Magnetocaloric effect in the intermetallic compound DyNi
S. K. Tripathy (1), K. G. Suresh (1), R. Nirmala (2), A. K. Nigam (2), and S. K. Malik (2) ((1)Department of Physics, I.I.T. Bombay, Mumbai, India, (2) Tata Institute of Fundamental Research, Mumbai, India)
TL;DR
This study investigates the magnetocaloric effect in DyNi, revealing significant entropy and temperature changes linked to field-induced spin-flop transitions, with potential implications for magnetic refrigeration.
Contribution
It provides the first detailed measurement of the magnetocaloric effect in DyNi and links it to its metamagnetic behavior and noncollinear magnetic structure.
Findings
Maximum entropy change of 19 Jkg-1K-1 at 60 kOe
Maximum temperature change of 4.5 K at 60 kOe
Large magnetocaloric effect due to spin-flop metamagnetism
Abstract
Magnetic and heat capacity measurements have been carried out on the polycrystalline sample of DyNi which crystallizes in the orthorhombic FeB structure (space group Pnma). This compound is ferromagnetic with a Curie temperature of 59 K. Magnetization-field isotherms at low temperatures shows a step-like behavior characteristic of metamagnetic transitions. The magnetocaloric effect has been measured both in terms of isothermal magnetic entropy change and adiabatic temperature change for various applied magnetic fields. The maximum values of the entropy change and the temperature change are found to be 19 Jkg-1K-1 and 4.5 K, respectively, for a field of 60 kOe. The large magnetocaloric effect is attributed to the field-induced spin-flop metamagnetism occurring in this compound, which has a noncollinear magnetic structure at low fields.
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