Anisotropic magnetic particles in a magnetic field
Martchenko, Ilya LU ; Crassous, Jerome LU ; Mihut, Adriana M. LU ; Bialik, Erik LU ; Hirt, Ann M ; Rufier, Chantal ; Menzel, Andreas LU ; Dietsch, Hervé ; Linse, Per LU and Schurtenberger, Peter LU
(2016)
In Soft Matter
12(42).
p.8755-8767
- Abstract
We characterize the structural properties of magnetic ellipsoidal hematite colloids with an aspect ratio ρ ≈ 2.3 using a combination of small-angle X-ray scattering and computer simulations. The evolution of the phase diagram with packing fraction φ and the strength of an applied magnetic field B is described, and the coupling between orientational order of magnetic ellipsoids and the bulk magnetic behavior of their suspension addressed. We establish quantitative structural criteria for the different phase and arrest transitions and map distinct isotropic, polarized non-nematic, and nematic phases over an extended range in the φ-B coordinates. We show that upon a rotational arrest of the ellipsoids around φ = 0.59, the bulk magnetic... (More)
We characterize the structural properties of magnetic ellipsoidal hematite colloids with an aspect ratio ρ ≈ 2.3 using a combination of small-angle X-ray scattering and computer simulations. The evolution of the phase diagram with packing fraction φ and the strength of an applied magnetic field B is described, and the coupling between orientational order of magnetic ellipsoids and the bulk magnetic behavior of their suspension addressed. We establish quantitative structural criteria for the different phase and arrest transitions and map distinct isotropic, polarized non-nematic, and nematic phases over an extended range in the φ-B coordinates. We show that upon a rotational arrest of the ellipsoids around φ = 0.59, the bulk magnetic behavior of their suspension switches from superparamagnetic to ordered weakly ferromagnetic. If densely packed and arrested, these magnetic particles thus provide persisting remanent magnetization of the suspension. By exploring structural and magnetic properties together, we extend the often used colloid-atom analogy to the case of magnetic spins.
(Less)
- author
- Martchenko, Ilya
LU
; Crassous, Jerome
LU
; Mihut, Adriana M.
LU
; Bialik, Erik
LU
; Hirt, Ann M
; Rufier, Chantal
; Menzel, Andreas
LU
; Dietsch, Hervé
; Linse, Per
LU
and Schurtenberger, Peter
LU
- organization
- publishing date
- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 12
- issue
- 42
- pages
- 13 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:27722439
- wos:000386966900013
- scopus:84993985710
- ISSN
- 1744-683X
- DOI
- 10.1039/c6sm01411a
- language
- English
- LU publication?
- yes
- id
- e2373e21-042f-4489-9056-540a7a9ca775
- date added to LUP
- 2017-02-23 13:55:59
- date last changed
- 2024-01-13 15:13:44
@article{e2373e21-042f-4489-9056-540a7a9ca775,
abstract = {{<p>We characterize the structural properties of magnetic ellipsoidal hematite colloids with an aspect ratio ρ ≈ 2.3 using a combination of small-angle X-ray scattering and computer simulations. The evolution of the phase diagram with packing fraction φ and the strength of an applied magnetic field B is described, and the coupling between orientational order of magnetic ellipsoids and the bulk magnetic behavior of their suspension addressed. We establish quantitative structural criteria for the different phase and arrest transitions and map distinct isotropic, polarized non-nematic, and nematic phases over an extended range in the φ-B coordinates. We show that upon a rotational arrest of the ellipsoids around φ = 0.59, the bulk magnetic behavior of their suspension switches from superparamagnetic to ordered weakly ferromagnetic. If densely packed and arrested, these magnetic particles thus provide persisting remanent magnetization of the suspension. By exploring structural and magnetic properties together, we extend the often used colloid-atom analogy to the case of magnetic spins.</p>}},
author = {{Martchenko, Ilya and Crassous, Jerome and Mihut, Adriana M. and Bialik, Erik and Hirt, Ann M and Rufier, Chantal and Menzel, Andreas and Dietsch, Hervé and Linse, Per and Schurtenberger, Peter}},
issn = {{1744-683X}},
language = {{eng}},
number = {{42}},
pages = {{8755--8767}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Anisotropic magnetic particles in a magnetic field}},
url = {{http://dx.doi.org/10.1039/c6sm01411a}},
doi = {{10.1039/c6sm01411a}},
volume = {{12}},
year = {{2016}},
}