Domain structure in centroantisymmetric antiferromagnets

Khalfina, A. A.; Kharrasov, M. Kh.; Шамсутдинов, М. А.

doi:10.1134/1.1395098

Cited by 2 publications

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“…The system of Euler -Lagrange equations determining possible incommensurate phases for the field H OX is written in a form In the absence of the magnetic field the only plane cycloid Cy -state is realized. Numerical analysis of equations (33) shows that cone cycloids CC + , CC − differing by the direction of spin rotation appear when magnetic field is applied. For example the spatial dependences of vector l projections in the CC + -state are presented in Fig.…”

Section: A Homogeneous Magnetic Statesmentioning

confidence: 99%

“…The theoretical description of incommensurate superstructures in ferromagnetic metals has been elaborated by Dzyaloshinskii 30 . Within the same approach the cycloidal magnetic ordering in the BF O has been explained appealing to the mechanism of inhomogeneous magnetoelectric interactions [30][31][32][33][34][35] . The spin cycloid at room temperatures is well described by harmonic functions sin(kr), cos(kr), where k is the wave vector of spin propagation.…”

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Field-induced phase transitions and phase diagrams in BiFeO3-like multiferroics

et al. 2013

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The incommensurate magnetic structures and phase diagrams of multiferroics has been explored on the basis of accurate micromagnetic analysis taking into account the spin flexoelecric interaction (Lifshitz invariant). The objects of the study are BiF eO3 -like single crystals and epitaxial films grown on the < 111 > substrates. The main control parameters are the magnetic field, the magnetic anisotropy, and the epitaxial strain in the case of films. We predict novel quasi -cycloidal structures induced by external magnetic field or by epitaxial strain in the BiF eO3 -films. Phase diagrams representing the regions of homogeneous magnetic states and incommensurate structures stability are constructed for the two essential geometries of magnetic field (magnetic field oriented parallel to the principal crystal axis H C3 and perpendicular to this direction H⊥C3). It is shown that the direction of applied magnetic field substantially affects a set of magnetic phases, properties of incommensurate structures, character of phase transitions. Novel conical type of cycloidal ordering is revealed during the transition from incommensurate cycloidal structure into homogeneous magnetic state. Elaborated phase diagrams allow estimate appropriate combination of control parameters (magnetic field, magnetic anisotropy, exchange stiffness) required to the destruction of cycloidal ordering corresponding to the transition into homogeneous structure. The results show that the magnitude of critical magnetic field suppressing cycloid is lowered in multiferroics films comparing to single crystals, it can be also lowered by the selection of orientation of magnetic field. Our results can be useful for strain engineering of new multiferroic functional materials on demand.

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Section: A Homogeneous Magnetic Statesmentioning

confidence: 99%

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confidence: 99%