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Spontaneous chiral symmetry breaking and lane formation in ferromagnetic ferrofluids
ID
Vilfan, Mojca
(
Author
),
ID
Lampret, Borut
(
Author
),
ID
Gregorin, Žiga
(
Author
),
ID
Cmok, Luka
(
Author
),
ID
Vilfan, Andrej
(
Author
),
ID
Klepp, Jürgen
(
Author
),
ID
Kohlbrecher, Joachim
(
Author
),
ID
Hribar Boštjančič, Patricija
(
Author
),
ID
Lisjak, Darja
(
Author
),
ID
Mertelj, Alenka
(
Author
)
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https://onlinelibrary.wiley.com/doi/10.1002/smll.202304387
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Abstract
Ferromagnetic ferrofluids are synthetic materials consisting of magnetic nanoplatelets dispersed in an isotropic fluid. Their main characteristics are the formation of stable magnetic domains and the presence of macroscopic magnetization even in the absence of a magnetic field. Here, the authors report on the experimental observation of spontaneous stripe formation in a ferromagnetic ferrofluid in the presence of an oscillating external magnetic field. The striped structure is identified as elongated magnetic domains, which exhibit reorientation upon reversal of the magnetic field. The stripes are oriented perpendicular to the magnetic field and are separated by alternating flow lanes. The velocity profile is measured using a space–time correlation technique that follows the motion of the thermally excited fluctuations in the sample. The highest velocities are found in the depleted regions between individual domains and reach values up to several µm s$^{−1}$. The fluid in adjacent lanes moves in the opposite directions despite the applied magnetic field being uniform. The formation of bidirectional flow lanes can be explained by alternating rotation of magnetic nanoparticles in neighboring stripes, which indicates spontaneous breaking of the chiral symmetry in the sample.
Language:
English
Keywords:
active matter
,
chiral symmetry breaking
,
ferrofluids
,
ferromagnetism
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FMF - Faculty of Mathematics and Physics
Publication status:
Published
Publication version:
Version of Record
Year:
2023
Number of pages:
11 str.
Numbering:
Vol. 19, iss. 52, art. 2304387
PID:
20.500.12556/RUL-153577
UDC:
537
ISSN on article:
1613-6829
DOI:
10.1002/smll.202304387
COBISS.SI-ID:
163350531
Publication date in RUL:
16.01.2024
Views:
597
Downloads:
27
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Title:
Small
Shortened title:
Small
Publisher:
Wiley
ISSN:
1613-6829
COBISS.SI-ID:
512826905
Licences
License:
CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
Link:
http://creativecommons.org/licenses/by-nc/4.0/
Description:
A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.
Secondary language
Language:
Slovenian
Keywords:
ferofluidi
,
feromagnetizem
,
zlomi
,
kiralne simetrije
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0192
Name:
Svetloba in snov
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0089
Name:
Sodobni magnetni in večnamenski materiali
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0099
Name:
Fizika mehkih snovi, površin in nanostruktur
Funder:
ARRS - Slovenian Research Agency
Project number:
J1-2459
Name:
Tekoči magneti: temeljne raziskave feromagnetnega urejanja v tekočinah
Funder:
ARRS - Slovenian Research Agency
Project number:
BI-AT/20-21-020
Funder:
Other - Other funder or multiple funders
Funding programme:
OEAD, WTZ
Project number:
SI 23/2020
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