We present a detailed study of the photoinduced magnetization precession and magnetic relaxation in epitaxial Pd/Fe films on MgO(0 0 1) substrates via all-optical pump-probe techniques. We explicitly formulate the correlation between the Gilbert damping and the effective damping in the optical approach. Furthermore, a non-local Gilbert damping induced by spin pumping is demonstrated self-consistently by the Gilbert damping dependence on Pd thickness and the 1/d Fe relationship of damping with Fe thickness d Fe . The non-local Gilbert damping enables the determination of spin diffusion length λ SD = (7.4 ± 3.0) nm in Pd and interfacial spin mixing conductance g ↑↓ = (2.7 ± 0.4) × 10 19 m −2 . Our work paves the way toward the optical determination of spin transport parameters.
Channel crosstalk is one important feature of multi-core fiber communication based on space division multiplexing technology, which could affect the signal quality and transmission distance of the broadband fiber ampli• fication system. This paper is focused on the crosstalk problems of a 19-core weak coupling optical fiber, as that can benefit much to develop high-volume communicating fiber based on fiber extrusion technology. Then, the optical cou• pling theory and finite element method are adopted to complete the numerical simulation of fiber performance, here, key parameters of groove size, core refractive index distribution and their influence on the crosstalk of the fiber are optimized wholly. The simulation results show that the optimized fiber has a low crosstalk of -156 dB/100 m at 1 550 nm, which could meet the requirements of future long-distance high-capacity optical fiber communication.
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