Creation of a Chiral Bobber Lattice in Helimagnet-Multilayer Heterostructures

Abstract

A chiral bobber is a localized three-dimensional magnetization configuration, terminated by a singularity. Chiral bobbers coexist with magnetic skyrmions in chiral magnets, lending themselves to new types of skyrmion-complementary bits of information. However, the on-demand creation of bobbers, as well as their direct observation remained elusive. Here, we introduce a new mechanism for creating a stable chiral bobber lattice state via the proximity of two skyrmion species with comparable size. This effect is experimentally demonstrated in a Cu${}_2$OSeO${}_3$/[Ta/CoFeB/MgO]${}_4$ heterostructure in which an exotic bobber lattice state emerges in the phase diagram of Cu${}_2$OSeO${}_3$. To unambiguously reveal the existence of the chiral bobber lattice state, we have developed a novel characterization technique, magnetic truncation rod analysis, which is based on resonant elastic x-ray scattering.

References in corpus (8)

• A new class of chiral materials hosting magnetic skyrmions beyond room temperature
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• Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
• Observation of two independent skyrmion phases in a chiral magnetic material
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• Surface twist instabilities and skyrmion states in chiral ferromagnets
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• Quantum and classical magnetic Bloch points
• X-ray holography of skyrmionic cocoons in aperiodic magnetic multilayers
• Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers
• Controlling Skyrmion Lattices via Strain: Elongation, Tilting, and Collapse Mechanisms
• Double-$Q$ chiral stripe order in the anomalous Hall antiferromagnet CoNb${}_3$S${}_6$
• Hopfions in screw chiral magnets
• Phase-Factor-Controlled Surface Spirals in the Magnetic Conical Phase: The Role of In-Plane Directionality