Large magnetically induced strains in Ni50Mn28.7Ga21.3 driven with collinear field and stress Lograsso, Thomas Malla, A. Schlagel, Deborah Dapino, M. Lograsso, Thomas Schlagel, Deborah
dc.contributor.department Ames Laboratory 2018-02-13T15:13:50.000 2020-06-29T23:25:19Z 2020-06-29T23:25:19Z Sun Jan 01 00:00:00 UTC 2006 2013-09-25 2006-03-20
dc.description.abstract <p>Despite the huge magnetic-field-induced strain (MFIS) of up to 9.5% exhibited by certain Ni–Mn–Ga alloys, their usefulness in applications is severely hindered by the electromagnet device needed for driving the alloys with a magnetic field and orthogonal loading stress. In this paper we present macroscopic measurements obtained from a single crystal of Ni<sub>50</sub>Mn<sub>28.7</sub>Ga<sub>21.3</sub> which demonstrate a large reversible MFIS of −4100 ppm when the alloy is driven with quasistatic magnetic fields and fixed compressive stresses applied collinearly along the [001] axis. This collinear configuration marks a fundamental difference with prior research in the field and points to the existence in this alloy of stable bias or residual stresses—likely associated with pinning sites in the alloy—which provide the energy necessary to restore the original variant state when the field is reversed. We present macroscopic magnetomechanical measurements which show a decrease of the MFIS with increasing stress loading and a stiffening of the alloy with increasing dc fields. The latter behavior is phenomenologically similar to the Δ<em>E</em> effect in magnetostrictive materials. The large reversible MFIS and tunable stiffness properties exhibited by this alloy could enable practical Ni–Mn–Ga actuators for high-deflection, low-force applications which due to being driven by a solenoid transducer are more compact, energy efficient, and faster than their electromagnet counterpart. A thermodynamic model is presented which qualitatively characterizes the decay in MFIS with increasing compressive external load and provides a starting point for the characterization, design, and control of the proposed Ni–Mn–Ga devices.</p>
dc.description.comments <p>The following article appeared in <em>Journal of Applied Physics</em> 99 (2006): 063903 and may be found at <a href="" target="_blank"></a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1124
dc.identifier.contextkey 4629953
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_pubs/133
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 19:49:04 UTC 2022
dc.source.uri 10.1063/1.2177927
dc.subject.disciplines Condensed Matter Physics
dc.subject.disciplines Metallurgy
dc.subject.keywords nickel alloys
dc.subject.keywords manganese alloys
dc.subject.keywords gallium alloys
dc.subject.keywords magnetostriction
dc.subject.keywords actuators
dc.subject.keywords stress effects
dc.subject.keywords internal stresses
dc.subject.keywords elasticity
dc.subject.keywords thermodynamics
dc.title Large magnetically induced strains in Ni50Mn28.7Ga21.3 driven with collinear field and stress
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 316ee29f-99a9-49bc-a048-0f43caf97aa5
relation.isAuthorOfPublication 220ce8a4-546b-4118-8d44-911799a0ffa1
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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