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Do images of biskyrmions show type-II bubbles?

Do images of biskyrmions show type-II bubbles?
Do images of biskyrmions show type-II bubbles?

The intense research effort investigating magnetic skyrmions and their applications for spintronics has yielded reports of more exotic objects including the biskyrmion, which consists of a bound pair of counter-rotating vortices of magnetization. Biskyrmions have been identified only from transmission electron microscopy images and have not been observed by other techniques, nor seen in simulations carried out under realistic conditions. Here, quantitative Lorentz transmission electron microscopy, X-ray holography, and micromagnetic simulations are combined to search for biskyrmions in MnNiGa, a material in which they have been reported. Only type-I and type-II magnetic bubbles are found and images purported to show biskyrmions can be explained as type-II bubbles viewed at an angle to their axes. It is not the magnetization but the magnetic flux density resulting from this object that forms the counter-rotating vortices.

biskyrmions, Lorentz transmission electron microscopy, magnetic bubbles, skyrmions, X-ray holography
0935-9648
Loudon, James C.
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Twitchett-Harrison, Alison C.
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Cortés-Ortuño, David
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Birch, Max T.
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Turnbull, Luke A.
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Štefančič, Aleš
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Ogrin, Feodor Y.
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Burgos-Parra, Erick O.
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Bukin, Nicholas
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Laurenson, Angus
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Popescu, Horia
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Beg, Marijan
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Hovorka, Ondrej
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Fangohr, Hans
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Midgley, Paul A.
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Balakrishnan, Geetha
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Hatton, Peter D.
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Loudon, James C.
315df0a8-a208-476c-9d53-b16e32379a6d
Twitchett-Harrison, Alison C.
cd305af8-6fbc-404c-95e1-ae72fdefa745
Cortés-Ortuño, David
97d026d6-1083-4edf-8ba6-2f66a3e15033
Birch, Max T.
35834fe2-4902-48d0-bc9e-cd6ddb078aa8
Turnbull, Luke A.
435ead56-d6bc-4bba-b042-4169624e45eb
Štefančič, Aleš
2c35db00-8d8d-4e23-a306-ac6f8b388224
Ogrin, Feodor Y.
15430e3f-7637-4567-ade2-3a3da32d4e0c
Burgos-Parra, Erick O.
e39e48ac-0ae2-4c24-923a-35c6ddbb91c4
Bukin, Nicholas
b8ab5324-8cf2-4199-bdec-7e418f49eedc
Laurenson, Angus
cf705ccd-a1c6-40ff-b261-29bf3fbc46b9
Popescu, Horia
60aea6d0-7166-453b-94fb-f249b9d3d606
Beg, Marijan
5c7cc1ff-f244-471f-b964-9f24e0628153
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Midgley, Paul A.
ead492aa-20da-404d-b7bd-1a0f9a21252a
Balakrishnan, Geetha
6eb4be9f-2337-4319-ac87-805db3132076
Hatton, Peter D.
05ef72bb-d5a7-4838-9464-209913a75f68

Loudon, James C., Twitchett-Harrison, Alison C., Cortés-Ortuño, David, Birch, Max T., Turnbull, Luke A., Štefančič, Aleš, Ogrin, Feodor Y., Burgos-Parra, Erick O., Bukin, Nicholas, Laurenson, Angus, Popescu, Horia, Beg, Marijan, Hovorka, Ondrej, Fangohr, Hans, Midgley, Paul A., Balakrishnan, Geetha and Hatton, Peter D. (2019) Do images of biskyrmions show type-II bubbles? Advanced Materials. (doi:10.1002/adma.201806598).

Record type: Article

Abstract

The intense research effort investigating magnetic skyrmions and their applications for spintronics has yielded reports of more exotic objects including the biskyrmion, which consists of a bound pair of counter-rotating vortices of magnetization. Biskyrmions have been identified only from transmission electron microscopy images and have not been observed by other techniques, nor seen in simulations carried out under realistic conditions. Here, quantitative Lorentz transmission electron microscopy, X-ray holography, and micromagnetic simulations are combined to search for biskyrmions in MnNiGa, a material in which they have been reported. Only type-I and type-II magnetic bubbles are found and images purported to show biskyrmions can be explained as type-II bubbles viewed at an angle to their axes. It is not the magnetization but the magnetic flux density resulting from this object that forms the counter-rotating vortices.

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Accepted/In Press date: 1 January 2019
e-pub ahead of print date: 7 March 2019
Keywords: biskyrmions, Lorentz transmission electron microscopy, magnetic bubbles, skyrmions, X-ray holography

Identifiers

Local EPrints ID: 429605
URI: https://eprints.soton.ac.uk/id/eprint/429605
ISSN: 0935-9648
PURE UUID: 8762ae17-f54c-4066-b8cd-033da0df3987
ORCID for David Cortés-Ortuño: ORCID iD orcid.org/0000-0003-3799-3141
ORCID for Marijan Beg: ORCID iD orcid.org/0000-0002-6670-3994

Catalogue record

Date deposited: 01 Apr 2019 16:30
Last modified: 18 May 2019 00:30

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Contributors

Author: James C. Loudon
Author: Alison C. Twitchett-Harrison
Author: David Cortés-Ortuño ORCID iD
Author: Max T. Birch
Author: Luke A. Turnbull
Author: Aleš Štefančič
Author: Feodor Y. Ogrin
Author: Erick O. Burgos-Parra
Author: Nicholas Bukin
Author: Angus Laurenson
Author: Horia Popescu
Author: Marijan Beg ORCID iD
Author: Ondrej Hovorka
Author: Hans Fangohr
Author: Paul A. Midgley
Author: Geetha Balakrishnan
Author: Peter D. Hatton

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