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

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Spintronics aims to utilize electron spin for novel electronic devices.
• Studying spin transport in semiconductors requires specialized high-resolution techniques.
• Existing methods face limitations in small volumes and high magnetic fields.

Purpose of the Study:

• To describe a novel compact cryogenic Kerr microscope.
• To enable time-resolved measurements of spin dynamics in semiconductor microstructures.
• To facilitate research in spintronics by probing spin transport.

Main Methods:

• Development of a compact cryogenic Kerr microscope.
• Utilizing a pulsed laser source for time-resolved Kerr rotation measurements.
• Operating the microscope in Voigt and Faraday configurations within high-field magnets.

Main Results:

• Achieved approximately 1 mum spatial resolution for Kerr rotation measurements.
• Demonstrated time-resolved measurements of spin-polarized electron diffusion.
• Successfully operated the microscope at 4.2 K and 7 T.

Conclusions:

• The developed cryogenic Kerr microscope is effective for studying spin transport.
• The microscope offers high spatial and temporal resolution for semiconductor microstructures.
• This tool advances research in spintronics and spin dynamics.