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Spin-orbit torques associated with ferrimagnetic order in Pt/GdFeCo/MgO layers
JongHyuk Kim1,2, DongJoon Lee1,3, Kyung-Jin Lee3,4
1Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, Korea.
Scientific Reports
|April 18, 2018
Summary
Spin orbit torque (SOT) efficiencies in Pt/GdFeCo/MgO multilayers differ from conventional ferromagnets due to ferrimagnetism. New models are needed to explain spin dynamics in these heavy-metal/ferrimagnet systems.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Spin orbit torque (SOT) is crucial for next-generation magnetic memory devices.
- Understanding SOT in novel magnetic materials like ferrimagnets is essential for device optimization.
- Pt/GdFeCo/MgO multilayers offer a unique system to study SOT effects.
Purpose of the Study:
- To investigate spin orbit torque (SOT) efficiencies in Pt/GdFeCo/MgO multilayers.
- To explore the influence of GdFeCo and MgO layer thicknesses on magnetic properties.
- To compare SOT behavior in heavy-metal/ferrimagnet systems with heavy-metal/ferromagnet systems.
Main Methods:
- Fabrication of Pt/GdFeCo/MgO multilayers with varying layer thicknesses.
- Characterization of magnetic properties and SOT efficiencies.
- Analysis of experimental data using theoretical models.
Main Results:
- Ferrimagnetism in GdFeCo is thickness-dependent due to Gd diffusion into MgO.
- Pt/GdFeCo/MgO exhibits lower SOT efficiencies compared to conventional ferromagnets.
- Existing models for ferromagnets are inadequate for analyzing heavy-metal/ferrimagnet systems.
Conclusions:
- Heavy-metal/ferrimagnet systems possess distinct magnetic dynamical modes, spin angular momentum transfer, and relaxation processes.
- The findings necessitate the development of new theoretical frameworks for ferrimagnetic spintronic devices.
- This research highlights the unique characteristics of ferrimagnetic materials in spintronic applications.
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