The anomalous staircase-like magnetization behavior and giant magnetocaloric effect in a Fe–Mn-Ga magnetic shape memory alloy

H. Yang, K. An, Z. H. Nie, Y. D. Wang, B. Tang, T. Peng

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The anomalous staircase-like magnetization behavior has been investigated in a Fe–Mn-Ga magnetic shape memory alloy. Here, we elucidate the underlying mechanism for such anomalous magnetic behavior is caused by the magnetic-field-induced structural transformation occurring at low temperature. The reversal of structural phase transformation in a sufficient thermodynamics area is accounted for the abrupt changes of the magnetization behavior. Moreover, a giant magnetocaloric effect with isothermal entropy change of ~60 J kg−1K−1 under 5 T magnetic field was discovered, which is due to the antiferromagnetic to ferromagnetic transition, different from the previous report in magnetic shape memory alloys. The present work provides insights into the interplay between magnetism and structure in magnetic shape memory alloys, and instructive understanding of the anomalous staircase-like magnetization behavior in other materials undergoing a magnetostructural transition.

Original languageEnglish
Article number106975
JournalIntermetallics
Volume127
DOIs
StatePublished - Dec 2020

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).This work was supported by Fundamental Research Founds for the Provincial Universities (2018-KYYWF-0920). H. Y. would like to thank the China Scholarship Council for the financial support during the visit to University of Tennessee, TN and SNS, ORNL. The authors thank H. Bei from ORNL for helping prepare the sample. Neutron scattering experiment was carried out at Spallation Neutron Source (SNS) which is a user facility sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences (BES), U.S. Department of Energy. The neutron experimental support of Dr. A. Huq is acknowledged. This work was supported by Fundamental Research Founds for the Provincial Universities (2018-KYYWF-0920). H. Y. would like to thank the China Scholarship Council for the financial support during the visit to University of Tennessee , TN and SNS , ORNL . The authors thank H. Bei from ORNL for helping prepare the sample. Neutron scattering experiment was carried out at Spallation Neutron Source ( SNS ) which is a user facility sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences ( BES ), U.S. Department of Energy. The neutron experimental support of Dr. A. Huq is acknowledged.

Keywords

  • Fe–Mn-Ga alloy
  • Giant magnetocaloric effect
  • Magnetic shape memory alloy
  • Martensitic transformation

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