TY - JOUR
T1 - Bias voltage dependence of tunneling magnetoresistance in granular C 60Co films with current-perpendicular-to-plane geometry
AU - Sakai, Seiji
AU - Mitani, Seiji
AU - Matsumoto, Yoshihiro
AU - Entani, Shiro
AU - Avramov, Pavel
AU - Ohtomo, Manabu
AU - Naramoto, Hiroshi
AU - Takanashi, Koki
PY - 2012/6/1
Y1 - 2012/6/1
N2 - Voltage-dependence of the tunneling magnetoresistance effect in the granular C 60Co films has been investigated for the samples with the current-perpendicular-to-plane geometry. The transport measurements under this geometry demonstrate that the granular C 60Co films show an unusual exponential bias voltage dependence of the magnetoresistance ratio down to zero voltage. Small characteristic energies of less than 10s meV are derived from the temperature dependences of the characteristic voltage in the exponential relationship. Considering the magnitudes of the voltage drop between Co nanoparticles and also the effect of cotunneling on the energy values, the characteristic energies for the voltage-induced degradation of the spin polarization are found to show a satisfactory agreement with that for the thermally-induced one. It can be reasonably expected that the onset of magnetic disorder to the localized d-electron spins at the interface region of the C 60-based matrix (C 60Co compound) with Co nanoparticles leading to the unusual voltage and temperature dependence of the magnetoresistance ratio and the spin polarization at low temperatures.
AB - Voltage-dependence of the tunneling magnetoresistance effect in the granular C 60Co films has been investigated for the samples with the current-perpendicular-to-plane geometry. The transport measurements under this geometry demonstrate that the granular C 60Co films show an unusual exponential bias voltage dependence of the magnetoresistance ratio down to zero voltage. Small characteristic energies of less than 10s meV are derived from the temperature dependences of the characteristic voltage in the exponential relationship. Considering the magnitudes of the voltage drop between Co nanoparticles and also the effect of cotunneling on the energy values, the characteristic energies for the voltage-induced degradation of the spin polarization are found to show a satisfactory agreement with that for the thermally-induced one. It can be reasonably expected that the onset of magnetic disorder to the localized d-electron spins at the interface region of the C 60-based matrix (C 60Co compound) with Co nanoparticles leading to the unusual voltage and temperature dependence of the magnetoresistance ratio and the spin polarization at low temperatures.
KW - Cobalt
KW - Fullerene
KW - Granular film
KW - Nanocarbonmagnetic metal hybrid structure
KW - Spin polarization
KW - Tunneling magnetoresitance effect
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U2 - 10.1016/j.jmmm.2012.01.033
DO - 10.1016/j.jmmm.2012.01.033
M3 - Article
AN - SCOPUS:84857920907
VL - 324
SP - 1970
EP - 1974
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 12
ER -