278 research outputs found
New type of stable particle like states in chiral magnets (Chiral bobbers)
We present a new type of a thermodynamically stable magnetic state at
interfaces and surfaces of chiral magnets. The state is a soliton solution of
micromagnetic equations localized in all three dimensions near a boundary and
contains a singularity, but nevertheless has a finite energy. Both features
combine to a quasi-particle state for which we expect unusual transport and
dynamical properties. It exhibits high thermal stability and thereby can be
considered as promising object for fundamental research and practical
applications in spintronic devices. We provide arguments that such a state can
be found in different B20-type alloys e.g. MnFeGe,
MnFeSi, FeCoSi.Comment: accepted in PR
2-(4-Methoxyphenyl)-4H-1,3,2-benzoxathiaphosphinine 2-sulfide
The asymmetric unit of the title compound, C14H13O2PS2, contains two crystallographically independent molecules, which differ in the conformation of the 1,3,2-benzoxathiaphosphinine moieties (screw boat in the first molecule and envelope in the second molecule). In the crystal, neither classical nor non-classical hydrogen bonds are found. Weak interactions (about 2.9–3.0 Å) between the lone pair of the terminal S atoms with H atoms occur. This compound was further characterized by 1H NMR and IR spectroscopy
Dynamical Toroidal Hopfions in a Ferromagnet with Easy-Axis Anisotropy
Three-dimensional toroidal precession solitons with a nonzero Hopf index,
which uniformly move along the anisotropy axis in a uniaxial ferromagnet, have
been found. The structure and existence region of the solitons have been
numerically determined by solving the Landau-Lifshitz equation.Comment: 6 pages, 4 figure
2-[2-(1H-Imidazol-1-yl)-2-adamantyl]phenol
In the title molecule, C19H22N2O, the imidazole and benzene rings form a dihedral angle of 84.53 (5)°. In the crystal, classical intermolecular O—H⋯N hydrogen bonds pair the molecules into centrosymmetric dimers, and C—H⋯π interactions further link these dimers into columns propagated in [100]
Exact Self-consistent Particle-like Solutions to the Equations of Nonlinear Scalar Electrodynamics in General Relativity
Exact self-consistent particle-like solutions with spherical and/or
cylindrical symmetry to the equations governing the interacting system of
scalar, electromagnetic and gravitational fields have been obtained. As a
particular case it is shown that the equations of motion admit a special kind
of solutions with sharp boundary known as droplets. For these solutions, the
physical fields vanish and the space-time is flat outside of the critical
sphere or cylinder. Therefore, the mass and the electric charge of these
configurations are zero.Comment: 17 pages, Submitted to the International Journal of Theoretical
Physic
2-(2-Methoxyphenyl)-4,4-dimethyl-4,5-dihydro-1,3-oxazole
In the title molecule, C12H15NO2, the oxazole ring adopts an envelope conformation. Overall, the molecule is approximately planar, the dihedral angle between the mean plane through all but the methylene C atom of the five-membered ring and the aromatic ring being 8.6 (1)°. A weak C—H⋯O interaction contributes to the stabilization of the crystal structure
Interaction of Individual Skyrmions in Nanostructured Cubic Chiral Magnet
We report the direct evidence of field-dependent character of the interaction
between individual magnetic skyrmions as well as between skyrmions and edges in
B20-type FeGe nanostripes observed by means of high resolution Lorentz
transmission electron microscopy. It is shown that above certain critical
values of external magnetic field the character of such long-range skyrmion
interactions change from attraction to repulsion. Experimentally measured
equilibrium inter-skyrmion and skrymion-edge distances as function of applied
magnetic field shows quantitative agreement with the results of micromagnetic
simulations. Important role of demagnetizing fields and internal symmetry of
three-dimensional magnetic skyrmions are discussed in details.Comment: accepted in PR
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