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Spin Current$
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Sadamichi Maekawa, Sergio O. Valenzuela, Eiji Saitoh, and Takashi Kimura

Print publication date: 2012

Print ISBN-13: 9780199600380

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199600380.001.0001

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Incoherent spin current

Incoherent spin current

(p.15) 2 Incoherent spin current
Spin Current

K. Ando

E. Saitoh

Oxford University Press

This chapter discusses a number of methods that can experimentally detect pure spin currents – spin currents without accompanying charge currents. One such method is the utilisation of the inverse spin Hall effect, a method that was demonstrated first by spin pumping and nonlocal techniques. In semiconductors, an optical method was also demonstrated. Lastly, as an alternative method, one can infer spin-current generation indirectly by measuring spin accumulation. The chapter also proposes a solution to the problem known as the conductivity mismatch problem of spin injection into a semiconductor. A way to overcome the problem is by using a ferromagnetic semiconductor as a spin source; another is to insert a spin-dependent interface resistance at a metal–semiconductor interface.

Keywords:   pure spin currents, charge currents, inverse spin Hall, semiconductors, spin accumulation

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