Neutron study of in-plane skyrmions in MnSi thin films

Meynell, S. A.; Wilson, M. N.; Krycka, Kathryn; Kirby, Brian J.; Fritzsche, H.; Monchesky, T. L.

doi:10.1103/physrevb.96.054402

Cited by 34 publications

(27 citation statements)

References 51 publications

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“…Quantitatively, its value is difficult to account for within current theoretical models of skyrmion THE. Finally, a similar controversy occurred before for MnSi thin films in which there are skyrmions when the magnetic field is applied in-plane but not when it is applied perpendicular to the film 48 – 50 . Thus, there is still no consensus on skyrmion THE in FeGe thin films and no report of skyrmion THE in bulk FeGe crystals.…”

Section: Introductionmentioning

confidence: 65%

Skyrmion Lattice Topological Hall Effect near Room Temperature

Leroux

Stolt

Jin

et al. 2018

Sci Rep

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Magnetic skyrmions are stable nanosized spin structures that can be displaced at low electrical current densities. Because of these properties, they have been proposed as building blocks of future electronic devices with unprecedentedly high information density and low energy consumption. The electrical detection of an ordered skyrmion lattice via the Topological Hall Effect (THE) in a bulk crystal, has so far been demonstrated only at cryogenic temperatures in the MnSi family of compounds. Here, we report the observation of a skyrmion lattice Topological Hall Effect near room temperature (276 K) in a mesoscopic lamella carved from a bulk crystal of FeGe. This region coincides with the skyrmion lattice location revealed by neutron scattering. We provide clear evidence of a re-entrant helicoid magnetic phase adjacent to the skyrmion phase, and discuss the large THE amplitude (5 nΩ.cm) in view of the ordinary Hall Effect.

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Section: Introductionmentioning

confidence: 65%

Skyrmion Lattice Topological Hall Effect near Room Temperature

Leroux

Stolt

Jin

et al. 2018

Sci Rep

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“…(iv) The destabilization of competing phases (Seki et al, 2012c;Yu et al, 2011Yu et al, , 2010, (v) strain (Fobes et al, 2017;Nii et al, 2015) and (vi) terms induced by free surfaces (Rybakov et al, 2015) and interface spin orbit effects (Heinze et al, 2011;Romming et al, 2013) play an important role, in particular with decreasing sample thickness. Here, SANS, GISANS and polarized neutron reflectometry (PNR) have been used to study the possible formation of skyrmionic structures in B20 thin films: While such textures have been claimed to exist in MnSi thin films (Karhu et al, 2012;Meynell et al, 2017;Wilson et al, 2013), based on magnetization and PNR and SANS measurements, recent GISANS studies (Wiedenmann et al, 2017) did not reveal any hints for SKL spin textures in thin epitaxial films of MnSi.…”

Section: The Concept Of Skyrmionsmentioning

confidence: 98%

Magnetic small-angle neutron scattering

et al. 2019

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Small-angle neutron scattering (SANS) is one of the most important techniques for microstructure determination, being utilized in a wide range of scientific disciplines, such as materials science, physics, chemistry, and biology. The reason for its great significance is that conventional SANS is probably the only method capable of probing structural inhomogeneities in the bulk of materials on a mesoscopic real-space length scale, from roughly 1 − 300 nm. Moreover, the exploitation of the spin degree of freedom of the neutron provides SANS with a unique sensitivity to study magnetism and magnetic materials at the nanoscale. As such, magnetic SANS ideally complements more real-space and surface-sensitive magnetic imaging techniques, e.g., Lorentz transmission electron microscopy, electron holography, magnetic force microscopy, Kerr microscopy, or spinpolarized scanning tunneling microscopy. In this review article we summarize the recent applications of the SANS method to study magnetism and magnetic materials. This includes a wide range of materials classes, from nanomagnetic systems such as soft magnetic Fe-based nanocomposites, hard magnetic Nd−Fe−B-based permanent magnets, magnetic steels, ferrofluids, nanoparticles, and magnetic oxides, to more fundamental open issues in contemporary condensed matter physics such as skyrmion crystals, noncollinar magnetic structures in noncentrosymmetric compounds, magnetic/electronic phase separation, and vortex lattices in type-II superconductors. Special attention is paid not only to the vast variety of magnetic materials and problems where SANS has provided direct insight, but also to the enormous progress made regarding the micromagnetic simulation of magnetic neutron scattering.

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“…10 The formation of skyrmions has also been reported in epitaxially thin films of these bulk systems, as well as nanowhiskers and nanoparticles. 11,12 Further, tailored magnetic bubbles featuring skyrmion characteristics have been detected in a wide range of heterostructures 13,14 , as well as in carefully selected atomically thin films. 15 While the microscopic interactions across this exceptionally wide range of materials are inherently different, all of the known systems were believed to exhibit a single temperature and field regime of the skyrmion lattice order.…”

Section: Introductionmentioning

confidence: 95%