Applicability of scaling behavior and power laws in the analysis of the magnetocaloric effect in second-order phase transition materials

Carlos Romero-Muñiz, Ryo Tamura, Shu Tanaka, Victorino Franco

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In recent years, universal scaling has gained renewed attention in the study of magnetocaloric materials. It has been applied to a wide variety of pure elements and compounds, ranging from rare-earth-based materials to transition metal alloys, from bulk crystalline samples to nanoparticles. It is therefore necessary to quantify the limits within which the scaling laws would remain applicable for magnetocaloric research. For this purpose, a threefold approach has been followed: (a) the magnetocaloric responses of a set of materials with Curie temperatures ranging from 46 to 336 K have been modeled with a mean-field Brillouin model, (b) experimental data for Gd has been analyzed, and (c) a 3D-Ising model - which is beyond the mean-field approximation - has been studied. In this way, we can demonstrate that the conclusions extracted in this work are model-independent. It is found that universal scaling remains applicable up to applied fields, which provide a magnetic energy to the system up to 8% of the thermal energy at the Curie temperature. In this range, the predicted deviations from scaling laws remain below the experimental error margin of carefully performed experiments. Therefore, for materials whose Curie temperature is close to room temperature, scaling laws at the Curie temperature would be applicable for the magnetic field range available at conventional magnetism laboratories (∼10 T), well above the fields which are usually available for magnetocaloric devices.

Original languageEnglish
Article number134401
JournalPhysical Review B
Volume94
Issue number13
DOIs
Publication statusPublished - 2016 Oct 3

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Magnetocaloric effects
Curie temperature
Scaling laws
Phase transitions
scaling laws
scaling
Transition metal alloys
Ising model
Magnetism
Thermal energy
thermal energy
Rare earths
margins
rare earth elements
transition metals
Magnetic fields
Nanoparticles
Crystalline materials
deviation
nanoparticles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Applicability of scaling behavior and power laws in the analysis of the magnetocaloric effect in second-order phase transition materials. / Romero-Muñiz, Carlos; Tamura, Ryo; Tanaka, Shu; Franco, Victorino.

In: Physical Review B, Vol. 94, No. 13, 134401, 03.10.2016.

Research output: Contribution to journalArticle

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