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Spin-valve phototransistor Biqin Huang,a

Summary: Spin-valve phototransistor
Biqin Huang,a
Igor Altfeder, and Ian Appelbaum
Electrical and Computer Engineering Department, University of Delaware, Newark, Delaware 19716
Received 9 September 2006; accepted 30 October 2006; published online 29 January 2007
The spin-valve phototransistor is a semiconductor-ferromagnetic metal multilayer-semiconductor
transistor operated by photoexciting hot electrons in the emitter semiconductor into a Schottky
collector. This device uses an ultra-high vacuum-bonded float zone Si/multilayer/n-InP structure. To
distinguish the emitter interband-excited component of collector current from base/collector internal
photoemission, a lock-in spectroscopy sensitive only to the magnetocurrent is used. The
experimental results indicate a pathway to improve the magnetocurrent of a related device, the
spin-valve photodiode, by increasing the fraction of hot electron current that travels through both
layers of the ferromagnetic spin valve and demonstrate that hot electrons photogenerated in one
semiconductor can be collected by another through a thin ferromagnetic multilayer. 2007
American Institute of Physics. DOI: 10.1063/1.2436715
The use of optical excitation to study perpendicular hot
electron transport in spin-valve devices has several advan-
tages: energy tunability, temporal modulation, and remote
actuation, etc. One example of a spin-valve device making
use of optical excitation is the spin-valve photodiode


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science