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Spin-orbit torque in a bulk perpendicular magnetic anisotropy Pd/FePd/MgO system
Hwang-Rae Lee1, Kyujoon Lee2, Jaehun Cho1
1Department of Physics, Inha University, Incheon 402-751, Korea.
Scientific Reports
|October 9, 2014
Summary
Spin-orbit torques (SOT) in bulk perpendicular magnetic anisotropy Pd/FePd/MgO systems were significantly larger than interfacial SOT. This suggests SOT may not solely originate from interfaces in these materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spin-orbit torques (SOT) are crucial for spintronic devices.
- SOT is typically studied at interfaces between heavy metals and ferromagnets.
- Previous research focused on ultra-thin ferromagnetic layers with interface perpendicular magnetic anisotropy.
Purpose of the Study:
- Investigate SOT in bulk perpendicular magnetic anisotropy (PMA) systems.
- Determine the origin of SOT in Pd/FePd/MgO structures.
- Quantify effective fields in these bulk PMA systems.
Main Methods:
- Utilized harmonic methods for precise measurements.
- Employed careful correction procedures to ensure accuracy.
- Studied Pd/FePd (1.54-2.43 nm)/MgO systems with varying FePd thicknesses.
Main Results:
- Measured effective longitudinal and transverse fields in bulk PMA Pd/FePd/MgO.
- Observed effective fields 5-10 times larger than in interface PMA systems.
- Found a thickness dependence in the effective fields.
Conclusions:
- SOT in these bulk PMA systems are significantly larger than interfacial SOT.
- The observed magnitude and thickness dependence suggest SOT do not have a purely interfacial origin.
- This challenges the conventional understanding of SOT origins.
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