Improved magnetostriction of Fe₇₂Ga₂₈ boron doped alloys

Abstract

JOURNAL OF APPLIED PHYSICS 109, 07A934 (2011)

Improved magnetostriction of Fe72Ga28 boron doped alloys Cristina Bormio-Nunes,1,a) Claudio Teodoro dos Santos,1 Inae^ Fernandes Leandro,1 Reiko Sato Turtelli,2 Roland Gro¨ ssinger,2 and Muhammad Atif2 1Escola de Engenharia de Lorena, Dep. de Eng. de Materiais, Universidade de S. Paulo 12.602-810, Lorena, SP, Brazil 2Institute of Solid State Physics, Technical University Vienna, Vienna A-1040, Austria

(Presented 16 November 2010; received 24 September 2010; accepted 8 December 2010; published online 4 April 2011)

In order to investigate the effect of boron additions in the magnetostrictive behavior of Fe72Ga28 alloy, this alloy was doped with 0.5, 1.0, 1.5 and 2.0 at.% of boron. The results have shown that boron additions of 0.5 and 1.0% improve significantly the magnetostriction, the values being about two-fold higher compared to the undoped alloy. Microstructural evaluations suggest that boron additions suppress partially the D03 phase ordering, retaining the a-phase. Furthermore, the increase of lattice parameters of the a and D03 phases indicates that boron enters interstitially in the cubic lattice of these phases. Both effects are considered to be responsible for the increased magnetostriction observed in the (Fe0.72Ga0.28)99.5B0.5 and Fe0.72Ga0.28)99.0B1.0 alloys. VC 2011 American Institute of Physics. [doi:10.1063/1.3561782]