Magnetism, magnetocaloric and magnetotransport properties of Dy5NiSi2 alloy

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2019-03, Vol.125 (3), p.1-7, Article 199
• Main Authors: Arun, K., Rashid, T. P., Curlik, Ivan, Ilkovic, Sergej, Reiffers, Marian, Dzubinska, Andrea, Nagalakshmi, R.
• Format: Article
• Language: English
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Critical field (superconductivity); Dysprosium compounds; Electric arc melting; Ferromagnetism; Intermetallic compounds; Machines; Magnetic properties; Magnetism; Magnetization; Magnetization curves; Magnetoresistance; Magnetoresistivity; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Refrigeration; Surfaces and Interfaces; Thin Films; Transport properties
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-019-2498-8

Systematic investigations were carried out on the magnetic, thermodynamic, transport and magnetocaloric properties of arc melted Dy 5 NiSi 2 compound. The polycrystalline compound shows two ferromagnetic (FM) transitions at T 1  = 44 K and T 2  = 72 K, respectively. The isothermal magnetization curves of T  = 2–40 K reveal the presence of metamagnetic transition at a critical field around 4 T. The magnetic entropy change (Δ S M ) computed from both isothermal magnetization and heat capacity data shows a maximum of 16.3 J/kg K at 72 K for a field change of 0–9 T. Also, the presence of two successive ferromagnetic transitions at T 1  = 44 K and T 2  = 72 K displays a table like magnetocaloric effect in a wide temperature range 29–137 K (Δ T cycle  = 108 K) with a refrigerant capacity of 580 J/kg for a field change of 0–9 T. It also exhibits considerable negative magnetoresistance of 11% in 9 T at 2 K. Hence, the results on Dy 5 NiSi 2 alloy are interesting for low-temperature magnetic refrigeration.