Study of Fe3Pd and related alloys for ferromagnetic shape memory

J. Cui, R. D. James

Research output: Contribution to journalConference articlepeer-review

26 Scopus citations

Abstract

Ferromagnetic shape memory refers to the behavior of certain alloys that undergo a reversible martensitic transformation and are also ferromagnetic. They undergo the usual shape memory effect by changing temperature, and they can also be made to undergo large changes of shape by applying a magnetic field. Alloys with composition near Fe3Pd undergo a highly reversible FCC to FCT transformation, have high saturation magnetization approximately 2/3 to that of Fe at room temperature, and therefore are good candidates for ferromagnetic shape memory. In this paper, the possibility of inducing a change of shape by rearranging variants of martensite with an applied field is explored. A key measurement for assessing this possibility is the magnetic anisotropy of a single variant of martensite. We measure this property by applying the appropriate stress to a single crystal to completely detwin it. Magnetization curves for the detwinned crystal are measured and the measurements are corrected for shape anisotropy and the stress. These measurements also settle an apparent discrepancy between the easy axis expected on the basis of Density Functional Theory (DFT) calculation with spin (c-axis), and those inferred from magnetomechancial measurements of James and Wuttig (a-axis).

Original languageEnglish (US)
Pages (from-to)2675-2678
Number of pages4
JournalIEEE Transactions on Magnetics
Volume37
Issue number4 I
DOIs
StatePublished - Jul 2001
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: Jan 7 2001Jan 11 2001

Bibliographical note

Funding Information:
Manuscript received October 13, 2000. This work was supported by ONR (N00014-99-1-0925 and N0014-95-1-1145), AFOSR/MURI (F49620-98-1-0433), ARO (DAAG55-98-1-0335) and NSF (DMS-0074043). The authors are with the Department of Aerospace Engineering and Mechanics, University of Minnesota, SE. Minneapolis, MN 55455 USA (e-mail: {cuijun; james}@aem.umn.edu). Publisher Item Identifier S 0018-9464(01)06391-9.

Keywords

  • FePd
  • Ferromagnetic
  • Magnetic anisotropy

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