Universität zu Köln

Zakutna, Dominika ORCID: 0000-0001-9417-6514, Falke, Yannic, Dresen, Dominique, Prevost, Sylvain ORCID: 0000-0002-6008-1987, Bender, Philipp ORCID: 0000-0002-2492-3956, Honecker, Dirk ORCID: 0000-0003-0763-982X and Disch, Sabrina ORCID: 0000-0002-4565-189X (2019). Morphological and crystallographic orientation of hematite spindles in an applied magnetic field. Nanoscale, 11 (15). S. 7149 - 7157. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2040-3372

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Abstract

The magnetic response of spindle-shaped hematite (-Fe2O3) nanoparticles was investigated by simultaneous small-angle and wide-angle X-ray scattering (SAXS/WAXS) experiments. The field-dependent magnetic and nematic order parameters of the magnetic single-domain nanospindles in a static magnetic field are fully described by SAXS simulations of an oriented ellipsoid with the implemented Langevin function. The experimental scattering intensities of the spindle-like particles can be modeled simply by using the geometrical (length, radius, size distribution) and magnetic parameters (strength of magnetic field, magnetic moment) obtained from isotropic SAXS and macroscopic magnetization measurements, respectively. Whereas SAXS gives information on the morphological particle orientation in the applied field, WAXS texture analysis elucidates the atomic scale orientation of the magnetic easy direction in the hematite crystal structure. Our results strongly suggest the tendency for uniaxial anisotropy but indicate significant thermal fluctuations of the particle moments within the hematite basal plane.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zakutna, Dominika UNSPECIFIED orcid.org/0000-0001-9417-6514 UNSPECIFIED Falke, Yannic UNSPECIFIED UNSPECIFIED UNSPECIFIED Dresen, Dominique UNSPECIFIED UNSPECIFIED UNSPECIFIED Prevost, Sylvain UNSPECIFIED orcid.org/0000-0002-6008-1987 UNSPECIFIED Bender, Philipp UNSPECIFIED orcid.org/0000-0002-2492-3956 UNSPECIFIED Honecker, Dirk UNSPECIFIED orcid.org/0000-0003-0763-982X UNSPECIFIED Disch, Sabrina UNSPECIFIED orcid.org/0000-0002-4565-189X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-150483
DOI:	10.1039/c8nr09583c
Journal or Publication Title:	Nanoscale
Volume:	11
Number:	15
Page Range:	S. 7149 - 7157
Date:	2019
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2040-3372
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MONTE-CARLO; PARTICLES; COLLOIDS; NANOPARTICLES; ELLIPSOIDS; SCATTERING; HYDROGELS; ALIGNMENT; PHASES Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15048