NV-center imaging of bubble domains in a 6 {\AA} film of cobalt with perpendicular magnetization

TL;DR

This study uses NV-center microscopy to image and analyze magnetic bubble domains in an ultra-thin cobalt film, providing high-resolution stray field maps crucial for understanding domain wall behavior.

Contribution

It demonstrates the application of scanning NV-center microscopy to quantitatively map stray fields in a 6 Å Co film, revealing details about domain wall types.

Findings

High-resolution stray field imaging of bubble domains

Potential to distinguish Bloch and Néel domain walls

Quantitative mapping at nanometer scale

Abstract

We employ a scanning NV-center microscope to perform stray field imaging of bubble magnetic domains in a perpendicularly magnetized Pt/Co/AlOx trilayer with 6 {\AA} of Co. The stray field created by the domain walls is quantitatively mapped with few-nanometer spatial resolution, with a probe-sample distance of about 100 nm. As an example of application, we show that it should be possible to determine the Bloch or N\'eel nature of the domain walls, which is of crucial importance to the understanding of current-controlled domain wall motion.