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The Influence of Composition and Field Annealing on Magnetic Properties of FeCo-Base Amorphous and Nanocomposite Alloys

Published

Author(s)

Freemon Johnson, C Y. Um, M E. McHenry, H Garmestani

Abstract

We report the influence of composition and very high transverse field annealing on the magnetic properties and structure of four FeCo-based amorphous and nanocomposite alloy compositions. The compositions (Fe50Co50)89Zr7B4 and (Fe65Co35)89Zr7B4 investigated changing the Fe:Co ratio from 50:50 to 65:35. (Fe50Co50)85Zr2Nb4B8.5 investigated Nb substitution for Zr in an FeCo-base alloy. This substitution is shown to increase the magnetostrictive constant, ?S, of the nanocomposite alloy from 36 ppm to 54 ppm. The composition (Fe65Co35)84Cr5Zr7B4 investigated the influence of Cr on intergranular coupling across the amorphous matrix. Samples of each composition were annealed in the amorphous state at 300 C and in the nanocomposite state at 600 C. Field annealing was performed in 17 T transverse field in an inert atmosphere. Magnetic properties were measured between 60 Hz to 1 MHz with an automatic recording hysteresisgraph. Quasistatic magnetic properties were measured with a vibrating sample magnetometer. The mass specific power loss of the alloys decreased with field annealing in both the nanocomposite and amorphous states for some frequency and induction combinations. Furthermore, the hysteresis loops are sheared after field annealing, indicating a transverse magnetic anisotropy. The nanocomposite (Fe50Co50)85Zr2Nb4B8.5 composition has a lower relative permeability than the other compositions. P.A.C.S. Codes
Citation
Journal of Applied Physics

Keywords

high transverse field annealing, hysteresisgraph, magnetic properties, magnetostrictive, nanocomposite, Quasistatic magnetic properties

Citation

Johnson, F. , Um, C. , McHenry, M. and Garmestani, H. (2008), The Influence of Composition and Field Annealing on Magnetic Properties of FeCo-Base Amorphous and Nanocomposite Alloys, Journal of Applied Physics (Accessed March 4, 2024)
Created October 16, 2008