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Voltage-induced magnetization dynamics in CoFeB/MgO/CoFeB magnetic tunnel junctions
Katsuya Miura1,2, Shin Yabuuchi1, Masaki Yamada1
1Research and Development Group, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji-shi, Tokyo 185-8601, Japan.
Scientific Reports
|February 18, 2017
Summary
Voltage-controlled magnetic anisotropy (VCMA) induces magnetization dynamics in magnetic tunnel junctions (MTJs). Understanding coupled layer motion is key for low-power electronics, with initial angles influencing dynamics.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Magnetic tunnel junctions (MTJs) with CoFeB/MgO structures show promise for low-power information technology.
- Voltage-controlled magnetic anisotropy (VCMA) is a key mechanism for manipulating magnetization dynamics.
- Understanding the coupled magnetization motion in multi-layer MTJs is crucial for device applications.
Purpose of the Study:
- To investigate the magnetization dynamics of two magnetic layers in MTJs with differing magnetic easy axes (in-plane and perpendicular).
- To analyze the influence of initial magnetization angles on magnetization motion amplitude under VCMA.
- To elucidate the underlying physical mechanisms driving magnetization motion in such MTJs.
Main Methods:
- Experimental measurements of rectified voltage (Vrec) to quantify magnetization motion amplitude.
- Numerical simulations using the micromagnetic method based on the Landau-Lifshitz-Gilbert equation of motion.
- Analysis of MTJs with top layers exhibiting in-plane easy axis and bottom layers with perpendicular easy axis, both possessing perpendicular magnetic anisotropy.
Main Results:
- The amplitude of magnetization motion is dependent on the initial angles of magnetization relative to the VCMA direction.
- Numerical simulations confirm that VCMA and transferred angular momentum jointly induce magnetization motion in both layers, despite differing magnetic easy axes.
- The study demonstrates that magnetization dynamics can be controlled by manipulating initial angles.
Conclusions:
- The findings highlight the significant role of initial magnetization angles in VCMA-driven dynamics within MTJs.
- This research provides a foundation for developing voltage-controlled MTJs with perpendicular magnetic anisotropy.
- Controlling the initial angle between magnetization and VCMA direction is identified as a critical factor for future spintronic devices.
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