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Title: Effects of Zn additions to highly magnetoelastic FeGa alloys

Fe{sub 1−x}M{sub x} (M = Ga, Ge, Si, Al, Mo and x ∼ 0.18) alloys offer an extraordinary combination of magnetoelasticity and mechanical properties. They are rare-earth-free, can be processed using conventional deformation techniques, have high magnetic permeability, low hysteresis, and low magnetic saturation fields, making them attractive for device applications such as actuators and energy harvesters. Starting with Fe-Ga as a reference and using a rigid-band-filling argument, Zhang et al. predicted that lowering the Fermi level by reducing the total number of electrons could enhance magnetoelasticity. To provide a direct experimental validation for Zhang's hypothesis, elemental additions with lower-than-Ga valence are needed. Of the possible candidates, only Be and Zn have sufficient solubility. Single crystals of bcc Fe-Ga-Zn have been grown with up to 4.6 at. % Zn in a Bridgman furnace under elevated pressure (15 bars) in order to overcome the high vapor pressure of Zn and obtain homogeneous crystals. Single-crystal measurements of magnetostriction and elastic constants allow for the direct comparison of the magnetoelastic coupling constants of Fe-Ga-Zn with those of other magnetoelastic alloys in its class. The partial substitution of Ga with Zn yields values for the magnetoelastic coupling factor, −b{sub 1}, comparable to those of the binary Fe-Ga alloy.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [1] ;  [4] ;  [5] ;  [6]
  1. Division of Materials Sciences and Engineering, Ames Laboratory, Ames, Iowa 50011 (United States)
  2. (United States)
  3. Metallurgy and Fasteners Branch, Naval Surface Warfare Center, Carderock Division, Maryland 20817 (United States)
  4. University of Louisiana at Lafayette, Louisiana 70504 (United States)
  5. Clark Associates, Adelphi, Maryland 20783 (United States)
  6. Spectrum Technology Group, Inc., Gaithersburg, Maryland 20877 (United States)
Publication Date:
OSTI Identifier:
22410163
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTUATORS; BCC LATTICES; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; COUPLING CONSTANTS; CRYSTAL GROWTH; DEFORMATION; FERMI LEVEL; GALLIUM ALLOYS; HYSTERESIS; IRON ALLOYS; MAGNETIC SUSCEPTIBILITY; MAGNETOSTRICTION; MECHANICAL PROPERTIES; MONOCRYSTALS; VAPOR PRESSURE; ZINC ADDITIONS