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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Electronic structure and the magneto-caloric effect.

C Gruber1, P O Bedolla, P Mohn

  • 1Center for Computational Materials Science, Vienna University of Technology, Gußhausstraße 25/134, A-1040 Vienna, Austria.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 8, 2013
PubMed
Summary
This summary is machine-generated.

This study explores entropy changes driving the magneto-caloric effect (MCE) in magnetic materials. It identifies itinerant electron metamagnets as promising for large MCE, with findings aligning with experimental data.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thermodynamics

Background:

  • The magneto-caloric effect (MCE) is a phenomenon where magnetic materials change temperature in response to an external magnetic field.
  • Understanding entropy changes is crucial for optimizing MCE materials for magnetic refrigeration technologies.
  • Existing models often focus on localized magnetic moments, necessitating investigation into itinerant electron systems.

Purpose of the Study:

  • To theoretically investigate entropy changes associated with the magneto-caloric effect (MCE).
  • To explore MCE in both localized and itinerant electron magnetism.
  • To identify promising material classes for enhanced MCE applications.

Main Methods:

  • Theoretical analysis using the Weiss molecular field model for localized moments.
  • Application of Landau theory of phase transitions and spin fluctuation theory for itinerant electron magnetism.
  • First-principles calculations to connect Landau parameters with electronic band structure.

Main Results:

  • Itinerant electron metamagnets exhibit large magnetic moment changes in small external fields, indicating significant MCE potential.
  • Theoretical expressions were developed and applied to transition metals, alloys, and metamagnets like YCo2 and Fe2P.
  • Calculated MCE behavior shows reasonable agreement with experimental observations.

Conclusions:

  • Itinerant electron metamagnets are identified as highly promising candidates for efficient magneto-caloric effect applications.
  • The theoretical framework provides a direct link between electronic band structure and MCE properties.
  • The study validates theoretical predictions against experimental data for key magnetic materials.