Imaging the Interaction of Electrical Currents with Magnetization Distributions

Frömter, Robert; Corredor, Edna C.; Hankemeier, S.; Kloodt-Twesten, Fabian; Kuhrau, Susanne; Lofink, Fabian; Rößler, Stefan; Oepen, Hans Peter

doi:10.1007/978-3-319-99558-8_17

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“…SEMPA is well established as a magnetic imaging technique for the investigation of static magnetic structures ranging from hundreds of microns down to 3 nm in size [42]. It is a surface sensitive technique that measures two components of the magnetization simultaneously [43][44][45] with a depth of information of about 0.5 nm [42,46] Recently, also the nanosecond magnetization dynamics became accessible [47][48][49]. The SEMPA system used here is sensitive to the in-plane spin polarization and allows for vectorial imaging of the in-plane magnetization orientation with 4° precision for each pixel of an image [50], which is prerequisite for the investigation of the angle of DW magnetization [17,38,51].…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2019

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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 s = −(1.07 ± 0.05) pJ m ⁄ is determined, which corresponds to a DMI energy per bond between two Co atoms at the interface of tot = −(1.04 ± 0.05) meV.

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