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The role of chemical structure on the magnetic and electronic properties of Co2FeAl0.5Si0.5/Si(111) interface
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Kuerbanjiang, Balati, Nedelkoski, Zlatko, Kepaptsoglou, Demie, Ghasemi, Arsham, Glover, Stephanie E., Yamada, Shinya, Saerbeck, Thomas, Ramasse, Quentin M., Hasnip, Philip J., Hase, Thomas P. A., Bell, Gavin R., Hamaya, Kohei, Hirohata, Atsufumi and Lazarov, Vlado K. (2016) The role of chemical structure on the magnetic and electronic properties of Co2FeAl0.5Si0.5/Si(111) interface. Applied Physics Letters, 108 (17). 172412. doi:10.1063/1.4948466 ISSN 0003-6951.
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Official URL: http://dx.doi.org/10.1063/1.4948466
Abstract
We show that Co2FeAl0.5Si0.5film deposited on Si(111) has a single crystal structure and twin related epitaxial relationship with the substrate. Sub-nanometer electron energy loss spectroscopy shows that in a narrow interface region there is a mutual inter-diffusion dominated by Si and Co. Atomic resolution aberration-corrected scanning transmission electron microscopy reveals that the film has B2 ordering. The film lattice structure is unaltered even at the interface due to the substitutional nature of the intermixing. First-principles calculations performed using structural models based on the aberration corrected electron microscopy show that the increased Si incorporation in the film leads to a gradual decrease of the magnetic moment as well as significant spin-polarization reduction. These effects can have significant detrimental role on the spin injection from the Co2FeAl0.5Si0.5 film into the Si substrate, besides the structural integrity of this junction.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Semiconductors, Surface chemistry | ||||||||
Journal or Publication Title: | Applied Physics Letters | ||||||||
Publisher: | American Institute of Physics | ||||||||
ISSN: | 0003-6951 | ||||||||
Official Date: | 29 April 2016 | ||||||||
Dates: |
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Volume: | 108 | ||||||||
Number: | 17 | ||||||||
Article Number: | 172412 | ||||||||
DOI: | 10.1063/1.4948466 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 1 June 2016 | ||||||||
Date of first compliant Open Access: | 1 June 2016 | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
Grant number: | EP/ K03278X/1 (EPSRC), EP/K032852/1 (EPSRC) | ||||||||
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