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Magnetic Tweezers for the Measurement of Twist and Torque
Published on: May 19, 2014
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Current-induced magnetization switching using an electrically insulating spin-torque generator.
Hongyu An1, Takeo Ohno2,3, Yusuke Kanno1
1Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.
Science Advances
|March 7, 2018
Summary
Researchers demonstrate current-induced magnetization switching using an insulating material. This breakthrough utilizes oxidized platinum to generate spin-orbit torques, paving the way for energy-efficient, voltage-programmable spintronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Electrical Engineering
Background:
- Spin-orbit torques enable current-induced magnetization switching, crucial for advanced spintronic devices.
- These torques typically originate from spin-orbit coupling in heavy metals.
- Broken inversion symmetry in heterostructures, even with insulators, can generate spin-orbit torques.
Purpose of the Study:
- To demonstrate current-induced magnetization switching using an electrical insulator.
- To explore the potential of insulating metal oxides as sources of spin-orbit torques.
- To investigate voltage-controlled manipulation of spin-orbit torques in oxide systems.
Main Methods:
- Fabrication of a heterostructure with a ferrimagnetic layer sandwiched between insulating oxides, including oxidized platinum (Pt).
- Electrical characterization to observe current-induced magnetization switching.
- Investigation of voltage-driven oxygen migration to control spin-orbit torques.
Main Results:
- Successful demonstration of current-induced magnetization switching using an insulating Pt oxide layer.
- Oxidized Pt acts as an effective generator of spin-orbit torques for switching perpendicular magnetization.
- Spin-orbit torques generated from Pt oxide are electrically tunable via voltage-driven oxygen migration.
Conclusions:
- Insulating metal oxides, specifically Pt oxide, can effectively generate spin-orbit torques for magnetization switching.
- This approach enables electrical switching of perpendicular magnetization in oxide-based heterostructures.
- Voltage-programmable, energy-efficient spintronic devices can be developed using insulating oxide materials.
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