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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Magnetic circular dichroism in two-photon photoemission.

K Hild¹, J Maul, G Schönhense

¹Institut für Physik, Staudinger Weg 7, Universität Mainz, D-55128 Mainz, Germany.

Physical Review Letters

|March 5, 2009

Summary

We observed magnetic circular dichroism (MCD) in two-photon photoemission (2PPE) of Heusler alloys. This technique offers a new way to study surface magnetism with laboratory-based, time-resolved photoemission.

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Area of Science:

Solid-state physics
Surface science
Magnetism

Background:

Magnetic circular dichroism (MCD) is a sensitive probe of magnetic properties.
Two-photon photoemission (2PPE) is a powerful technique for studying electronic and magnetic properties of surfaces.
Heusler alloys are a class of magnetic materials with potential applications in spintronics.

Purpose of the Study:

To observe and characterize magnetic circular dichroism (MCD) in two-photon photoemission (2PPE).
To investigate the surface magnetism of Heusler alloys Ni2MnGa and Co2FeSi using 2PPE-MCD.
To provide a theoretical explanation for the observed 2PPE-MCD phenomena.

Main Methods:

Excitation of Heusler alloys (Ni2MnGa, Co2FeSi) using femtosecond laser light.
Measurement of magnetic circular dichroism (MCD) asymmetries in the two-photon photoemission (2PPE) spectra.
Local spin-density calculations to model the magnetic dichroic response.

Main Results:

Observation of MCD in 2PPE for Ni2MnGa and Co2FeSi.
Quantified MCD asymmetries: A=(3.5+/-0.5)x10{-3} for Ni2MnGa and A=(2.1+/-1.0)x10{-3} for Co2FeSi.
Good agreement between experimental 2PPE MCD results and theoretical calculations.

Conclusions:

2PPE-MCD is a viable technique for studying surface magnetism.
The observed magnetic contrast in 2PPE provides an alternative for time-resolved surface magnetism studies.
This method is practicable in a laboratory setting, offering new avenues for research.