Magnetism and magnetocaloric effect in YNi sub(4)Si-type RNi sub(4)Si (R = Ce, Gd, Tb and Dy) compounds

Magnetic properties and magnetocaloric effect of YNi sub(4)Si-type RNi sub(4)Si (R = Ce, Gd, Tb and Dy) compounds have been investigated. Magnetic measurements indicate the intermediate valence state of cerium in YNi sub(4)Si-type CeNi sub(4)Si. The magnetocaloric effect of GdNi sub(4)Si, TbNi sub(4...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2015-03, Vol.378, p.221-227
Main Authors: Morozkin, A V, Nirmala, R, Malik, S K
Format: Article
Language:English
Subjects:
Cerium
Dysprosium
Entropy
Hysteresis loops
Isotherms
Magnetic measurement
Magnetic properties
Magnetism
Mathematical analysis
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Summary:Magnetic properties and magnetocaloric effect of YNi sub(4)Si-type RNi sub(4)Si (R = Ce, Gd, Tb and Dy) compounds have been investigated. Magnetic measurements indicate the intermediate valence state of cerium in YNi sub(4)Si-type CeNi sub(4)Si. The magnetocaloric effect of GdNi sub(4)Si, TbNi sub(4)Si and DyNi sub(4)Si are calculated in terms of isothermal magnetic entropy change and they reach maximum values of - 22.9 J/kg K, - 13.5 J/kg K and - 15.6J/kg K for a field change of 140 kOe near ~ 28 K, 47 K and 27 K and they show maximum values of - 12.7 J/kg K, - 7.8 J/kg K and - 9.3 J/kg K for a field change of 50 kOe near ~ 28 K, 42 K and 22 K, respectively. In contrast to GdNi sub(4)Si, the magnetization-field isotherms for TbNi sub(4)Si and DyNi sub(4)Si exhibit hysteresis loop at 2 K due to strong magnetocrystalline anisotropy.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2014.11.036