A centrosymmetric hexagonal magnet with superstable biskyrmion magnetic nanodomains in a wide temperature range of 100K to 340K

TL;DR

This paper reports the discovery of stable biskyrmion magnetic nanodomains in a centrosymmetric hexagonal magnet over a wide temperature range, with implications for spintronic device development.

Contribution

It presents the experimental observation of stable biskyrmions at room temperature in a centrosymmetric magnet, expanding the operational conditions for skyrmion-based applications.

Findings

Biskyrmion phase stable from 100K to 340K.

Observation of a topological Hall effect derived from biskyrmions.

Use of phase reconstruction and TEM to characterize spin textures.

Abstract

Here, we report on the experimental discovery of biskyrmion magnetic nanodomains at RT and the observation of a biskyrmion-derived topological Hall effect (THE) in the centrosymmetric hexagonal MnNiGa magnet. Using a phase reconstruction technique based on a transport-of-intensity equation (TIE), we established the texture of the biskyrmion spin. Results from Lorentz transmission electron microscopy (TEM) and the topological Hall effect revealed that the biskyrmion phase is stable over a much wider temperature range (100 K to ~340K) and a larger magnetic field range in our material than in skyrmion-hosting bulk crystals reported previously[1-3,6]. The super-wide operating temperature and the broad range of material options indicate important progress toward the realization of skyrmion-based spintronic devices.