Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface

Abstract

The in-plane orientation of the magnetization in the center of domain walls is measured in Co/Ir(111) as a function of Co thickness via scanning electron microscopy with polarization analysis. Uncapped, thermally evaporated cobalt on an Ir(111) single-crystal surface is imaged in situ in ultra-high vacuum. The initial pseudomorphic growth with an atomically flat interface of cobalt on iridium ensures comparability to theoretical calculations and provides a study of an interface that is as ideal as possible. Below a cobalt thickness of 8.8 monolayers, the magnetic domain walls are purely Néel oriented and show a clockwise sense of rotation. For larger thicknesses the plane of rotation changes and the domain walls show a significant Bloch-like contribution, allowing to calculate the strength of the Dzyaloshinskii-Moriya interaction (DMI) from energy minimization. From the angle between the plane of rotation and the domain-wall normal an interfacial DMI parameter $D_s=-(1.07\pm 0.05)$ pJ/m is determined, which corresponds to a DMI energy per bond between two Co atoms at the interface of $d_{tot}=-(1.04\pm 0.05)$ meV.

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Cited by in corpus (5)

• The microscopic origin of DMI in magnetic bilayers and prediction of giant DMI in new bilayers
• Magnetic chirality controlled by the interlayer exchange interaction
• Extraction of Dzyaloshinksii-Moriya interaction from propagating spin waves validated
• Chirality-inverted Dzyaloshinskii-Moriya interaction
• Direct imaging of chiral domain walls and Néel-type skyrmionium in ferrimagnetic alloys