Magnetocaloric effect in antiferromagnetic Dy3Co compound

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2010-06, Vol.99 (4), p.853-858
• Main Authors: Shen, Jun, Zhao, Jin-Liang, Hu, Feng-Xia, Rao, Guang-Hui, Liu, Guang-Yao, Wu, Jian-Feng, Li, Yang-Xian, Sun, Ji-Rong, Shen, Bao-Gen
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Machines; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetocaloric effect, magnetic cooling; Manufacturing; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-010-5613-4

Magnetic properties and magnetocaloric effects (MCEs) of the Dy 3 Co compound are studied. Two successive magnetic transitions: the antiferromagnetic (AFM)-to-AFM transition at T AF =29 K and the AFM-to-paramagnetic (PM) transition with increasing temperature at the Néel temperature T N =44 K are observed. Dy 3 Co undergoes a field-induced metamagnetic transition from the AFM to the ferromagnetic (FM) state below  T N , giving rise to a large MCE. The maximal value of magnetic entropy change Δ S m is −13.9 J/kg K with a refrigerant capacity (RC) of 498 J/kg around T N for a field change of 0–5 T. A sign change of MCE in Dy 3 Co with magnetic field and temperature is observed near the critical field where the metamagnetic transition occurs.