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Magnetic Iron Oxide Nanowires Formed by Reactive Dewetting

DOI: 10.1021/acs.nanolett.7b05310 DOI Help

Authors: Roger Alexander Bennett (University of Reading) , Haitham A. Etman (University of Reading) , Hannah Hicks (University of Reading) , Leah Richards (University of Reading) , Chen Wu (University of Oxford) , Martin R. Castell (University of Oxford) , Sarnjeet S. Dhesi (Diamond Light Source) , Francesco Maccherozzi (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Letters

State: Published (Approved)
Published: March 2018
Diamond Proposal Number(s): 9309

Abstract: The growth and reactive dewetting of ultra-thin films of iron oxides supported on Re(0001) surfaces have been imaged in-situ in real time. Initial growth forms a non-magnetic stable FeO (w├╝stite like) layer in a commensurate network upon which high aspect ratio nanowires of several microns length but less than 40nm width can be fabricated. The nanowires are closely aligned with the substrate crystallography and imaging by X-ray magnetic circular dichroism shows that each contain a single magnetic domain. The driving force for dewetting appears to be the minimization of strain energy of the Fe3O4 crystallites and follows the Tersoff and Tromp model in which strain is minimized at constant height by extending in one epitaxially matched direction. Such wires are promising in spintronic applications and we predict that the growth will also occur on other hexagonal substrates.

Journal Keywords: Fe3O4; Re(0001); spintronics; XMCD; STM; XPEEM; LEEM; LEED; oxide ultra-thin films

Subject Areas: Materials, Physics


Instruments: I06-Nanoscience