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Search for the Magnetic Monopole at a Magnetoelectric Surface

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posted on 29.01.2019, 12:19 by Q.N. Meier, M. Fechner, T. Nozaki, M. Sahashi, Z. Salman, T. Prokscha, A. Suter, P. Schoenherr, M. Lilienblum, Pavel BorisovPavel Borisov, I.E. Dzyaloshinskii, M. Fiebig, H. Luetkens, N.A. Spaldin
We show, by solving Maxwell’s equations, that an electric charge on the surface of a slab of a linear magnetoelectric material generates an image magnetic monopole below the surface provided that the magnetoelectric has a diagonal component in its magnetoelectric response. The image monopole, in turn, generates an ideal monopolar magnetic field outside of the slab. Using realistic values of the electric and magnetic field susceptibilities, we calculate the magnitude of the effect for the prototypical magnetoelectric material Cr2O3. We use low-energy muon spin rotation to measure the strength of the magnetic field generated by charged muons as a function of their distance from the surface of a Cr2O3 film and show that the results are consistent with the existence of the monopole. We discuss other possible routes to detecting the monopolar field, and show that, while the predicted monopolar field generated by Cr2O3 is above the detection limit for standard magnetic force microscopy, the detection of the field using this technique is prevented by surface charging effects.

History

School

  • Science

Department

  • Physics

Published in

Physical Review X

Volume

9

Issue

1

Citation

MEIER, Q.N. ... et al, 2019. Search for the magnetic monopole at a magnetoelectric surface. Physical Review X, 9 (1), 011011.

Publisher

American Physical Society (APS)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

22/11/2018

Publication date

2019-01-18

Notes

This is an Open Access Article. It is published by the American Physical Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

2160-3308

eISSN

2160-3308

Language

en

Article number

011011

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