Enhanced magnetic refrigeration properties in Mn-rich Ni-Mn-Sn ribbons by optimal annealing

Yu Zhang; Linlin Zhang; Qiang Zheng; Xinqi Zheng; Ming Li; Juan Du; Aru Yan

doi:10.1038/srep11010

Enhanced magnetic refrigeration properties in Mn-rich Ni-Mn-Sn ribbons by optimal annealing

Sci Rep. 2015 Jun 9:5:11010. doi: 10.1038/srep11010.

Authors

Yu Zhang¹, Linlin Zhang², Qiang Zheng³, Xinqi Zheng⁴, Ming Li¹, Juan Du¹, Aru Yan¹

Affiliations

¹ Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, 315201, People's Republic of China.
² 1] Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, 315201, People's Republic of China [2] School of Materials Science and Engineering, Ningbo University of Technology, Ningbo, 315016, People's Republic of China.
³ School of Materials Science and Engineering, Ningbo University of Technology, Ningbo, 315016, People's Republic of China.
⁴ School of Materials Science and Engineering, University of Science &Technology of Beijing, 100083, People's Republic of China.

Abstract

The influence of annealing time on temperature range of martensitic phase transition (ΔT(A-M)), thermal hysteresis (ΔThys), magnetic hysteresis loss (ΔMhys), magnetic entropy change (ΔS(M)) and relative refrigeration capacity (RC) of the Mn-rich Ni43Mn46Sn11 melt spun ribbons have been systematically studied. By optimal annealing, an extremely large ΔS(M) of 43.2 J.kg(-1)K(-1) and a maximum RC of 221.0 J.kg(-1) could be obtained respectively in a field change of 5 T. Both ΔT(A-M) and ΔThys decreases after annealing, while ΔMhys and ΔS(M) first dramatically increase to a maximum then degenerates as increase of annealing time. A large effective cooling capacity (RC(eff)) of 115.4 J.kg(-1) was achieved in 60 min annealed ribbons, which increased 75% compared with that unannealed ribbons. The evolution of magnetic properties and magnetocaloric effect has been discussed and proved by atomic ordering degree, microstructure and composition analysis.

Publication types

Research Support, Non-U.S. Gov't