Broadband high-performance Faraday rotation spectroscopy of 2D materials and thin magnetic films

Rudolf Bratschitsch

doi:10.1117/12.2676664

28 September 2023 Broadband high-performance Faraday rotation spectroscopy of 2D materials and thin magnetic films

Rudolf Bratschitsch

Proceedings Volume PC12656, Spintronics XVI; PC126561L (2023) https://doi.org/10.1117/12.2676664
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Faraday rotation spectroscopy is a powerful experimental technique to measure the magneto-optical response of spintronic materials and devices. However, due to speed limiting components, such as polarization modulators and lock-in amplifiers, measurements become extremely challenging, in particular if (sub)micrometer spatial resolution is required. We present a high-performance broadband Faraday rotation spectroscopy technique for measurements on the micron scale. Spectral acquisition speeds of two orders of magnitude faster than state-of-the-art modulation spectroscopy setups are demonstrated. As an example, we perform Faraday rotation spectroscopy of excitons in hBN-encapsulated atomically thin WS2 and an amorphous magnetic TbFe alloy thin film.

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Rudolf Bratschitsch "Broadband high-performance Faraday rotation spectroscopy of 2D materials and thin magnetic films", Proc. SPIE PC12656, Spintronics XVI, PC126561L (28 September 2023); https://doi.org/10.1117/12.2676664

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KEYWORDS

Magnetism

Spectroscopy

2D materials

Thin films

Spectroscopes

Excitons

Modulation

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