Magnetic phase diagrams in the H-T plane of the magnetically strongest sigma-phase Fe-V compounds

Magnetization measurements were performed on two sigma-phase samples of Fe100−xVx (x=35.5, 34.1) vs. temperature, T, and in DC magnetic field, of various amplitudes. Using three characteristic temperatures, magnetic phase diagrams in the H-T plane have been designed testifying to a re-entrant charac...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-04, Vol.428, p.154-157
Main Authors: Sikora, M., Dubiel, S.M.
Format: Article
Language:English
Subjects:
Chemical elements
Fe-V alloys
H-T phase diagram
Magnetic fields
Magnetism
Phase diagrams
Phase transitions
Re-entrant magnetism
Sigma phase
Spin glasses
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Summary:Magnetization measurements were performed on two sigma-phase samples of Fe100−xVx (x=35.5, 34.1) vs. temperature, T, and in DC magnetic field, of various amplitudes. Using three characteristic temperatures, magnetic phase diagrams in the H-T plane have been designed testifying to a re-entrant character of magnetism. The ground magnetic state, a spin glass (SG), was evidenced to be composed of two sub phases: one with a weak irreversibility and the other with a strong irreversibility. Two critical lines were reconstructed within the SG state. Both of them show a crossover from the Gabay-Toulouse behavior (low field) to a linear and/or quasi-Almeida-Touless behavior. A strong difference in the effect of the applied magnetic field on the SG phase in the two samples was revealed. [Display omitted] •Re-entrant magnetic properties of sigma-phase Fe-V alloys has been found.•Magnetic phase diagrams in the H-T plane have been outlined.•Cross-over behavior of critical lines was revealed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2016.11.117