Magnetic properties of silica coated spindle-type hematite particles
Reufer, M. ; Dietsch, H. ; Gasser, U. ; Grobety, B. ; Hirt, A. M. ; Malik, V. K. and Schurtenberger, Peter LU
(2011)
In Journal of Physics: Condensed Matter
23(6).
- Abstract
- Magnetic properties of particles are generally determined from randomly oriented ensembles and the influence of the particle orientation on the magnetic response is neglected. Here, we report on the magnetic characterization of anisotropic spindle-type hematite particles. The easy axis of magnetization is within the basal plane of hematite, which is oriented perpendicular to the spindle axis. Two standard synthesis routes are compared and the effects of silica coating and particle orientation on the magnetic properties are investigated. Depending on the synthesis route we find fundamentally different magnetic behavior compatible with either single domain particles or superparamagnetic sub-units. Furthermore, we show that silica coating... (More)
- Magnetic properties of particles are generally determined from randomly oriented ensembles and the influence of the particle orientation on the magnetic response is neglected. Here, we report on the magnetic characterization of anisotropic spindle-type hematite particles. The easy axis of magnetization is within the basal plane of hematite, which is oriented perpendicular to the spindle axis. Two standard synthesis routes are compared and the effects of silica coating and particle orientation on the magnetic properties are investigated. Depending on the synthesis route we find fundamentally different magnetic behavior compatible with either single domain particles or superparamagnetic sub-units. Furthermore, we show that silica coating reduces the mean blocking temperature to nearly room temperature. The mechanical stress induced by the silica coating appears to reduce the magnetic coupling between the sub-units. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1882449
- author
- Reufer, M.
; Dietsch, H.
; Gasser, U.
; Grobety, B.
; Hirt, A. M.
; Malik, V. K.
and Schurtenberger, Peter
LU
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physics: Condensed Matter
- volume
- 23
- issue
- 6
- publisher
- IOP Publishing
- external identifiers
-
- wos:000286624000002
- scopus:79551680096
- pmid:21406920
- ISSN
- 1361-648X
- DOI
- 10.1088/0953-8984/23/6/065102
- language
- English
- LU publication?
- yes
- id
- 938878b7-1eca-454d-b77c-1aa1fa176791 (old id 1882449)
- date added to LUP
- 2016-04-01 14:13:39
- date last changed
- 2022-04-22 02:07:07
@article{938878b7-1eca-454d-b77c-1aa1fa176791,
abstract = {{Magnetic properties of particles are generally determined from randomly oriented ensembles and the influence of the particle orientation on the magnetic response is neglected. Here, we report on the magnetic characterization of anisotropic spindle-type hematite particles. The easy axis of magnetization is within the basal plane of hematite, which is oriented perpendicular to the spindle axis. Two standard synthesis routes are compared and the effects of silica coating and particle orientation on the magnetic properties are investigated. Depending on the synthesis route we find fundamentally different magnetic behavior compatible with either single domain particles or superparamagnetic sub-units. Furthermore, we show that silica coating reduces the mean blocking temperature to nearly room temperature. The mechanical stress induced by the silica coating appears to reduce the magnetic coupling between the sub-units.}},
author = {{Reufer, M. and Dietsch, H. and Gasser, U. and Grobety, B. and Hirt, A. M. and Malik, V. K. and Schurtenberger, Peter}},
issn = {{1361-648X}},
language = {{eng}},
number = {{6}},
publisher = {{IOP Publishing}},
series = {{Journal of Physics: Condensed Matter}},
title = {{Magnetic properties of silica coated spindle-type hematite particles}},
url = {{http://dx.doi.org/10.1088/0953-8984/23/6/065102}},
doi = {{10.1088/0953-8984/23/6/065102}},
volume = {{23}},
year = {{2011}},
}