Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. Founded at 2009

Magnetic viscosity and magnetic reversal processes of the heterogeneous Gd0,85Zr0,15(Co0,7Cu0,09Fe0,21)6,0 alloy

A.Yu.. Karpenkov, P.A. Rakunov, M.B. Lyakhova, E.M. Semenova, Yu..G. Pastushenkov

Tver State University

DOI: 10.26456/pcascnn/2025.17.077

Original article

Abstract: The results of experimental studies of the magnetic properties and relaxation processes of the alloy Gd0,85Zr0,15(Co0,7Cu0,09Fe0,21)6,0 are presented in this paper. The studied sample were subjected to a special heat treatment which allowed the formation of a certain nanostructure that affects the hysteresis properties of the material and allows to achieve a highly coercive state. The critical operating temperatures of the alloy were determined according to magnetic measurements at different temperatures performed on a vibrating magnetometer. It was found that thermal cycling of the sample in the range from 22°C to 400°C does not lead to changes in its magnetic properties at room temperatures. The investigations of magnetic viscosity effects allow us to conclude that the relaxation processes in the Gd-Zr-Co-Cu-Fe alloys are primarily due to the thermally activated overcoming of energy barriers by the domain walls, created by their complex and unique nanostructure. Metastable states of the domain structure near the barriers and their slow «release» under the influence of the thermal fluctuations result in the observed slow change in magnetization over time after a change in the external magnetic field and/or temperature.

Keywords: rare earth intermetallic compounds, hard magnetic materials, hysteresis, coercive force, magnetization, magnetization reversal processes, magnetic viscosity

  • Alexey Yu.. Karpenkov – Ph. D., Docent, Head of Condensed Matter Physics Department, Tver State University
  • Pavel A. Rakunov – 4rd year postgraduate student, Assistant, Condensed Matter Physic Department, Tver State University
  • Marina B. Lyakhova – Ph. D., Docent, Senior Researcher, Scientific Research Department, Tver State University
  • Elena M. Semenova – Ph. D., Docent, Condensed Matter Physics Department, Tver State University
  • Yuri G. Pastushenkov – D. Sc., Professor, Condensed Matter Physics Department, Tver State University

For citation:

Karpenkov A.Yu.., Rakunov P.A., Lyakhova M.B., Semenova E.M., Pastushenkov Yu..G. Osobennosti magnitnoj vyazkosti i protsessov peremagnichivaniya geterogennogo splava Gd0,85Zr0,15(Co0,7Cu0,09Fe0,21)6,0 [Magnetic viscosity and magnetic reversal processes of the heterogeneous Gd0,85Zr0,15(Co0,7Cu0,09Fe0,21)6,0 alloy], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 077-091. DOI: 10.26456/pcascnn/2025.17.077. ⎘

Full article (in Russian): download PDF file

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