Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.49: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Spin Hall effect in the non-collinear antiferromagnets IrMn₃ and PtMn₃ — •James Taylor¹, Yong Pu¹, Jue Huang¹, Weifeng Zhang², Wei Han², See-Hun Yang², Claudia Felser³, and Stuart S.P. Parkin^1,2 — ¹Max Planck Institute for Microstructure Physics, D-06120 Halle, Germany — ²IBM Almaden Research Center, San Jose, California 95120, USA — ³Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Recent work has demonstrated a large spin Hall effect (SHE) in antiferromagnets (AFM); including the ability to tune SHE by changing the crystal structure, and hence internal AFM ordering, of the materials. The triangular arrangement of magnetic moments in a non-collinear AFM is associated with a chirality, which is predicted to give rise to a significant anomalous Hall effect. With both effects sharing a common origin in spin-orbit coupling, such chiral spin textures may also give rise to large SHE. In this work, we report progress towards measurement of the spin Hall angle (SHA) in the non-collinear AFMs IrMn₃ and PtMn₃. SHA was measured using the spin-torque ferromagnetic resonance technique, in AFM/Py (= Ni₈₁Fe₁₉) bilayers. Initial results show a facet dependence of the SHA (θ_SH) measured in IrMn₃. In (100) oriented IrMn₃, θ_SH = 0.2, but in the (111) orientation θ_SH = 0.12. Further measurements will extend to PtMn₃, which has been grown using DC magnetron sputtering, with composition confirmed by Rutherford back scattering and crystal structure investigated using X-ray diffraction. In future work we aim to elucidate the effect of chiral magnetic ordering on measured SHA.