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

TL;DR

This paper introduces a high-repetition-rate, element-resolved magneto-optical setup in the extreme ultraviolet range, enabling detailed studies of demagnetization dynamics across temperatures with high flux and stability.

Contribution

The novel setup combines a fiber laser-driven EUV source with a cryostat and electromagnet, allowing unprecedented element-specific magnetization measurements at high repetition rates.

Findings

Element-dependent demagnetization dynamics observed.

High flux EUV source enables stable, high-rate measurements.

Temperature-dependent magnetization behavior characterized.

Abstract

We present a novel setup to measure the transverse magneto-optical Kerr effect in the extreme ultraviolet spectral range at exceptionally high repetition rates based on a fiber laser amplifier system. This affords a very high and stable flux of extreme ultraviolet light, which we use to measure element-resolved demagnetization dynamics with unprecedented depth of information. Furthermore, the setup is equipped with a strong electromagnet and a cryostat, allowing measurements between 10 and 420 K using magnetic fields up to 0.86 T. The performance of our setup is demonstrated by a set of temperature- and time-dependent magnetization measurements showing distinct element-dependent behavior.