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- Title
Modulated Magnetic Structure of Weak Rhombohedral Ferromagnets α-Fe<sub>2</sub>O<sub>3</sub>:Ga and FeBO<sub>3</sub>:Mg.
- Authors
Sokolov, B. Yu.
- Abstract
The effect of diamagnetic impurities on the stability of the homogeneous magnetic state of rhombohedral antiferromagnets with weak ferromagnetism (α-Fe2O3:Ga and FeBO3:Mg) is studied experimentally. It is shown that the application of an external magnetic field in the basal plane in the crystals under study in a certain temperature range induces a magnetic superstructure along the hard magnetization axis, which can be presented in the form of a ripplon phase with the azimuth of the local ferromagnetism vector oscillating about the direction of the field. The preferred orientation of the discovered modulated structures relative to crystallographic directions in the basal plane of α-Fe2O3:Ga and FeBO3:Mg is studied, and the dependence of the spatial period of the superstructure on the applied magnetic field and temperature is analyzed. The magnetic-field-induced transition of the studied crystals from a homogeneous to an inhomogeneous magnetic state is described phenomenologically on the basis of the thermodynamic potential with gradient terms. In the discussion of physical reasons for magnetic order parameter modulation in weak ferromagnetic doped with diamagnetic ions, preference is given to the mechanism associated with the emergence of uniaxial magnetic centers with a random distribution of azimuths of easy axes in the basal plane of the crystal in the vicinity of impurities. A model describing the formation of a modulated magnetic state in α-Fe2O3:Ga and FeBO3:Mg is proposed, according to which the competition between magnetoanisotropic and Zeeman interactions in the inhomogeneous magnetic phase of these crystals leads to periodic deviations in the direction of the local ferromagnetism vector from the direction of magnetization.
- Subjects
FERROMAGNETISM; ELECTRIC properties of crystals; MAGNETIC fields; FERROMAGNETIC materials; MAGNETISM -- Experiments; FIELD theory (Physics); PHYSICS
- Publication
Journal of Experimental & Theoretical Physics, 2004, Vol 99, Issue 2, p417
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/1.1800199