Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Nattermann, Thomas"'
Publikováno v:
Phys. Rev. B 98, 014436 (2018)
An asymptotically exact theory of spectrum and transverse distribution of magnetization in long-wave magnons is presented. It is based on exact analytical solution of linearized Landau-Lifshitz equation in a film. The quantization of the transverse w
Externí odkaz:
http://arxiv.org/abs/1710.05362
Autor:
Nattermann, Thomas
Publikováno v:
Europhysics Letters, 105, 27004 (2014)
Recently completely new types of domain walls (DWs) have been discovered in helical magnets, consisting generically of a regular array of {\it pairs} of magnetic vortex lines \cite{Li+12}. Only for special orientations DWs are free of vortices. In th
Externí odkaz:
http://arxiv.org/abs/1210.1358
Autor:
Roostaei, Bahman, Nattermann, Thomas
The theory of elasticity and pinning of domain walls in helical magnets is presented. Domain walls perpendicular to the helical axis show non-local elasticity and are marginally pinned by local disorder. Weak anisotropy combined with magnetic dilutio
Externí odkaz:
http://arxiv.org/abs/1204.4678
Publikováno v:
Phys. Rev. Lett. 108 107203 (2012)
The structure of domain walls determines to a large extent the properties of magnetic materials, in particular their hardness and switching behavior, it represents an essential ingredient of spintronics. Common domain walls are of Bloch and Neel type
Externí odkaz:
http://arxiv.org/abs/1107.5753
Autor:
Schütze, Friedmar, Nattermann, Thomas
We study the mean field equation of motion for driven domain walls in random media. We discuss the two cases of an external constant as well as an oscillating driving force. Our main focus lies on the critical dynamics close to the depinning transiti
Externí odkaz:
http://arxiv.org/abs/1012.0667
Publikováno v:
Phys. Rev. B 80, 212504 (2009)
We investigate the influence of quantum fluctuations and weak disorder on the vortex dynamics in a two-dimensional superconducting Berezinskii-Kosterlitz-Thouless system. The temperature below which quantum fluctuations dominate the vortex creep is d
Externí odkaz:
http://arxiv.org/abs/0910.2651
Publikováno v:
Phys. Rev. Lett. 104, 076401 (2010)
We consider theoretically transport in a spinfull one-channel interacting quantum wire placed in an external magnetic field. For the case of two point-like impurities embedded in the wire, under a small voltage bias the spin-polarized current occurs
Externí odkaz:
http://arxiv.org/abs/0909.0025
Publikováno v:
Phys. Rev B 80, 195102 (2009)
We consider theoretically the transport in a one-channel spinless Luttinger liquid with two strong impurities in the presence of dissipation. As a difference with respect to the dissipation free case, where the two impurities fully transmit electrons
Externí odkaz:
http://arxiv.org/abs/0906.3995
Publikováno v:
Phys. Rev. B 79, 224512 (2009)
The influence of randomly distributed point impurities and planar defects on order and transport in type-II superconductors and related systems is studied. It is shown that the Bragg glass phase is unstable with respect to planar efects. Even a singl
Externí odkaz:
http://arxiv.org/abs/0903.5530
Publikováno v:
Phys. Rev. Lett. 101, 267005 (2008)
The influence of randomly distributed point impurities \emph{and} planar defects on the order and transport in type-II superconductors and related systems is considered theoretically. For planar defects of identical orientation the flux line lattice
Externí odkaz:
http://arxiv.org/abs/0805.2103