Femtosecond optical orientation triggering magnetization precession in epitaxial EuO films

Area of Science:

• Condensed Matter Physics
• Materials Science
• Optoelectronics

Background:

• Ultrafast magnetization dynamics are crucial for information transfer via spin manipulation.
• Exploring novel materials with efficient ultrafast magnetization mechanisms is essential for advancing spintronics.
• EuO-based ferromagnets offer potential for light-controlled magnetic properties.

Purpose of the Study:

• To investigate the ultrafast light-induced magnetization dynamics in EuO-based ferromagnets.
• To identify the underlying mechanisms responsible for photo-induced magnetization precession.
• To explore the potential applications of these materials in optoelectronics and spintronics.

Main Methods:

• Time-resolved two-colour stroboscopic pump-probe measurements were employed.
• Experiments were conducted on epitaxial films of pristine and Gd-doped EuO.
• Parameters such as temperature, magnetic field, and pump beam polarization helicity were varied.

Main Results:

• Photo-induced magnetization precession was observed in both semiconductor and metallic Gd-doped EuO films.
• The electronic transition 4f75d0 → 4f65d1 was identified as the mechanism triggering collective magnetization precession.
• Comparative studies provided insights into the influence of experimental conditions on the dynamics.

Conclusions:

• Optical spin orientation via specific electronic transitions is a viable mechanism for ultrafast magnetization control in EuO.
• EuO-based ferromagnets demonstrate significant potential for applications in optoelectronics and spintronics.
• The findings contribute to the development of next-generation data storage and processing technologies.