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- Robert Streubel, Dominic J Thurmer, +7 authors Oliver G Schmidt
- Nano letters
- 2012

Modifying the curvature in magnetic nanostructures is a novel and elegant way toward tailoring physical phenomena at the nanoscale, allowing one to overcome limitations apparent in planar counterparts. Here, we address curvature-driven changes of static magnetic properties in cylindrically curved magnetic segments with different radii of curvature. The… (More)

- Oleksandr V Pylypovskyi, Volodymyr P Kravchuk, Denis D Sheka, Denys Makarov, Oliver G Schmidt, Yuri Gaididei
- Physical review letters
- 2015

We show that the interaction of the magnetic subsystem of a curved magnet with the magnet curvature results in the coupling of a topologically nontrivial magnetization pattern and topology of the object. The mechanism of this coupling is explored and illustrated by an example of a ferromagnetic Möbius ring, where a topologically induced domain wall appears… (More)

- Yuri Gaididei, Volodymyr P Kravchuk, Denis D Sheka
- Physical review letters
- 2014

A magnetic energy functional is derived for an arbitrary curved thin shell on the assumption that the magnetostatic effects can be reduced to an effective easy-surface anisotropy; it can be used for solving both static and dynamic problems. General static solutions are obtained in the limit of a strong anisotropy of both signs (easy-surface and easy-normal… (More)

- Sang-Koog Kim, Myoung-Woo Yoo, +5 authors Denis D Sheka
- Scientific reports
- 2015

We found resonantly excited precession motions of a three-dimensional vortex core in soft magnetic nanospheres and controllable precession frequency with the sphere diameter 2R, as studied by micromagnetic numerical and analytical calculations. The precession angular frequency for an applied static field HDC is given as ωMV = γeffHDC, where γeff = γ〈mΓ〉 is… (More)

- Jean-Guy Caputo, Yuri Gaididei, Franz G Mertens, Denis D Sheka
- Physical review letters
- 2007

The spin-transfer effect is investigated for the vortex state of a magnetic nanodot. A spin current is shown to act similarly to an effective magnetic field perpendicular to the nanodot. Then a vortex with magnetization (polarity) parallel to the current polarization is energetically favorable. Following a simple energy analysis and using direct… (More)

- Sang-Koog Kim, Myoung-Woo Yoo, +5 authors Denis D. Sheka
- 2015

We found resonantly excited precession motions of a three-dimensional vortex core in soft magnetic nanospheres and controllable precession frequency with the sphere diameter 2R, as studied by micromagnetic numerical and analytical calculations. The precession angular frequency for an applied static field H DC is given as ω MV = γ eff H DC , where γ eff =… (More)

- Oleksandr V. Pylypovskyi, Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, Denys Makarov, Yuri Gaididei
- Scientific reports
- 2016

Manipulation of the domain wall propagation in magnetic wires is a key practical task for a number of devices including racetrack memory and magnetic logic. Recently, curvilinear effects emerged as an efficient mean to impact substantially the statics and dynamics of magnetic textures. Here, we demonstrate that the curvilinear form of the exchange… (More)

- Denis D. Sheka
- 2006

The standard relation between the field momentum and the force is generalized for the system with a field singularity: in addition to the regular force, there appears the singular one. This approach is applied to the description of the gyroscopic dynamics of the classical field with topological defects. The collective– variable Lagrangian description is… (More)

Dynamical topological solitons are studied in classical two–dimensional Heisenberg easy–axis ferromagnets. The properties of such solitons are treated both analytically in the continuum limit and numerically by spin dynamics simulations of the discrete system. Excitation of internal mode causes orbital motion. This is confirmed by simulations. Dynamics of… (More)

- B. A. IVANOV, D. D. SHEKA
- 1999

— The article reviews two–dimensional magnetic solitons in a classical weakly– anisotropic Heisenberg magnets. Topological classification, structure, dynamical properties and thermodynamical contribution of 2D solitons to response functions of the magnet are discussed. On the basis of taking in the paper effective equations of motion we calculated the… (More)