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Electron-Assisted Relaxation of Spin Excited States in Cobalt Phthalocyanine Molecules on Au(111) Surface
Bin Li
Author NameAffiliationE-mail
Bin Li University of Science and Technology of China libin@mail.ustc.edu.cn 
Abstract:
We present our investigation on the spin relaxation of cobalt phthalocyanine (CoPc) films on Au(111) surface using scanning tunneling microscopy and spectroscopy. The spin relaxation time derived from the linewidth of spin-flip inelastic electron tunneling spectroscopy is quantitatively analyzed according to the Korringa-like formula. We find that although this regime of the spin relaxation time calculation by just considering the exchange interaction between itinerant conduction electrons and localized d-shells (s-d exchange interaction) can successfully reproduce the experimental spin relaxation time of the adsorbed magnetic atom, it fails in our case of CoPc/Au(111). Instead, we can obtain the relaxation times that are in good agreement with the experimental results by considering the fact that the ? electrons in CoPc molecules are spin polarized, where the spin polarized ? electrons extended at the Pc macrocycle may also scatter the conduction electrons in addition to the localized d spins. Our analyses indicate that the scattering by the ? electrons provides an efficient spin relaxation channel in addition to the s-d interaction and thus leads to much short relaxation time in such kind of molecular system on a metal substrate.
Key words:  Scanning tunneling microscopy  Spin relaxation  Single molecule  s-d coupling
FundProject:
Electron-Assisted Relaxation of Spin Excited States in Cobalt Phthalocyanine Molecules on Au(111) Surface
李斌
摘要:
We present our investigation on the spin relaxation of cobalt phthalocyanine (CoPc) films on Au(111) surface using scanning tunneling microscopy and spectroscopy. The spin relaxation time derived from the linewidth of spin-flip inelastic electron tunneling spectroscopy is quantitatively analyzed according to the Korringa-like formula. We find that although this regime of the spin relaxation time calculation by just considering the exchange interaction between itinerant conduction electrons and localized d-shells (s-d exchange interaction) can successfully reproduce the experimental spin relaxation time of the adsorbed magnetic atom, it fails in our case of CoPc/Au(111). Instead, we can obtain the relaxation times that are in good agreement with the experimental results by considering the fact that the ? electrons in CoPc molecules are spin polarized, where the spin polarized ? electrons extended at the Pc macrocycle may also scatter the conduction electrons in addition to the localized d spins. Our analyses indicate that the scattering by the ? electrons provides an efficient spin relaxation channel in addition to the s-d interaction and thus leads to much short relaxation time in such kind of molecular system on a metal substrate.
关键词:  Scanning tunneling microscopy  Spin relaxation  Single molecule  s-d coupling
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