High field measurement of the magnetocaloric effect in MnFe(P, Si) materials

H. Yibole, F. Guillou, G. Porcari, A. P. Kamantsev, J. Cwik, V. Koledov, E. Bruck

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

Abstract

Recently, materials undergoing a first-order magnetic transition (FOMT) near room temperature have attracted much attentions due to the possibility to use their large magnetocaloric effect (MCE) for magnetic refrigeration [1]. Among them, the MnFe(P, X) (X = As, Ge, Si, B) family turns out to be one of the most promising due to the large isothermal entropy change ΔS, adiabatic temperature change ΔTad, a tunable Curie temperature (TC) and the practical advantages. Till now, most of the MCE studies on MnFe(P, X) focused on the intermediate magnetic field range (B ≤ 2T) as it is the most relevant field for applications [2]. However, extending the field range of the MCE derivation is important from both fundamental and practical points of view. On one hand, it allows one to address the field dependence of the MCE quantities, the possible influence of the critical point, etc; On the other hand, high field ΔS or ΔTad data are useful for the optimization of the MCE at intermediate field. Indeed, at first glance, one can consider for FOMT that the ΔS or ΔTad will saturate above a given field value (B∗(ΔS) or B∗(ΔT)). The point is that in Giant-MCE materials, it might be advantageous to bring these B∗ (often at high field) as close as possible to the field used in application. Understanding the field dependence of ΔS, ΔTd and quantifying the B∗ in MnFe(P, X) is required for further optimizations.

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
EditorsDan Wei
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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