Realization of Spin-dependent Functionality by Covering
a Metal Surface with a Single Layer of Molecules
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Posted on 2019-09-06 - 10:13
An
interface of molecule and metal has attracted much attention
in the research field of nanoelectronics because of their high degree
of design freedom. Here, we demonstrate an efficient spin-to-charge
current conversion at the metal surface covered by a single layer
of molecules. Spin currents are injected into an interface between
metal (Cu) and lead(II) phthalocyanine by means of the spin pumping
method. An observed voltage signal is caused by the inverse Edelstein
effect, i.e., spin-to-charge current conversion at the interface.
The conversion coefficient, inverse Edelstein length, is estimated
to be 0.40 ± 0.06 nm, comparable with the largest Rashba spin
splitting of interfaces with heavy metals. Interestingly, the Edelstein
length strongly depends on the thickness of the molecule and takes
a maximum value when a single layer of molecules is formed on the
Cu surface. Comparative analysis between scanning probe microscopy
and first-principles calculations reveal that the formation of interface
state with Rashba spin splitting causes the inverse Edelstein effect,
whose magnitude is sensitive to the adsorption configuration of the
molecules.
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Isshiki, H.; Kondou, K.; Takizawa, S.; Shimose, K.; Kawabe, T.; Minamitani, E.; et al. (2019). Realization of Spin-dependent Functionality by Covering
a Metal Surface with a Single Layer of Molecules. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.9b02619