Anisotropic magnetocaloric effect in HoAlGa polycrystalline compound

Zhang Yan,Xiong Jiefu,Zhao Tongyun,Zuo Shulan,Dong Qiaoyan,Zheng Xinqi,Shen Baogen

doi:10.1063/1.5007130

Abstract

In this work, a nonnegligible anisotropic magnetocaloric effect (MCE) in HoAlGa polycrystalline compounds has been observed. With temperature increasing, the HoAlGa compound undergoes two kinds of magnetic transitions at 19 K and 31 K, respectively, the later has been recognized as an ordinary antiferromagnetic to paramagnetic (AFM-PM) transition. The -ΔS peak of HoAGa reaches 5.4 J/kg K and 1.5 J/kg K at 35 K along parallel and perpendicular texture directions respectively, for a field change of 0-5 T. The result indicates that the HoAlGa polycrystalline compounds with excellent anisotropic MCE can be expected to have effective magnetic refrigeration applications in low temperature range.

Highlights

It is well known that magnetic materials impact almost every aspect in our life from household appliances to aerospace field
Magnetic refrigeration based on the magnetocaloric effect (MCE) has been demonstrated to be a new-style application of functional magnetic materials
X-ray diffraction patterns of HoAlGa polycrystalline samples were obtained at room temperature

Summary

INTRODUCTION

It is well known that magnetic materials impact almost every aspect in our life from household appliances to aerospace field. Magnetic refrigeration based on the magnetocaloric effect (MCE) has been demonstrated to be a new-style application of functional magnetic materials. Observed giant rotating MCE in textured DyNiSi polycrystalline material in 2015, for the first time.[11] Rare-earth-based uniaxial intermetallic of RGa2 compounds have been studied experimentally as well as theoretically.[12,13,14] Complex field-temperature magnetic phase diagrams of RGa2 below TN, characterized by additional transitions, and multistep metal-magnetic processes at low temperature have been reported detailedly. A nonnegligible anisotropic MCE in HoAlGa polycrystalline compound has been observed due to the texture structure

EXPERIMENTAL DETAILS

RESULTS AND DISCUSSION

CONCLUSION