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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
Domain wall dynamics driven by spin transfer torque and the spin-orbit field.
Masamitsu Hayashi1, Yoshinobu Nakatani, Shunsuke Fukami
1National Institute for Materials Science, Tsukuba, Japan. hayashi.masamitsu@nims.go.jp
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 17, 2011
Summary
We investigated how in-plane magnetic fields affect domain wall motion in magnetic nanowires. Such fields can alter the threshold current for domain wall movement and influence sensitivity to other magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Perpendicularly magnetized nanowires are crucial for spintronic devices.
- Current-driven domain wall motion is a key phenomenon in magnetic memory and logic applications.
- Rashba-like spin-orbit coupling can induce effective in-plane magnetic fields in such systems.
Purpose of the Study:
- To investigate the influence of an in-plane magnetic field on current-driven domain wall dynamics.
- To understand how this field affects the threshold current for domain wall motion.
- To explore the role of non-adiabatic spin torque in counteracting these effects.
Main Methods:
- Analytical modeling of domain wall behavior.
- Micromagnetic simulations of ultrathin magnetic nanowires.
- One-dimensional domain wall model incorporating spin-orbit coupling effects.
Main Results:
- The presence of an in-plane magnetic field can either decrease or increase the threshold current for domain wall motion.
- The threshold current becomes asymmetric for positive and negative currents, depending on wall chirality.
- Domain wall motion exhibits increased sensitivity to out-of-plane magnetic fields.
- Large non-adiabatic spin torque can effectively counteract the influence of the in-plane field.
Conclusions:
- In-plane magnetic fields significantly modify current-driven domain wall dynamics in perpendicularly magnetized nanowires.
- Understanding these effects is crucial for designing and optimizing spintronic devices.
- Non-adiabatic spin torque offers a potential mechanism to control or overcome the impact of in-plane fields.
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