Coupled quasimonopoles in chiral magnets

Gideon P. Müller, Filipp N. Rybakov, Hannes Jónsson, Stefan Blügel, Nikolai S. Kiselev

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Article number184405
JournalPhysical Review B
Volume101
Issue number18
DOIs
Publication statusPublished - 1 May 2020

Bibliographical note

Funding Information:
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.

Publisher Copyright:
© 2020 American Physical Society.

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