Thermal-history dependent magnetoelastic transition in (MN, FE)2(P, SI)

X. Miao, L. Caron, Z. Gercsi, A. Daoud-Aladine, N. Van Dijk, K. G. Sandeman, E. Bruck

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

(Mn, Fe)2(P, Si)-type compounds are, to date, the most promising materials for refrigeration and energy conversion applications due to the combination of highly tunable giant magnetocaloric effect (GMCE) and low material cost.[1, 2] The GMCE of these compounds originates from the first-order magnetoelastic transition around the magnetic phase-transition temperature TC. However, the phase-transition temperature shows a peculiar thermal-history dependence in these compounds. As-prepared (Mn, Fe)2(P, Si) displays a significantly lower TC upon first cooling than on second and subsequent cooling processes. Since this behavior is only observed in as-prepared samples it is called the 'virgin effect'. The difference in TC between the first and second cooling processes of the as-prepared sample, hereafter referred to as ΔTC0, is taken as a measure of how strong the virgin effect is. The virgin effect is not exclusive to (Mn, Fe)2(P, Si) compounds being observed in other GMCE materials[3, 4], however its origin was for a long time unknown. In this study, we report our high-resolution neutron diffraction experiments that finally shed light on the origin of the virgin effect. Additionally, recovery of the virgin effect induced by thermal activation was observed experimentally.

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Electronic)9781479973224
DOIs
Publication statusPublished - 2015
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 11 May 201515 May 2015

Conference

Conference2015 IEEE International Magnetics Conference, INTERMAG 2015
CountryChina
CityBeijing
Period11/05/1515/05/15

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