Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 20, Pages 6253-6259Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02381
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- German Science Foundation (DFG) [SPP 1959]
- Evangelisches Studienwerk Villigst e.V.
- Juelich Joint Redox Laboratory (JJRL)
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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.
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