Study of the magnetic viscosity of amorphous Fe-Zr alloys in the spin-glass state

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Abstract

Magnetic viscosity was measured for amorphous Fe100-xZrx (7 ≤ x ≤ 12) alloys in the spin-glass state as a function of magnetic field (0 <H <500 Oe) and temperature (4.2 <T <60 K). The viscosity field, Hv, deduced from these measurements is independent of H and decreases with increasing temperature as (1/T)2.0±0.3 for all the alloys. The activation volume, Va, calculated from Hv varies with the temperature as T3.0±0.3. The reduced coercivity, hc = Hc/2πMs (Hc being the coercivity and Ms the saturation magnetization) as a function of Da, the characteristic size calculated from the activation volume, falls approximately to a common curve for all the alloys. This dependence decreases with increasing Da as (1/Da)2.0±0.2. Such a size dependence of the coercivity hints at a curling-type nucleation mechanism of domains in the spin-glass state of the amorphous Fe-rich Fe-Zr alloys.

Original languageEnglish
Pages (from-to)10501-10508
Number of pages8
JournalJournal of Physics Condensed Matter
Volume9
Issue number47
DOIs
Publication statusPublished - Nov 24 1997

Fingerprint

Magnetic after effect
Spin glass
spin glass
Coercive force
viscosity
coercivity
Chemical activation
activation
Saturation magnetization
Temperature
temperature
Nucleation
nucleation
Viscosity
Magnetic fields
saturation
magnetization
curves
magnetic fields

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Study of the magnetic viscosity of amorphous Fe-Zr alloys in the spin-glass state. / Kiss, L.; Kemény, T.; Vincze, I.

In: Journal of Physics Condensed Matter, Vol. 9, No. 47, 24.11.1997, p. 10501-10508.

Research output: Contribution to journalArticle

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N2 - Magnetic viscosity was measured for amorphous Fe100-xZrx (7 ≤ x ≤ 12) alloys in the spin-glass state as a function of magnetic field (0 <H <500 Oe) and temperature (4.2 <T <60 K). The viscosity field, Hv, deduced from these measurements is independent of H and decreases with increasing temperature as (1/T)2.0±0.3 for all the alloys. The activation volume, Va, calculated from Hv varies with the temperature as T3.0±0.3. The reduced coercivity, hc = Hc/2πMs (Hc being the coercivity and Ms the saturation magnetization) as a function of Da, the characteristic size calculated from the activation volume, falls approximately to a common curve for all the alloys. This dependence decreases with increasing Da as (1/Da)2.0±0.2. Such a size dependence of the coercivity hints at a curling-type nucleation mechanism of domains in the spin-glass state of the amorphous Fe-rich Fe-Zr alloys.

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