Tablelike magnetocaloric effect and enhanced refrigerant capacity inEuO1−δthin films,Physical Review Materials

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Tablelike magnetocaloric effect and enhanced refrigerant capacity inEuO1−δthin films
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-09-10 , DOI: 10.1103/physrevmaterials.5.094404
P. Lampen-Kelley ₁ , R. Madhogaria ₁ , N. S. Bingham ₁ , M. H. Phan ₁ , P. M. S. Monteiro ₂ , N.-J. Steinke _{2,

3} , A. Ionescu ₂ , C. H. W. Barnes ₂ , H. Srikanth ₁

Affiliation

The effect of electron doping of

Eu O_{1 − δ}

thin films through oxygen vacancies (

δ = 0

, 0.025, and 0.09) upon the magnetocaloric response is presented. The films each showed a paramagnetic to ferromagnetic transition around 65 K, with an additional magnetic ordering transition at higher temperatures in the oxygen deficient samples. All transitions are observed to be of second order. A maximum magnetic entropy change of 6.4 J/kg K over a field change of 2 T with a refrigerant capacity of 223 J/kg was found in the sample with

δ = 0

, and in all cases the refrigerant capacities of the thin films under study were found to exceed that reported for bulk EuO. Adjusting the oxygen content was shown to produce tablelike magnetocaloric effects, desirable for ideal Ericsson-cycle magnetic refrigeration. These films are thus excellent candidates for small-scale magnetic cooling technology in the liquid nitrogen temperature range.

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