Article ID Journal Published Year Pages File Type
1677622 Ultramicroscopy 2013 5 Pages PDF
Abstract

•GaAs/GaAsP strained superlattices are excellent candidates for spin-polarized electron beam.•Pulse spin-polarized electron beam is required for investigating the magnetic domain change.•Picosecond electron bunches were achieved from GaAs/GaAsP superlattice photocathode.•TEM observation revealed a small disorder of superlattice layers.•Improvement of superlattice periodicity can achieve much faster electron bunches.

GaAs/GaAsP strained superlattices are excellent candidates for use as spin-polarized electron sources. In the present study, picosecond electron bunches were successfully generated from such a superlattice photocathode. However, electron transport in the superlattice was much slower than in bulk GaAs. Transmission electron microscopy observations revealed that a small amount of variations in the uniformity of the layers was present in the superlattice. These variations lead to fluctuations in the superlattice mini-band structure and can affect electron transport. Thus, it is expected that if the periodicity of the superlattice can be improved, much faster electron bunches can be produced.

Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
Authors
, , , , , , ,