This title appears in the Scientific Report : 2020 

Coupled quasimonopoles in chiral magnets
Müller, Gideon (Corresponding author)
Rybakov, Filipp N. / Jónsson, Hannes / Blügel, Stefan / Kiselev, Nikolai (Corresponding author)
Quanten-Theorie der Materialien; IAS-1
JARA - HPC; JARA-HPC
JARA-FIT; JARA-FIT
Quanten-Theorie der Materialien; PGI-1
Physical review / B covering condensed matter and materials physics, 101 (2020) 18, S. 184405
Woodbury, NY Inst. 2020
10.1103/PhysRevB.101.184405
Journal Article
Controlling Configuration-Based Phenomena
Controlling Spin-Based Phenomena
OpenAccess
OpenAccess
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.101.184405 in citations.
Please use the identifier: http://hdl.handle.net/2128/25057 in citations.
Magnetic singularities, also known as magnetic monopoles or Bloch points, represent intriguing phenomena in nanomagnetism. We show that a pair of coupled Bloch points—a dipole string—may appear as a stable state in cubic chiral magnets. Analysis of the thermodynamic stability of such objects in the interior of crystals and in geometrically confined systems is presented. Employing advanced Monte Carlo simulations, we reveal an effect of spontaneous nucleation of dipole strings with characteristic size on the order of the helix pitch at temperature close to the paramagnetic phase transition. Such behavior of chiral magnets at elevated temperature drastically distinguishes them from ordinary ferromagnets and may provide a significant contribution to the topological Hall effect even in the absence of skyrmions.