soft-magnetic alloys. Journal of Alloys and Compounds, 960 .

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The compositional effect of magneto-elastic and magnetostriction properties of Fe-rich Fe81B15-xPxSi2Nb1Cu1 (ii) Fe(82)B(14-x)PxSi(2)Nb(1)Cu(1) and (iii) Fe83B13-xPxSi2Nb1Cu1 (x = 0, 4, 8) amorphous and annealed nanocrystalline alloy ribbons were investigated. The present study adds knowledge to the limited magnetostriction literature available for Fe-rich nanocrystalline alloys by systematically varying the Fe and P content. A combination of Becker-Kersten and small angle magnetization rotation (SAMR) techniques has been employed for the magnetostriction (lambda s) evaluation. Both the as-quenched and nanocrystalline ribbons exhibit large positive magnetostriction and show strong compositional dependence to the P content. In the as-quenched condition, 4 at% P addition shows maximum magneto-elastic response and magnetostriction constant, with Fe81B11P4Si2Nb1Cu1 alloy exhibiting a maximum of + 52 ppm and P-free Fe83B13Si2Nb1Cu1 alloy exhibiting a minimum of + 27 ppm. In the nanocrystalline state, a slight reduction of magnetostriction is seen for all alloys, with a maximum of + 32 ppm (4 at% P) and a minimum of + 22 ppm (P-free) in Fe83 at% alloys. The unusual large magnetostriction of optimally annealed samples is attributed to the relatively low crystal volume fraction (30-45%) of nano-crystalline ribbons. The lowest magnetostriction of Fe83B13Si2Nb1Cu1 alloy in both as-quenched and annealed state is explained based on ribbon structural heterogeneity consisting of crystal nuclei and textured alpha-Fe surface crystallization. The study reveals a contradictory response of magneto-crystal anisotropy (grain size reduction) and magneto-elastic anisotropy to the P addition and ribbon structural heterogeneity. The study discusses the implications of the large magneto-elastic anisotropy associated with Fe-rich nanocrystalline ribbons and the way forward for improving their magnetic softness. (C) 2023 Elsevier B.V. All rights reserved.

Item Type:Article
Official URL/DOI:https://10.1016/j.jallcom.2023.170760
Uncontrolled Keywords:Melt-spinning, Fe-amorphous, nanocrystalline, soft-magnets, magnetostriction, magneto-elastic anisotropy, high B-S, surface crystallization, Cu, anisotropy, ribbon, glass
Divisions:Material Science and Technology
ID Code:9438
Deposited By:HOD KRIT
Deposited On:22 Sep 2023 16:42
Last Modified:22 Sep 2023 16:42
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