Reversal of skyrmion topological deflection across the angular compensation in GdCo ferrimagnetic thin-film - Laboratoire de Physique des Solides d'Orsay Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Reversal of skyrmion topological deflection across the angular compensation in GdCo ferrimagnetic thin-film

Léo Berges
Eloi Haltz
Sujit Panigrahy
Sougata Mallick
Raphaël Weil
Stanislas Rohart
Alexandra Mougin
Joao Sampaio

Résumé

Magnetic skyrmions are topologically non-trivial swirling magnetic textures. Their particle-like properties and defined chirality imposed by chiral interaction such as the Dzyaloshinskii-Moriya interaction, enables their efficient manipulation by spin-polarized currents. They have been well described in ferromagnetic materials [1], where they display a large sideways deflection proportional to the material’s angular momentum density Ls [2], which is detrimental to most applications. Rare Earth/Transition Metal (RE/TM) ferrimagnets, such as GdCo, offer promising properties to tackle this issue. Indeed, the different nature of the two antiferromagnetically-coupled magnetic sub-lattices allows to tailor the Ls of the material by changing either its temperature or composition. In particular, it is even possible to change the sign of the net Ls across the angle compensation point which is predicted to reverse the skyrmion deflection angle. It has been shown that deflection of domains with chiral domain walls reverses when crossing the compensation temperature [3] and that skyrmion deflection is reduced near compensation temperature relative to that observed in ferromagnets [4]. We present clear evidence of the reversal of the topological deflection angle of skyrmions in GdCo across the compensation composition. We produced two thin-film samples on either side of the compensation composition, with a small out of plane anisotropy to stabilize skyrmions . The skyrmions' positions before and after current pulses, propagated by current-induced spin-orbit torques, are measured by magneto-optical imaging, and clearly show that the deflection angle in the two samples is of opposite sign . This result shows unambiguously how the skyrmion topological deflection can be tuned and suppressed in RETM ferrimagnets and paves the way towards deflectionless skyrmions at room temperature and zero magnetic field. [1] C. H. Marrows, K. Zeissler, Appl. Phys. Lett. 119, 250502 (2021) [2] Jiang, W., Zhang, X., Yu, G. et al., Nature Phys 13, 162–169 (2017) [3] Hirata, Y., Kim, DH., Kim, S.K. et al., Nat. Nanotechnol. 14, 232–236 (2019) [4] Woo, S., Song, K.M., Zhang, X. et al., Nat Commun 9, 959 (2018)
Fichier non déposé

Dates et versions

hal-04295863 , version 1 (20-11-2023)

Identifiants

  • HAL Id : hal-04295863 , version 1

Citer

Léo Berges, Eloi Haltz, Sujit Panigrahy, Sougata Mallick, Raphaël Weil, et al.. Reversal of skyrmion topological deflection across the angular compensation in GdCo ferrimagnetic thin-film. Magnetism and Magnetic Materials, Oct 2022, Minneapolis, United States. ⟨hal-04295863⟩
16 Consultations
0 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More