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Thin Films
摘要： We demonstrate how to extract the material-dependent spin-torque efficiency (ξ) and asymmetry (λ) from the field-current nucleation boundaries of magnetic droplet solitons in orthogonal nano-contact spin-torque oscillators with Cox(Ni80Fe20)1?x, (x = 0 ? 1), fixed layers. As the perpendicular component of the fixed-layer magnetization plays a central role in governing droplet nucleation, the nucleation boundaries exhibit monotonic shifts towards higher perpendicular magnetic fields when the fixed-layer magnetization μ0Ms,p is tuned from 1.04 to 1.7 T. We then extract ξ and λ from fits to the nucleation boundaries and find that while ξ does not vary with composition, λ increases from 1.5 to 3 with increasing Co content. The analysis of droplet nucleation boundaries is hence a useful tool for the systematic study of both ξ and λ as functions of material composition.
关键词： Cox(Ni80Fe20)1?x,magnetic droplet solitons,spin-torque asymmetry,spin-torque efficiency,nano-contact spin-torque oscillators
更新于2025-09-23 15:21:21
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Light sprinkler
摘要： Although high rotation rates have been achieved with optically driven micro-rotors, particularly in low-viscosity fluids or with small rotor sizes to minimize drag, the demonstrated torque efficiency is typically small in practice compared with theoretical maxima. Now, Silvio Bianchi and colleagues in Italy and Hungary have demonstrated that with precise rerouting of light in 3D structures fabricated by direct laser writing, optical micro-turbines can better harness light’s momentum and efficiently generate uniform and controllable torque.
关键词： light sprinkler,direct laser writing,torque efficiency,optical micro-turbines,micro-optics
更新于2025-09-23 15:21:01