Temperature dependent skyrmion Hall angle in ferrimagnets*

Analogous to the Hall effect where electronic charges moving in the presence of a magnetic field acquire a transverse velocity, magnetic solitons with non-zero topological charges (i.e. skyrmions and chiral domains walls) exhibit the skyrmion Hall effect, which opens up new possibilities for manipulating the trajectories of these quasiparticles. The skyrmion Hall effect has been theoretically predicted to vanish for antiferromagnetic skyrmions because of the cancelation of opposite topological charges. We present a study of current driven domain wall dynamics in artificially ferrimagnetic multilayers: Ta(4 nm)/Pt (5 nm)/[Co (0.5 nm)/Gd (1 nm)/Pt(1 nm)]₁₀/Al (2 nm). The magnetic texture in different layers of the multilayer films are coherent and antiferromagnetically aligned. Here we experimentally investigate the current driven magnetization dynamics from room temperature down to temperatures below the compensation point at around 100 K.