Issue 14, 2019

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

Abstract

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.

Graphical abstract: Surface-mediated spin dynamics probed by optical-pump–probe scanning tunneling microscopy

Supplementary files

Article information

Article type
Communication
Submitted
21 十二月 2018
Accepted
28 一月 2019
First published
28 一月 2019

Phys. Chem. Chem. Phys., 2019,21, 7256-7260

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

Z. Wang, C. Yoon, S. Yoshida, Y. Arashida, O. Takeuchi, Y. Ohno and H. Shigekawa, Phys. Chem. Chem. Phys., 2019, 21, 7256 DOI: 10.1039/C8CP07786J

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