Spatial resonance in ferromagnetics

•Combined effect of the severe plastic deformation by twisting and temporarily-constant space-varied pressure in a ferromagnetic crystal is studied.•The behavior of the moduli of magnetic and structural order parameters is considered.•The analysis is carried out in different temperature ranges withi...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-11, Vol.442, p.391-396
Main Authors: Zavorotnev, Yu.D., Popova, O.Yu, Gumennyk, K.V.
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
Ferromagnetic
Ferromagnetism
Harmonics
Magnetic resonance
Magnetism
Order parameter
Order parameters
Phase transition
Phase transitions
Plastic deformation
Spatial oscillation
Stress concentration
Twist-induced severe plastic deformations
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Summary:•Combined effect of the severe plastic deformation by twisting and temporarily-constant space-varied pressure in a ferromagnetic crystal is studied.•The behavior of the moduli of magnetic and structural order parameters is considered.•The analysis is carried out in different temperature ranges within the frameworks of Landau phenomenological theory.•The magnetic and structural phase transitions can be of the first and second order.•The temperatures of the phase transitions are at a small distance.•Two types of the spatial resonance are possible. In the first case, the propagation vectors of the noise term and the applied temporarily-constant pressure coincide. In the second case, there exists the coincidence of the vectors of the fundamental oscillation of the structural order parameter and the constant pressure.•Governing of the distribution function of the changes in the moduli of the magnetic and the structural order parameters by means of the temperature and the applied pressure is possible. Phenomenological Landau theory is used to study an interaction between structural and magnetic subsystems in a crystal in the vicinity of phase-transition lines. It is demonstrated that the twist-induced severe plastic deformation results in a forced onset of inhomogeneous distribution in the magnetic subsystem. A nonsinusoidal spatial modulation of magnetic and structural order parameter moduli is found to arise near the lines of magnetic or structural phase transition. The obtained results permit to construct various distributions of ferromagnetic vector in crystals under twist-induced severe plastic deformation.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.06.133