Zobrazeno 1 - 10
of 509
pro vyhledávání: '"Robbins, JM"'
Publikováno v:
Phys. Rev. B 101, 020418 (2020)
We report the existence of a new regime for domain wall motion in uniaxial and near-uniaxial ferromagnetic nanowires, characterised by applied magnetic fields sufficiently strong that one of the domains becomes unstable. There appears a new stable so
Externí odkaz:
http://arxiv.org/abs/1902.04968
Autor:
Gat, Omri, Robbins, JM
We classify the topology of bands defined by the energy states of quantum systems with scale separation between slow and fast degrees of freedom, invariant under fermionic time reversal. Classical phase space transforms differently from momentum spac
Externí odkaz:
http://arxiv.org/abs/1511.08994
We investigate prototypical profiles of point defects in two dimensional liquid crystals within the framework of Landau-de Gennes theory. Using boundary conditions characteristic of defects of index $k/2$, we find a critical point of the Landau-de Ge
Externí odkaz:
http://arxiv.org/abs/1403.2566
Publikováno v:
EPL (Europhys. Lett.) 105, 67006 (2014)
Dynamics of magnetization domain walls (DWs) in thin ferromagnetic nanotubes subject to longitudinal external fields is addressed analytically in the regimes of strong and weak penalization. Explicit functional forms of the DW profiles and formulas f
Externí odkaz:
http://arxiv.org/abs/1310.6883
Publikováno v:
Proc. R. Soc. A 469, 20130308 (2013)
We develop a systematic asymptotic description for domain wall motion in one-dimensional magnetic nanowires under the influence of small applied magnetic fields and currents and small material anisotropy. The magnetization dynamics, as governed by th
Externí odkaz:
http://arxiv.org/abs/1310.4442
Publikováno v:
Phys. Rev. B 84, 104445 (2011)
We show that recently reported precessing solution of Landau-Lifshitz-Gilbert equations in ferromagnetic nanowires is stable under small perturbations of initial data, applied field and anisotropy constant. Linear stability is established analyticall
Externí odkaz:
http://arxiv.org/abs/1106.5808
Publikováno v:
Published online 21 July 2010 in Proc. Roy. Soc A
Quantum graphs are commonly used as models of complex quantum systems, for example molecules, networks of wires, and states of condensed matter. We consider quantum statistics for indistinguishable spinless particles on a graph, concentrating on the
Externí odkaz:
http://arxiv.org/abs/1101.1535
Publikováno v:
Phys. Rev. Lett. 104, 147202 (2010)
We address the dynamics of magnetic domain walls in ferromagnetic nanowires under the influence of external time-dependent magnetic fields. We report a new exact spatiotemporal solution of the Landau-Lifshitz-Gilbert equation for the case of soft fer
Externí odkaz:
http://arxiv.org/abs/1002.2913
Unit-vector fields $\nvec$ on a convex polyhedron $P$ subject to tangent boundary conditions provide a simple model of nematic liquid crystals in prototype bistable displays. The equilibrium and metastable configurations correspond to minimisers and
Externí odkaz:
http://arxiv.org/abs/0905.1585
Publikováno v:
Annales Henri Poincare 25, 77 - 103 (2008)
A unit-vector field n:P \to S^2 on a convex polyhedron P \subset R^3 satisfies tangent boundary conditions if, on each face of P, n takes values tangent to that face. Tangent unit-vector fields are necessarily discontinuous at the vertices of P. We c
Externí odkaz:
http://arxiv.org/abs/math-ph/0606024