Kinetic small angle neutron scattering of the Skyrmion lattice in MnSi

Abstract

We report a kinetic small angle neutron scattering study of the skyrmion lattice (SL) in MnSi. Induced by an oscillatory tilting of the magnetic field direction, the elasticity and relaxation of the SL along the magnetic field direction have been measured with microsecond resolution. For the excitation frequency of 325 Hz the SL begins to track the tilting motion of the applied magnetic field under tilting angles exceeding ${\alpha }_c$ > 0.4°. Empirically the associated angular velocity of the tilting connects quantitatively with the critical charge carrier velocity of approx. 0.1mm/s under current driven spin transfer torques, for which the SL unpins. In addition, a pronounced temperature dependence of the skyrmion motion is attributed to the variation of the skyrmion stiffness. Taken together our study highlights the power of kinetic small angle neutron scattering as a new experimental tool to explore, in a rather general manner, the elasticity and impurity pinning of magnetic textures across a wide parameter space without parasitic signal interferences due to ohmic heating or Oersted magnetic fields.

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• Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
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Cited by in corpus (7)

• The 2020 Skyrmionics Roadmap
• Computing and Memory Technologies based on Magnetic Skyrmions
• Stabilization mechanisms of magnetic skyrmion crystal and multiple-$Q$ states based on momentum-resolved spin interactions
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Channeling Skyrmions: suppressing the skyrmion Hall effect in ferrimagnetic nanostripes
• A proposal for skyrmion-based diode-like device in antiferromagnetic nanostripe
• Optimization strategies and artefacts of time-involved small angle neutron scattering experiments