Extraordinary magnetoelasticity and lattice softening in bcc Fe-Ga alloys

dc.contributor.author Clark, A.
dc.contributor.author Lograsso, Thomas
dc.contributor.author Hathaway, K.
dc.contributor.author Wun-Fogle, M.
dc.contributor.author Restorff, J.
dc.contributor.author Lograsso, Thomas
dc.contributor.author Keppens, V.
dc.contributor.author Petculescu, G.
dc.contributor.author Taylor, R.
dc.contributor.department Ames Laboratory
dc.date 2018-02-13T15:15:26.000
dc.date.accessioned 2020-06-29T23:17:42Z
dc.date.available 2020-06-29T23:17:42Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2003
dc.date.embargo 2013-09-25
dc.date.issued 2003-05-15
dc.description.abstract <p>Extraordinary magnetostrictive behavior has been observed in Fe-Ga alloys with concentrations of Ga between 4% and 27%. <em>λ</em><sub>100</sub> exhibits two peaks as a function of Ga content. At room temperature, <em>λ</em><sub>100</sub> reaches a maximum of 265 ppm near 19% Ga and 235 ppm near 27% Ga. For compositions between 19% and 27%, <em>λ</em><sub>100</sub> drops sharply to a minimum near 24% Ga and exhibits an anomalous temperature dependence, decreasing by as much as a factor of 2 at low temperatures. This unusual magnetostrictive behavior is interpreted on the basis of a single maximum in the magnetoelastic coupling ∣<em>b</em><sub>1</sub>∣ of Fe with increasing amounts of nonmagnetic Ga, combined with a strongly temperature dependent elastic shear modulus (<em>c</em><sub>11</sub>−<em>c</em><sub>12</sub>) which approaches zero near 27% Ga. <em>λ</em><sub>111</sub> is significantly smaller in magnitude than <em>λ</em><sub>100</sub> over this composition range, and has an abrupt change in sign from negative for low Ga concentrations to positive for a concentration of Ga near 21%.</p>
dc.description.comments <p>Copyright 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.</p> <p>The following article appeared in <em>Journal of Applied Physics</em> 93 (2003): 8621 and may be found at <a href="http://dx.doi.org/10.1063/1.1540130" target="_blank">http://dx.doi.org/10.1063/1.15401</a><a href="http://dx.doi.org/10.1063/1.1540130" target="_blank">30</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_conf/31/
dc.identifier.articleid 1027
dc.identifier.contextkey 4630298
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_conf/31
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/6607
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ameslab_conf/31/a133.pdf|||Fri Jan 14 23:30:04 UTC 2022
dc.source.uri 10.1063/1.1540130
dc.subject.disciplines Condensed Matter Physics
dc.subject.disciplines Metallurgy
dc.subject.keywords iron alloys
dc.subject.keywords gallium alloys
dc.subject.keywords magnetoelastic effects
dc.subject.keywords magnetostriction
dc.subject.keywords ferromagnetic materials
dc.subject.keywords elastic constants
dc.subject.keywords soft modes
dc.subject.keywords elastic moduli
dc.title Extraordinary magnetoelasticity and lattice softening in bcc Fe-Ga alloys
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 316ee29f-99a9-49bc-a048-0f43caf97aa5
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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