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Title: Room temperature ferromagnetism in Co-doped amorphous carbon composites from the spin polarized semiconductor band

This study provides conclusive evidence of room temperature ferromagnetism in Co-doped amorphous carbon (a-C) composites from the spin polarized semiconductor band. These composites are constructed from discontinuous [Co(3 nm)/a-C(d{sub c} nm)]{sub 5} multilayers with d{sub c} = 3 nm and d{sub c} = 6 nm. Only remnant circular dichroism (CD) was observed from the d{sub c} = 3 nm sample but not when d{sub c} = 6 nm. In addition, the remnant CD peaks at 5.5 eV, which is comparable with the absorption peak associated with the C σ-σ* gap transition. We suggest that the possible mechanism for this coupling can be considered as a magnetic proximity effect in which a ferromagnetic moment in the C medium is induced by Co/C interfaces.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Applied Physics, National Pingtung University, Pingtung 900, Taiwan (China)
  2. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China)
  3. Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 300, Taiwan (China)
Publication Date:
OSTI Identifier:
22314497
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARBON; DICHROISM; DOPED MATERIALS; FERROMAGNETISM; PROXIMITY EFFECT; SEMICONDUCTOR MATERIALS; SPIN ORIENTATION; TEMPERATURE RANGE 0273-0400 K