Fluctuations of Spin Current

Abstract

When a bias voltage is applied to a small conductor, the current fluctuates due to the partition process of electrons. This fluctuation called shot noise gives us the fundamental information of the transport process. On the other hands, the spin current is one of key issue in the spintronics field and the generation and detection of those have been intensively studied by using various materials. The letter reported the first observation of the shot noise caused by a spin current which is induced by a spin accumulation in an all-semiconductor lateral spin-valve device.