Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.109: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Skyrmion textures in cubic helimagnets with competing cubic and exchange anisotropies — •Filipp N. Rybakov1,2, Andrey A. Leonov1, Anna B. Butenko1, Alexei N. Bogdanov1, and Ulrich K. Rössler1 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2Institute of Metal Physics, UD of the RAS, 620990, Ekaterinburg, Russia
In non-centrosymmetric chiral magnets,
isotropic Dzyaloshinskii-Moriya interactions
destabilize the homogeneous magnetic structure
and induce long-range 1-dimensional (spirals)
and 2-dimensional (Skyrmions) chiral modulations of
the magnetization with sense of rotation
fixed by the sign of Dzyaloshinskii the constant D
and period by the twisting length, D/A
(A is the exchange stiffness) [1].
In this contribution we show
that small anisotropic
forces as cubic anisotropy and
anisotropic exchange determine
the propagation directions of spirals
and axes of Skyrmions along
certain crystal directions and
stabilize Skyrmion textures in
a broad range of magnetic fields.
The equilibrium parameters of Skyrmions,
helices, and cycloids are determined
as functions of a bias magnetic field
and the values of competing anisotropic
interactions.
The results demonstrate
that a plethora of different precursor phenomena,
modulated mesophases, and reorientation transitions
may arise in cubic helimagnets near magnetic
ordering depending on very weak magnetic couplings.
[1] U. K. Rößler et al., J. Phys.,
in press; arXiv:1009.4849v1 (2010);
A.B. Butenko et al., Phys. Rev. B 80, 134410 (2009).