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  4. Slow magnetic dynamics and hysteresis loops of the bulk ferromagnet Co-7(TeO3)(4)Br-6
 
research article

Slow magnetic dynamics and hysteresis loops of the bulk ferromagnet Co-7(TeO3)(4)Br-6

Prester, M.
•
Zivkovic, I.  
•
Drobac, D.
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2011
Physical Review B

Magnetic dynamics of a bulk ferromagnet, a new single crystalline compound Co-7(TeO3)(4)Br-6, was studied by ac susceptibility and related techniques. Very large Arrhenius activation energy of 17.2 meV (201 K) and long attempt time (2 x 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 interpreted within 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.

  • Details
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Type
research article
DOI
10.1103/PhysRevB.84.064441
Web of Science ID

WOS:000294401300009

Author(s)
Prester, M.
•
Zivkovic, I.  
•
Drobac, D.
•
Surija, V.
•
Pajic, D.
•
Berger, H.
Date Issued

2011

Published in
Physical Review B
Volume

84

Article Number

064441

Subjects

Time-Dependence

•

Ising-Model

•

Reversal

•

Fields

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ICMP  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73612
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