Observation of a ferromagnetic-to-paramagnetic phase transition in Ce_0.65Mg_0.35Co₃

¹ School of Electronics and Information, Hangzhou Dianzi University - Hangzhou, Zhejiang 310018, China
² National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nano Technology, Nanjing University - Nanjing, Jiangsu 210093, China
³ Research Institute of Materials Science & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology, Shanxi Normal University - Linfen, Shanxi 041004, China

^(a) zmzhang@hdu.edu.cn
^(b) wangdh@hdu.edu.cn

Received: 18 July 2019
Accepted: 28 October 2019

Abstract

are promising candidates for the permanent magnets since they can show ferromagnetism and large anisotropy by substituting Mg for Ce in a paramagnetic compound. In this work, a room-temperature ferromagnetism with a second-order magnetic phase transition is observed in the (CMC) compound prepared by a cold crucible levitation melting method. Based on the DC magnetization data, the critical phenomenon around the phase transition point () in CMC is investigated and the critical exponents for spontaneous magnetization, for susceptibility and for critical isothermal magnetization are determined independently by three different data processing techniques including the modified Arrott plot, Kouvel-Fisher plot, and critical isotherm analysis. It is noteworthy that the magnetizations obey the scaling equation, indicating that the critical parameters including T_c, , and are reliable and self-consistent. The calculation of spin interaction with the obtained critical exponents further suggests a long-range ferromagnetic coupling with in CMC.