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Stuart Parkin1

1, Max Plank Institute for Microstructure Physics, Munich, , Germany

Over the past few years there have been remarkable discoveries in spin-based phenomena that rely on spin-orbit coupling that could spur the development of advanced magnetic memory devices1-3. These include the formation of chiral spin textures in the form of NĂ©el domain walls and topological spin textures, skyrmions, that are stabilized by a Dzyaloshinskii-Moriya exchange interaction. The Dzyaloshinskii-Moriya exchange interaction is derived from broken symmetries and spin-orbit interactions at interfaces or within the bulk of materials. Recently magnetic antiskyrmions have been discovered in a tetragonal Heusler compound using Lorentz transmission electron microscopy. The antiskyrmion are stable over a wide range of temperature and magnetic field4. We show that the anti-skyrmions become more stable as the thickness of the slab in which the antiskyrmions are imaged is increased. We compare the properties of antiskyrmions with those of skyrmions and chiral domain walls and their possible use in Racetrack Memory2,3.
1 Parkin, S. S. P. & Yang, S.-H. Memory on the Racetrack. Nat. Nano. 10, 195-198, (2015).
2 Yang, S.-H., Ryu, K.-S. & Parkin, S. S. P. Domain-wall velocities of up to 750?ms?1 driven by exchange-coupling torque in synthetic antiferromagnets. Nat. Nano. 10, 221-226, (2015).
3 Garg, C., Yang, S.-H., Phung, T., Pushp, A. & S.P.Parkin, S. Dramatic influence of curvature of nanowire on chiral domain wall velocity. Sci. Adv. 3, e1602804, (2017).
4 Nayak, A. K. et al. Discovery of Magnetic Antiskyrmions Beyond Room Temperature in Tetragonal Heusler Materials. arXiv:1703.01017 (2017).

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