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Magnetic and magnetocaloric properties of some ferrimagnetic compounds

E. BURZO1,* , I.G.POP2, D. N. KOZLENKO3

Affiliation

  1. Faculty of Physics, Babes-Bolyai University Cluj-Napoca, Romania
  2. Emmanuel University, Oradea
  3. Institute for Nuclear Research, Dubna, Rusia

Abstract

The magnetocaloric effects in RCo2, where R is a heavy rare−earth, GdAl2, GdNi5, (GdxY1-x)2Co7B3 and RFe2 (R=Y,Er) compounds are analysed in correlation with magnetic properties. In case of ferrimagnetic compounds, when rare-earth and transition metal sublattice magnetizations are strongly coupled, the high values of entropy change can be seen at the Curie temperatures. When the strength of this coupling is relatively, small, there is a high variation of rare-earth sublattices magnetizations and consequently the maxima values of the entropy changes are evidenced at lower temperatures than the Curie points. In these cases there are large linewidth, δTm, of the ΔS vs. T dependences and consequently high values of the specific renormalized cooling power are shown..

Keywords

Rare−earth compounds, Magnetic properties, Magnetocaloric effect.

Submitted at: April 14, 2010
Accepted at: May 26, 2010

Citation

E. BURZO, I.G.POP, D. N. KOZLENKO, Magnetic and magnetocaloric properties of some ferrimagnetic compounds, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 1105-1113 (2010)