Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101518
Title: Coupled quasimonopoles in chiral magnets
Authors: Müller, G. P.
Rybakov, F. N.
Jónsson, H.
Blügel, S.
Kiselev, N. S.
Issue Date: 2020
Publisher: American Physical Society
Citation: Coupled quasimonopoles in chiral magnets / G. P. Müller, F. N. Rybakov, H. Jónsson, et al. — DOI 10.1103/PhysRevB.101.184405 // Physical Review B. — 2020. — Vol. 101. — Iss. 18. — 184405.
Abstract: 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. © 2020 American Physical Society.
Keywords: INTELLIGENT SYSTEMS
MONTE CARLO METHODS
PHASE TRANSITIONS
THERMODYNAMIC STABILITY
CHARACTERISTIC SIZE
CHIRAL MAGNETS
CONFINED SYSTEMS
ELEVATED TEMPERATURE
MAGNETIC MONOPOLES
NANOMAGNETISMS
PARAMAGNETIC PHASE TRANSITIONS
SPONTANEOUS NUCLEATION
MAGNETS
URI: http://hdl.handle.net/10995/101518
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85085648424
PURE ID: 12917139
4864a1c9-6035-4368-bf2b-226b759e6586
ISSN: 24699950
DOI: 10.1103/PhysRevB.101.184405
metadata.dc.description.sponsorship: We thank I. Maccari, D. Weston, and E. Babaev for discussions. G.P.M. and H.J. acknowledge funding from the Icelandic Research Fund (Grant No. 185405-051). The work of F.N.R. was supported by Swedish Research Council Grants No. 642-2013-7837, No. 2016-06122, and No. 2018-03659; by the Göran Gustafsson Foundation for Research in Natural Sciences and Medicine; and by Olle Engkvists Stiftelse. S.B. acknowledges funding from Deutsche Forschungsgemeinschaft (DFG) through SPP 2137 “Skyrmionics” Grant No. BL 444/16-1, the Collaborative Research Center SFB 1238 (Project No. C01), and the DARPA TEE program through MIPR Grant No. HR0011831554 from DOI. The work of N.S.K. was supported by Deutsche Forschungsgemeinschaft (DFG) via SPP 2137 “Skyrmionics” Grant No. KI 2078/1-1.
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