Magnetic coupling between Gd and Pr ions and magnetocaloric effect in Gd0.5Pr0.5Al2 compound

作者：Carvalho A Magnus G^*; Garcia F; de Sousa V S R; von Ranke P J; Rocco D L; Loula G D; de Carvalho E J; Coelho A A; da Silva L M; Gandra F C G

来源：Journal of Magnetism and Magnetic Materials, 2009, 321(19): 3014-3018.

DOI：10.1016/j.jmmm.2009.04.068

• Rare-earth alloy
• X-ray magnetic circular dichroism
• Ferrimagnetism
• Magnetocaloric effect

In this work, we report the theoretical and experimental investigations on the magnetic and magnetocaloric properties for Gd0.5Pr0.5Al2 compound in different magnetic fields. The magnetization features Gd0.5Pr0.5Al2 is ferrimagnetic at low temperatures. We also present data from X-ray magnetic circular dichroism (XMCD) experiments for this compound, with which we have confirmed that the magnetic moments of the Pr ions are antiparallel to the magnetic moments of the Gd ions. The magnetocaloric parameters, Delta T-S and Delta S-T, were obtained from calorimetric data and both curves present normal and inverse magnetocaloric effect. A theoretical model for ferrimagnetic coupling, including the crystalline electrical field anisotropy, was used to describe the Delta T-S and Delta S-T experimental results.

• 出版日期2009-10