Sizeable magnetic circular dichroism of artificially precipitated Co clusters in amorphous carbon | Zendy

HuaShu Hsu | Zendy; W.Y. Su | Zendy; Pu-Cheng Chien | Zendy; S.T. Kuo | Zendy; ShihJye Sun | Zendy; Peihsuan Chuang | Zendy; ChihHao Lee | Zendy; G. H. Hwang | Zendy

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Sizeable magnetic circular dichroism of artificially precipitated Co clusters in amorphous carbon

Author(s) -

HuaShu Hsu,

W.Y. Su,

Pu-Cheng Chien,

S.T. Kuo,

ShihJye Sun,

Peihsuan Chuang,

ChihHao Lee,

G. H. Hwang

Publication year - 2012

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4747509

Subject(s) - magnetic circular dichroism , annealing (glass) , metastability , amorphous solid , materials science , amorphous carbon , nanoparticle , saturation (graph theory) , analytical chemistry (journal) , crystallography , spectral line , chemistry , nanotechnology , physics , mathematics , organic chemistry , chromatography , combinatorics , astronomy , composite material

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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