Ferrimagnetic Materials: State of the Art and Future Perspective

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 734

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Department of Physics, University of Bordeaux, CEDEX, 33405 Talence, France
Interests: statistical quantum field theory; lattice models in statistical physics; magnetic phase transitions; electronic paramagnetic resonance (EPR); magnetic nanoparticles
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Special Issue Information

Dear Colleagues,

Since the beginning of the 1990s, with the introduction of organic ligands between magnetic cations, magnetochemistry has undergone significant developments. This molecular “do-it-yourself kit’’ has allowed us to synthetize new ferrimagnets (initially considered to be exclusive antiferromagnets by Néel). As a result, through the full control of their microscopic magnetic properties, it is now possible to impose the ferromagnetic or antiferromagnetic character of exchange energy, the magnitude of the magnetic moment per site, the dimensionality of spin lattices (1D, 2D, or 3D) and transport properties, notably relating to molecular electronics, magnetic semiconductors, superconductors, and spintronics; however, the hysteresis phenomenon is also important for industrial applications. Simultaneously, new theoretical modeling challenges have emerged.

Dr. Jacques Curély
Guest Editor

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Keywords

  • ferrimagnetism
  • antiferromagnetism
  • ferromagnetism
  • Heisenberg couplings
  • Ising (z–z) couplings
  • x–y couplings
  • insulator
  • magnetic semiconductor
  • molecular electronics
  • superconductors
  • spintronics

Published Papers (1 paper)

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Research

12 pages, 2436 KiB  
Article
Effect of the Core–Shell Exchange Coupling on the Approach to Magnetic Saturation in a Ferrimagnetic Nanoparticle
by Sergey V. Komogortsev, Sergey V. Stolyar, Alexey A. Mokhov, Vladimir A. Fel’k, Dmitriy A. Velikanov and Rauf S. Iskhakov
Magnetochemistry 2024, 10(7), 47; https://doi.org/10.3390/magnetochemistry10070047 - 1 Jul 2024
Viewed by 565
Abstract
The generally accepted model of the magnetic structure of an iron oxide core–shell nanoparticle includes a single-domain magnetically ordered core surrounded by a layer with a frozen spin disorder. Due to the exchange coupling between the shell and core, the spin disorder should [...] Read more.
The generally accepted model of the magnetic structure of an iron oxide core–shell nanoparticle includes a single-domain magnetically ordered core surrounded by a layer with a frozen spin disorder. Due to the exchange coupling between the shell and core, the spin disorder should lead to nonuniform magnetization in the core. Suppression of this inhomogeneity by an external magnetic field causes the nonlinear behavior of the magnetization as a function of the field in the region of the approach to magnetic saturation. The equation proposed to describe this effect is tested using a micromagnetic simulation. Analysis of the approach to magnetic saturation of iron oxide nanoparticles at different temperatures using this equation can be used to estimate the temperature evolution of the core–shell coupling energy and the size of the uniformly magnetized nanoparticle core and the temperature behavior of this size. Full article
(This article belongs to the Special Issue Ferrimagnetic Materials: State of the Art and Future Perspective)
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