Slow magnetic dynamics and hysteresis loops of the bulk ferromagnet Co7(TeO3)4Br6

Prester, Mladen and Živković, Ivica and Drobac, Đuro and Šurija, Vinko and Pajić, Damir and Berger, Helmut (2011) Slow magnetic dynamics and hysteresis loops of the bulk ferromagnet Co7(TeO3)4Br6. Physical Review B, 84 (6). pp. 64441-1. ISSN 1098-0121

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Abstract

Magnetic dynamics of a bulk ferromagnet, a new single crystalline compound Co7(TeO3)4Br6, was studied by ac susceptibility and related techniques. Very large Arrhenius activation energy of 17.2 meV (201 K) and long attempt time (2 × 10−4 s) span the full spectrum of magnetic dynamics inside a convenient frequency window, offering a rare opportunity for general studies of magnetic dynamics. Within the experimental window, the ac susceptibility data build almost ideally semicircular Cole-Cole plots. A comprehensive study of experimental dynamic hysteresis loops of the compound is presented and interpretedwithin a simple thermal-activation-assisted spin-lattice relaxation model for spin reversal. Quantitative agreement between the experimental results and the model’s prediction for dynamic coercive field is achieved by assuming the central physical quantity, the Debye relaxation rate, to depend on frequency, as well as on the applied field strength and sample temperature. Crossover between minor to major hysteresis loops is carefully analyzed. Low-frequency limitations of the model, relying on domain-wall pinning effects, are experimentally detected and appropriately discussed.

Item Type: Article
Keywords: magnetic domains, dynamics of magnetic domains
Date: August 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 035-0352843-2845, 119-1191458-1017
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 17 May 2014 12:24
Last Modified: 24 Feb 2016 15:07
URI: http://digre.pmf.unizg.hr/id/eprint/1421

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