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A compact cryogenic Kerr microscope for operation in the small volume ofhigh-field magnets is described. It is suited for measurements both in Voigtand Faraday configuration. Coupled with a pulsed laser source, the microscopeis used to measure the time-resolved Kerr rotation response of semiconductormicrostructures with ~1 micron spatial resolution. The microscope was designedto study spin transport, a critical issue in the field of spintronics. It isthus possible to generate spin polarization at a given location on amicrostructure and probe it at a different location. The operation of themicroscope is demonstrated by time-resolved measurements of micrometer distancediffusion of spin polarized electrons in a GaAs/AlGaAs heterojunction quantumwell at 4.2 K and 7 Tesla.

Compact cryogenic Kerr microscope for time-resolved studies of electron spin transport in microstructures