Photoemission study of the spin-density wave state in thin films of Cr

TL;DR

This study uses angle-resolved photoemission to investigate the spin-density wave state in thin Cr films, revealing how electronic band dispersion relates to magnetic interactions and excitations.

Contribution

It introduces a method combining photoemission data with theoretical calculations to analyze SDW states and extract key interaction parameters.

Findings

Incommensurate SDW can be monitored via electronic band dispersion.

Coupling strength and magnetic excitation energies can be determined from ARPES data.

Method applicable to other SDW and magnetic multilayer systems.

Abstract

Angle-resolved photoemission (PE) was used to characterize the spin-density wave (SDW) state in thin films of Cr grown on W(110). The PE data were analysed using results of local spin density approximation layer-Korringa-Kohn-Rostoker calculations. It is shown that the incommensurate SDW can be monitored and important parameters of SDW-related interactions, such as coupling strength and energy of collective magnetic excitations, can be determined from the dispersion of the renormalized electronic bands close to the Fermi energy. The developed approach can readily be applied to other SDW systems including magnetic multilayer structures.