Room temperature ferromagnetism in Co-doped amorphous carbon composites from the spin polarized semiconductor band
- Department of Applied Physics, National Pingtung University, Pingtung 900, Taiwan (China)
- Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China)
- Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 300, Taiwan (China)
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.
- OSTI ID:
- 22314497
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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