Universität zu Köln

Stadler, Daniel ORCID: 0000-0003-3233-9167, Mueller, David N., Brede, Thomas ORCID: 0000-0002-6041-9052, Duchon, Tomas ORCID: 0000-0002-3035-012X, Fischer, Thomas, Sarkar, Anirban ORCID: 0000-0002-2744-0378, Giesen, Margret ORCID: 0000-0002-7656-887X, Schneider, Claus M. ORCID: 0000-0002-3920-6255, Volkert, Cynthia A. and Mathur, Sanjay (2019). Magnetic Field-Assisted Chemical Vapor Deposition of Iron Oxide Thin Films: Influence of Field-Matter Interactions on Phase Composition and Morphology. J. Phys. Chem. Lett., 10 (20). S. 6253 - 6266. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

Magnetic field-assisted CVD offers a direct pathway to manipulate the evolution of microstructure, phase composition, and magnetic properties of the as-prepared film. We report on the role of applied magnetic fields (0.5 T) during a cold-wall CVD deposition of iron oxide from [Fe-III((OBu)-Bu-t)(3)](2) leading to higher crystallinity, larger particulates, and better out-of-plane magnetic anisotropy, if compared with zero-field depositions. Whereas selective formation of homogeneous magnetite films was observed for the field-assisted process, coexistence of hematite and amorphous iron(III) oxide was confirmed under zero-field conditions. Comparison of the coercive field (11 vs 60 mT) indicated lower defect concentration for the field-assisted process with nearly superparamagnetic behavior. X-ray photoemission electron microscopy (X-PEEM) in absorption mode at the O-K and Fe-L-3,L-2 edges confirmed the selective formation of magnetite (field-assisted) and hematite (zero-field) with coexisting amorphous phases, respectively, emphasizing the importance of field-matter interactions in the phase-selective synthesis of magnetic thin films.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stadler, Daniel UNSPECIFIED orcid.org/0000-0003-3233-9167 UNSPECIFIED Mueller, David N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brede, Thomas UNSPECIFIED orcid.org/0000-0002-6041-9052 UNSPECIFIED Duchon, Tomas UNSPECIFIED orcid.org/0000-0002-3035-012X UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Sarkar, Anirban UNSPECIFIED orcid.org/0000-0002-2744-0378 UNSPECIFIED Giesen, Margret UNSPECIFIED orcid.org/0000-0002-7656-887X UNSPECIFIED Schneider, Claus M. UNSPECIFIED orcid.org/0000-0002-3920-6255 UNSPECIFIED Volkert, Cynthia A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-130692
DOI:	10.1021/acs.jpclett.9b02381
Journal or Publication Title:	J. Phys. Chem. Lett.
Volume:	10
Number:	20
Page Range:	S. 6253 - 6266
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1948-7185
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language X-RAY-ABSORPTION; GROWTH; NANOPARTICLES; SPECTROSCOPY; PHOTOANODES Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13069