Sizeable magnetic circular dichroism of artificially precipitated Co clusters in amorphous carbon
Source abstract
Abstract
This study examines sizeable magnetic circular dichroism (MCD) in Co(20%)-doped amorphous carbon (a-C) films. While as-grown films exhibit a non-detectable MCD signal, films that undergo rapid thermal annealing (RTA) at 600°C in a vacuum yield broad MCD spectra with a large amplitude of ∼3.9 × 104 deg/cm in saturation field 0.78 T at the σ-σ* gap transition (∼5.5 eV). In such films after RTA, the metastable Co-C bonding is decomposed and suitable Co nanoparticles/a-C interfaces are thus formed. Our results indicate that the large change in MCD is contributed from Co nanoparticles and associated with the spin-dependent electronic structure at the Co/a-C interfaces.
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Research context
OpenAlex topics: Diamond and Carbon-based Materials Research · Graphene research and applications · Carbon Nanotubes in Composites
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Affiliations
National Pingtung University of Education 1 Department of Applied Physics, , Pingtung 900, Taiwan, Republic of China
National Kaohsiung Normal University 4 Department of Physics, , Kaohsiung 824, Taiwan, Republic of China
National University of Kaohsiung 2 Department of Applied Physics, , Kaohsiung 811, Taiwan, Republic of China
National Tsing-Hua University, 3 Department of Engineering and System Science, HsinChu 300, Taiwan, Republic of China
Funding
National Science Council Taiwan
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