Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling
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- Soong-Geun Je
- SPINTEC, University Grenoble Alpes 1 , CEA, CNRS, Grenoble INP, INAC-Spintec, 38000 Grenoble, France
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- Juan-Carlos Rojas-Sánchez
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Thai Ha Pham
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Pierre Vallobra
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Gregory Malinowski
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Daniel Lacour
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Thibaud Fache
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Marie-Claire Cyrille
- CEA 3 , LETI, MINATEC Campus, F-38054 Grenoble, France
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- Dae-Yun Kim
- Department of Physics and Institute of Applied Physics, Seoul National University 4 , Seoul 08826, South Korea
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- Sug-Bong Choe
- Department of Physics and Institute of Applied Physics, Seoul National University 4 , Seoul 08826, South Korea
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- Mohamed Belmeguenai
- LSPM (CNRS-UPR 3407), Université Paris 13 5 , Sorbonne Paris Cité, 99 avenue Jean-Baptiste Clément, 93430 Villetaneuse, France
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- Michel Hehn
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Stéphane Mangin
- Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine 2 , 54506 Vandoeuvre lès Nancy, France
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- Gilles Gaudin
- SPINTEC, University Grenoble Alpes 1 , CEA, CNRS, Grenoble INP, INAC-Spintec, 38000 Grenoble, France
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- Olivier Boulle
- SPINTEC, University Grenoble Alpes 1 , CEA, CNRS, Grenoble INP, INAC-Spintec, 38000 Grenoble, France
抄録
<jats:p>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.</jats:p>
収録刊行物
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- Applied Physics Letters
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Applied Physics Letters 112 (6), 062401-, 2018-02-05
AIP Publishing