Abstract
The transition from para- to ferromagnetic behavior in magnetic systems can be considered to be a part of a general problem of the transition from quantum (one-particle) to classical (multiple-particle) behavior. Here we present a brief review of recent studies in electron magnetic resonance (EMR) and spin relaxation in situations which are at the borderline between paramagnetic and ferromagnetic cases. Most attention is paid to EMR in magnetic nanoparticles. It is shown that the giant spin model based on the quantum spin Hamiltonian can be successively applied for interpretation of the specific features observed in the experiment, such as a narrow spectral component and “forbidden” half-field resonances. Another example is the transformation of the level anticrossing typical for anisotropic EPR spectra of paramagnetic ions into the magnetic pseudoresonance (which manifests itself as a giant peak of radio-frequency absorption) observed in ferromagnets with axial anisotropy. Finally, an emergence and an intensification of the Bloch relaxation gradually replacing the Landau–Lifshit–Gilbert mechanism near the Curie point is clearly demonstrated in colossal magnetoresistance materials.
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Acknowledgements
The authors thank V.V. Demidov and A.E. Mefed for their help at different stages of this study. For one of the authors (V.A. A.), this work was carried out within the framework of the state task. N.N. would like to acknowledge support from NSF #1830886, AFOSR FA9550-18-1-0417 and DoD #W911NF1810472 grants.
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Atsarkin, V.A., Noginova, N. Electron Spin Resonance on the Border Between Para- and Ferromagnetism: Quantum versus Classical. Appl Magn Reson 51, 1467–1480 (2020). https://doi.org/10.1007/s00723-020-01213-1
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DOI: https://doi.org/10.1007/s00723-020-01213-1