Papers › Order and Disorder in the Magnetisation of the Chiral Crystal CrNb₃S₆
Order and Disorder in the Magnetisation of the Chiral Crystal CrNb₃S₆
Gary W. Paterson, Tsukasa Koyama, Misako Shinozaki, Yusuke Masaki, Francisco. J. T. Goncalves, Yusuke Shimamoto, Tadayuki Sogo, Magnus Nord, Yusuke Kousaka, Yusuke Kato, Stephen McVitie, Yoshihiko Togawa
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Competing magnetic anisotropies in chiral crystals with Dzyaloshinskii Moriya exchange interactions can give rise to non-trivial chiral topological magnetisation configurations with new and interesting properties. One such configuration is the magnetic soliton, where the moment continuously rotates about an axis. This magnetic system can be considered to be one dimensional and, because of this, it supports a macroscale coherent magnetisation, giving rise to a tunable chiral soliton lattice (CSL) that is of potential use in a number of applications in nanomagnetism and spintronics. In this work we characterise the transitions between the forced-ferromagnetic (F-FM) phase and the CSL one in CrNb₃S₆ using differential phase contrast imaging in a scanning transmission electron microscope, conventional Fresnel imaging, ferromagnetic resonance spectroscopy, and mean-field modelling. We find that the formation and movement of dislocations mediate the formation of CSL and F-FM regions and that these strongly influence the highly hysteretic static and dynamic properties of the system. Sample size and morphology can be used to tailor the properties of the system and, with the application of magnetic field, to locate and stabalise normally unstable dislocations and modify their dimensions and magnetic configurations in ways beyond that predicted to occur in uniform films.
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