Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5017738
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Funding
- project ICEEL INTERCARNOT OPTICSWITCH
- Leading Foreign Research Institute Recruitment Program through the National Research Foundation (NRF) of Korea - Ministry of Education, Science and Technology (MEST) [2012K1A4A3053565]
- DGIST R&D program of the Ministry of Science, ICT and future Planning [17-BT-02]
- NRF - Ministry of Science, ICT and Future Planning of Korea (MSIP) [2015R1A2A1A05001698, 2015M3D1A1070465]
- Future Materials Discovery Program through the NRF - MSIP [2015M3D1A1070465]
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We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. The effective spin Hall angle measurement shows an enhancement of the spin Hall angle with the Tb concentration which suggests an additional SOT contribution from the rare earth Tb atoms. Published by AIP Publishing.
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