Publications by authors named "Xiaobai Ning"
We propose a general theory of charge, spin, and orbital diffusion based on Keldysh formalism. Our findings indicate that the diffusivity of orbital angular momentum in metals is much lower than that of spin or charge due to the strong orbital intermixing in crystals. Furthermore, our theory introduces the concept of "spin-orbit polarization" by which a pure orbital (spin) current induces a longitudinal spin (orbital) current, a process as efficient as spin polarization in ferromagnets.
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- Spin-orbit torque magnetic random access memory (SOT-MRAM) offers high write speeds and low power usage, with Mo potentially improving the performance of CoFeB/MgO MRAM cells.
- Despite its weaker spin-orbit coupling, our study shows that amorphous Mo achieves notable SOT efficiencies, specifically a damping-like efficiency of 0.015 and a field-like efficiency of 0.050.
- The findings suggest that Mo can effectively serve as both an SOT source and a buffer layer for perpendicular magnetic anisotropy, presenting new opportunities for SOT-MRAM development.