Spontaneous Biskyrmion Lattice in a Centrosymmetric Rhombohedral Rare-Earth Magnet with Easy-Plane Anisotropy

Abstract

Magnetic skyrmion and its derivatives have demonstrated fascinating topological behaviors with potential applications in future spintronic devices. Despite the recent progress, the spontaneous skyrmion lattice and successive topological transition in the magnets with easy-plane magnetic anisotropy are still elusive especially at room temperature. Here, in a centrosymmetric rhombohedral Nd2Co17 magnet with easy-plane magnetic anisotropy, spontaneous biskyrmions are observed over a wide temperature range across room temperature, and then evolve into enclosed in-plane domains with nanometric size due to the enhancement of the planar magnetic anisotropy. The spontaneous generation of the biskyrmion lattice and its evolution along different crystal orientations demonstrate the crucial role of intrinsic bi-anisotropy and demagnetization effects. This discovery provides a fundamental insight into the nature of topological magnetic textures in easy-plane anisotropy materials and suggests an arena to explore the topological states in rare-earth magnets as well as their applications in spintronics.

In situ transmission electron microscopy (TEM) study on the structural evolution behavior of nano Sn sheets under a thermal field

“…Its spatial resolution has achieved the sub-nanometer scale, enabling the observation of material properties at the subatomic level, thus rendering it an indispensable tool in the field of materials science. [40][41][42][43][44][45][46][47][48][49][50][51][52][53] Currently, the in situ technology based on Cs-TEM is rapidly advancing and has become a ubiquitous tool in nanotechnology, elevating Cs-TEM to a comprehensive nanoscale laboratory. [54][55][56][57][58][59][60][61][62][63] By utilizing the in situ Cs-TEM, we can dynamically observe a multitude of structural changes as well as physical and chemical properties in materials and devices in real-time.…”

Spontaneous Topological (Anti)meron Chains in the Domain Walls of Centrosymmetric Rare‐Earth Magnet

“…[22,23] Although topological meron textures have been observed in the chiral magnet CoZnMn [24] and 2D van der Waals magnet Fe-Ge-Te, [25,26] the underlying physical mechanism still remains unclear. Furthermore, biskyrmion magnetic textures or magnetic bubbles are commonly observed in centrosymmetric rare-earth magnets such as NdCo 5 [27] and Nd 2 Co 17 magnets, [28] however, topological meron textures with low topological charges have not been discovered in rare-earth magnets thus far. The strong spinlattice coupling and intricate magnetic interactions of 4f electrons in rare-earth magnets suggest the potential emergence of a multitude of topological spin textures, yet a comprehensive investigation into this phenomenon is still pending.…”