# Discrete Hall resistivity contribution from N\'{e}el skyrmions in multilayer nanodiscs

## TL;DR

This study demonstrates room-temperature skyrmions in Pt/Co/Ir nanodiscs and reveals a discrete Hall resistivity contribution from individual skyrmions, crucial for electrical detection in skyrmion-based devices.

## Contribution

It reports a quantized Hall resistivity contribution from individual skyrmions, independent of their size, in nanodiscs at room temperature.

## Key findings

- Each skyrmion contributes approximately 22 nΩ·cm to Hall resistivity.
- The resistivity contribution is independent of skyrmion size.
- The results enable electrical detection of skyrmions in spintronic devices.

## Abstract

Magnetic skyrmions are knot-like quasiparticles. They are candidates for non-volatile data storage in which information is moved between fixed read and write terminals. Read-out operation of skyrmion-based spintronic devices will rely upon electrical detection of a single magnetic skyrmion within a nanostructure. Here, we present Pt/Co/Ir nanodiscs which support skyrmions at room temperature. We measured the Hall resistivity whilst simultaneously imaging the spin texture using magnetic scanning transmission x-ray microscopy (STXM). The Hall resistivity is correlated to both the presence and size of the skyrmion. The size-dependent part matches the expected anomalous Hall signal when averaging the magnetisation over the entire disc. We observed a resistivity contribution which only depends on the number and sign of skyrmion-like objects present in the disc. Each skyrmion gives rise to 22$\pm$2 n{\Omega} cm irrespective of its size. This contribution needs to be considered in all-electrical detection schemes applied to skyrmion-based devices.

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Source: https://tomesphere.com/paper/1706.06024