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      Origin of skyrmion lattice phase splitting in Zn-substituted Cu\(_{2}\)OSeO\(_{3}\)

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          Abstract

          We present an investigation into the structural and magnetic properties of Zn-substituted Cu\(_{2}\)OSeO\(_{3}\), a system in which the skyrmion lattice (SkL) phase in the magnetic field-temperature phase diagram was previously seen to split as a function of increasing Zn concentration. We find that splitting of the SkL is only observed in polycrystalline samples and reflects the occurrence of several coexisting phases with different Zn content, each distinguished by different magnetic behaviour. No such multiphase behaviour is observed in single crystal samples.

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          Real-space observation of a two-dimensional skyrmion crystal.

          X. Yu, Y Onose, N Kanazawa … (2010)
          Crystal order is not restricted to the periodic atomic array, but can also be found in electronic systems such as the Wigner crystal or in the form of orbital order, stripe order and magnetic order. In the case of magnetic order, spins align parallel to each other in ferromagnets and antiparallel in antiferromagnets. In other, less conventional, cases, spins can sometimes form highly nontrivial structures called spin textures. Among them is the unusual, topologically stable skyrmion spin texture, in which the spins point in all the directions wrapping a sphere. The skyrmion configuration in a magnetic solid is anticipated to produce unconventional spin-electronic phenomena such as the topological Hall effect. The crystallization of skyrmions as driven by thermal fluctuations has recently been confirmed in a narrow region of the temperature/magnetic field (T-B) phase diagram in neutron scattering studies of the three-dimensional helical magnets MnSi (ref. 17) and Fe(1-x)Co(x)Si (ref. 22). Here we report real-space imaging of a two-dimensional skyrmion lattice in a thin film of Fe(0.5)Co(0.5)Si using Lorentz transmission electron microscopy. With a magnetic field of 50-70 mT applied normal to the film, we observe skyrmions in the form of a hexagonal arrangement of swirling spin textures, with a lattice spacing of 90 nm. The related T-B phase diagram is found to be in good agreement with Monte Carlo simulations. In this two-dimensional case, the skyrmion crystal seems very stable and appears over a wide range of the phase diagram, including near zero temperature. Such a controlled nanometre-scale spin topology in a thin film may be useful in observing unconventional magneto-transport effects.
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            Observation of skyrmions in a multiferroic material.

            X. Yu, S Ishiwata, Y. Tokura … (2012)
            A magnetic skyrmion is a topologically stable particle-like object that appears as a vortex-like spin texture at the nanometer scale in a chiral-lattice magnet. Skyrmions have been observed in metallic materials, where they are controllable by electric currents. Here, we report the experimental discovery of magnetoelectric skyrmions in an insulating chiral-lattice magnet Cu(2)OSeO(3) through Lorentz transmission electron microscopy and magnetic susceptibility measurements. We find that the skyrmion can magnetically induce electric polarization. The observed magnetoelectric coupling may potentially enable the manipulation of the skyrmion by an external electric field without losses due to joule heating.
            Article 0 comments Cited 543 times – based on 0 reviews     Review now
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              Author and article information

              Journal
              Publication date Created: 12 July 2018
              Article
              ArXiV ID: 1807.04641
              SO-VID: 0ae7b6d2-27c7-416c-a296-8f0668d98b98
              License:

              http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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              Custom metadata
              Comments 5 pages, 6 figures, includes supplemental material
              Categories cond-mat.str-el cond-mat.mtrl-sci

              ScienceOpen disciplines: Condensed matter
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              ScienceOpen disciplines: Condensed matter

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