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Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Engineering Light-Element Modified LaFe11.6Si1.4 Compounds Enables Tunable Giant Magnetocaloric Effect.

Fengqi Zhang1,2, Ziying Wu2, Xiaofang Zhang3

  • 1JC STEM Lab of Energy and Materials Physics, Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 19, 2025
PubMed
Summary
This summary is machine-generated.

Light element doping in La(Fe,Si)13 materials enhances Curie temperature for magnetocaloric refrigeration. Fluorine doping maintains giant magnetocaloric effect, showing promise for solid-state cooling technologies.

Keywords:
La(Fe,Si)13light element dopingmagnetocaloric energy conversionsmagnetocaloric materialssynchrotron X‐ray and neutron diffractions

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thermodynamics

Background:

  • Magnetocaloric refrigeration offers a promising alternative to traditional compression-based cooling.
  • La(Fe,Si)13-based materials are key candidates for practical magnetocaloric applications.
  • Improving Curie temperature and tuning the giant magnetocaloric effect (GMCE) are crucial for development.

Purpose of the Study:

  • To investigate the impact of light element (C, F, S) doping on the properties of LaFe11.6Si1.4 compounds.
  • To explore strategies for enhancing Curie temperature (TC) and achieving tunable GMCE.
  • To understand the relationship between doping, microstructure, and magnetocaloric performance.

Main Methods:

  • Systematic experimental investigation of light element (C, F, S) modified LaFe11.6Si1.4 compounds.
  • Analysis of Curie temperature (TC), thermal hysteresis, and magnetic entropy change (|Δ sm|).
  • Determination of dopant site occupancy, microstructural observation, and analysis of metastable atomic changes.

Main Results:

  • All doped samples exhibited an increased TC with minimal impact on thermal hysteresis.
  • Fluorine doping maintained a significant GMCE, with a maximum magnetic entropy change of 19.2 J kg-1 K-1 at 2 T.
  • Interstitial doping proved more effective for shifting TC, but doping disrupted the first-order transition due to altered hybridization.

Conclusions:

  • Interstitial doping is an effective strategy for increasing TC in La(Fe,Si)13 materials.
  • The interplay between lattice pressure and covalent hybridization is critical for controlling magnetocaloric properties.
  • Fluorine doping offers a viable route to maintain GMCE while enhancing TC for advanced refrigeration.