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pro vyhledávání: '"Kireev, V. E."'
Akademický článek
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Publikováno v:
Phys. Rev. B 87, 184404 (2013)
We show that a magnetic vortex is the ground state of an array of magnetic particles shaped as a hexagonal fragment of a triangular lattice, even for an small number of particles in the array $N \leq 100$. The vortex core appears and the symmetry of
Externí odkaz:
http://arxiv.org/abs/1301.4245
We analyzed the ground state of the array of magnetic particles (magnetic dots) which form a two-dimensional triangular lattice, and magnetic moment of which is perpendicular to the plane of the lattice, in the presence of external magnetic field. In
Externí odkaz:
http://arxiv.org/abs/1201.1747
Autor:
Ivanov, B. A., Kireev, V. E.
Publikováno v:
JETP Letters, Vol. 81, No 7, 2005, pp. 321 -- 325
Quantum (step-like) magnetization curves are studies for a spin pair with antiferromagnetic coupling in the presence of a magnetic field parallel to the easy axis of the magnetic anisotropy. The consideration is done both analytically and numerically
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505188
Autor:
Ivanov, B. A., Kireev, V. E.
Publikováno v:
JETP 94, 270 -- 282 (2002)
For a two-sublattice antiferromagnet the Lagrangian is constructed taking into account Berry phase whose form is matched to the quantum-mechanical Heisenberg Hamiltonian. Tunnel effects are analyzed taking into account the crystallographic symmetry a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0501185
Autor:
Ivanov, B. A., Kireev, V. E.
Publikováno v:
Phys. Rev. B 70, 214430 (2004)
We consider an effect of a strong magnetic field on the ground state and macroscopic coherent tunneling in small antiferromagnetic particles with uniaxial and biaxial single-ion anisotropy. We find several tunneling regimes that depend on the directi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404069
Autor:
Kireev, V. E., Ivanov, B. A.
We investigate analytically and numerically the ground and metastable states for easy-plane Heisenberg magnets with single-ion surface anisotropy and disk geometry. The configurations with two half-vortices at the opposite points of the border are sh
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211265
Publikováno v:
Phys. Rev. B v.58, 11514 (1998)
We consider a domain wall in the mesoscopic quasi-one-dimensional sample (wire or stripe) of weakly anisotropic two-sublattice antiferromagnet, and estimate the probability of tunneling between two domain wall states with different chirality. Topolog
Externí odkaz:
http://arxiv.org/abs/cond-mat/9803018
Akademický článek
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Publikováno v:
Ukrainian Journal of Physics; Vol. 65 No. 10 (2020); 924
Український фізичний журнал; Том 65 № 10 (2020); 924
Український фізичний журнал; Том 65 № 10 (2020); 924
The spin dynamics in antiferromagnets with atomic dislocations and dislocation-induced spin disclinations has been discussed. It is shown how the usual sigma-model equation can be used to describe it. The dynamical states with the spatially inhomogen