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Instruments / Technical Area	Publication Details	Published	Actions
I10-Beamline for Advanced Dichroism - scattering	Evolution of emergent monopoles into magnetic skyrmion strings Haonan Jin , Wancong Tan , Yizhou Liu , Kejing Ran , Raymond Fan , Yanyan Shangguan , Yao Guang , Gerrit Van Der Laan , Thorsten Hesjedal , Jinsheng Wen , Guoqiang Yu , Shilei Zhang Nano Letters DOI: 10.1021/acs.nanolett.3c01117 Diamond Proposal Number(s): [27692, 28933, 30749] Open Access Show Abstract ▼ Abstract: Topological defects are fundamental concepts in physics, but little is known about the transition between distinct types across different dimensionalities. In topological magnetism, as in field theory, the transition between 1D strings and 0D monopoles is a key process whose observation has remained elusive. Here, we introduce a novel mechanism that allows for the controlled stabilization of emergent monopoles and show that magnetic skyrmion strings can be folded into monopoles. Conversely, they act as seeds out of which the entire string structure can unfold, containing its complete information. In chiral magnets, this process can be observed by resonant elastic X-ray scattering when the objects are in proximity to a polarized ferromagnet, whereby a pure monopole lattice is emerging on the surface. Our experimental proof of the reversible evolution from monopole to string sheds new light on topological defects and establishes the emergent monopole lattice as a new 3D topological phase.	Jun 2023
I10-Beamline for Advanced Dichroism - scattering	Axially bound magnetic skyrmions: glueing topological strings across an interface Kejing Ran , Yizhou Liu , Haonan Jin , Yanyan Shangguan , Yao Guang , Jinsheng Wen , Guoqiang Yu , Gerrit Van Der Laan , Thorsten Hesjedal , Shilei Zhang Nano Letters 68 DOI: 10.1021/acs.nanolett.2c00689 Diamond Proposal Number(s): [26148] Open Access Show Abstract ▼ Abstract: A major challenge in topological magnetism lies in the three-dimensional (3D) exploration of their magnetic textures. A recent focus has been the question of how 2D skyrmion sheets vertically stack to form distinct types of 3D topological strings. Being able to manipulate the vertical coupling should therefore provide a route to the engineering of topological states. Here, we present a new type of axially bound magnetic skyrmion string state in which the strings in two distinct materials are glued together across their interface. With quasi-tomographic resonant elastic X-ray scattering, the 3D skyrmion profiles before and after their binding across the interface were unambiguously determined and compared. Their attractive binding is accompanied by repulsive twisting; i.e., the coupled skyrmions mutually affect each other via a compensating twisting. This state exists in chiral magnet–magnetic thin film heterostructures, providing a new arena for the engineering of 3D topological phases.	Apr 2022

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