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arXiv · 1902.05523

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

Fabian Kloodt-Twesten·Susanne Kuhrau·Hans Peter Oepen·Robert Frömter
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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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Fabian Kloodt-Twesten, Susanne Kuhrau, Hans Peter Oepen, Robert Frömter. 2019-08-26. Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface. https://doi.org/10.1103/physrevb.100.100402

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