Ultrafast element-resolved magneto-optics using a fiber-laser-driven extreme ultraviolet light source

Area of Science:

• Materials Science
• Condensed Matter Physics
• Spectroscopy

Background:

• The transverse magneto-optical Kerr effect (T-MOKE) is crucial for understanding magnetic properties.
• Measuring T-MOKE in the extreme ultraviolet (EUV) range offers unique insights into element-specific magnetic dynamics.
• Previous setups faced limitations in resolution and environmental control.

Purpose of the Study:

• To present a novel experimental setup for measuring the transverse magneto-optical Kerr effect in the EUV spectral range.
• To enable element-resolved studies of demagnetization dynamics.
• To provide a versatile platform for temperature- and time-dependent magnetic measurements.

Main Methods:

• Utilized a fiber laser amplifier system with a 100-300 kHz repetition rate for EUV generation.
• Integrated a strong electromagnet and a cryostat for measurements from 10 K to 420 K.
• Applied magnetic fields up to 0.86 T.

Main Results:

• Successfully demonstrated the setup's performance through temperature- and time-dependent magnetization measurements.
• Achieved element-resolved analysis of demagnetization dynamics.
• Validated the capability for precise magnetic characterization across a wide temperature range.

Conclusions:

• The novel EUV T-MOKE setup is a powerful tool for investigating ultrafast magnetic phenomena.
• Element-resolved demagnetization dynamics can be studied with high precision.
• The system facilitates comprehensive magnetic material characterization under varying temperature and magnetic field conditions.