Surface-mediated spin dynamics probed by optical-pump-probe scanning tunneling microscopy

In current materials science and technologies, surface effects on carrier and spin dynamics in functional materials and devices are of great importance. In this paper, we present the surface-sensitive probing of electron spin dynamics, performed by optical-pump-probe scanning tunneling microscopy (O...

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Bibliographic Details
Published inPhysical chemistry chemical physics : PCCP Vol. 21; no. 14; pp. 7256 - 7260
Main Authors Wang, Zi-Han, Yoon, Cheul-Hyun, Yoshida, Shoji, Arashida, Yusuke, Takeuchi, Osamu, Ohno, Yuzo, Shigekawa, Hidemi
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 2019
Subjects
Density
Electron spin
Functional materials
Manganese
Materials science
Microscopy
Scanning tunneling microscopy
Spin dynamics
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Summary:In current materials science and technologies, surface effects on carrier and spin dynamics in functional materials and devices are of great importance. In this paper, we present the surface-sensitive probing of electron spin dynamics, performed by optical-pump-probe scanning tunneling microscopy (OPP-STM). Time-resolved spin lifetime information on a manganese (Mn)-deposited GaAs(110) surface was successfully obtained for the first time. With increasing Mn density via in situ evaporation, a nonlinear change in the spin lifetime in the picosecond range was clearly observed, while directly confirming the Mn density by STM. In comparison with the results obtained by the conventional OPP method, we have also demonstrated that the observed nonlinear spin lifetime behavior was surface-mediated, which can be characterized using only the surface-sensitive OPP-STM technique.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c8cp07786j