Magnetic properties and magnetocaloric effect of DyCo.sub.9./sub.Si.sub.4./sub.

0585653 - FZÚ 2025 RIV NL eng J - Journal Article
Tsujii, N. - Miyake, A. - Tokunaga, M. - Valenta, Jaroslav - Sakurai, H.
Magnetic properties and magnetocaloric effect of DyCo₉Si₄.
Journal of Alloys and Compounds. Roč. 980, April (2024), č. článku 173653. ISSN 0925-8388. E-ISSN 1873-4669
Institutional support: RVO:68378271
Keywords : DyCo₉Si₄ * intermetallic compound * magnetization * magnetocaloric effect
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.2, year: 2022

Polycrystalline samples of DyCo9Si4 with the tetragonal LaFe9Si4-type structure have been synthesized by arc melting and high-temperature annealing. Results of the magnetization M and specific heat Cp measurements show the existence of two magnetic anomalies at TC = 40 K and Tm = 20 K. The transition at TC = 40 K is attributed to the ferromagnetic transition of the Co sublattice. The magnetic moments of Dy3+ appear to align gradually below TC, and almost fixed below Tm, at which a broad maximum in Cp has been observed. Field-dependent M at T = 2 K up to H = 7 T suggested that the magnetic moment of Dy3+ is coupled antiferromagnetically with those of Co, forming a ferrimagnetic structure. Magnetization measurements up to 50 T at low temperatures using a pulse magnet demonstrated a spin-flip transition around H = 20 T, above which the magnetic moments of Co and Dy are in parallel.
Permanent Link: https://hdl.handle.net/11104/0353351