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Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
Kim, Kyoung-Whan,Lee, Kyung-Jin,Sinova, Jairo,Lee, Hyun-Woo,Stiles, M. D. American Physical Society 2017 Physical review. B Vol.96 No.10
<P>We use a perturbative approach to study the effects of interfacial spin-orbit coupling in magnetic multilayers by treating the two-dimensional Rashba model in a fully three-dimensional description of electron transport near an interface. This formalism provides a compact analytic expression for current-induced spin-orbit torques in terms of unperturbed scattering coefficients, allowing computation of spin-orbit torques for various contexts, by simply substituting scattering coefficients into the formulas. It applies to calculations of spin-orbit torques for magnetic bilayers with bulk magnetism, those with interface magnetism, a normal-metal/ferromagnetic insulator junction, and a topological insulator/ferromagnet junction. It predicts a damping like component of spin-orbit torque that is distinct from any intrinsic contribution or those that arise from particular spin relaxation mechanisms. We discuss the effects of proximity-induced magnetism and insertion of an additional layer and provide formulas for in-plane current, which is induced by a perpendicular bias, anisotropic magnetoresistance, and spin memory loss in the same formalism.</P>
Stag beetle fauna of Cambodia (Coleoptera: Lucanidae)
Maquart Pierre-Olivier,Yamamoto Shûhei,Sopha Sin,Chhorn Soksan,Phak Satha,Sinovas Pablo,Phauk Sophany,Boyer Sébastien 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
To date, no species catalogue of stag beetles (Lucanidae) has been compiled for Cambodia. According to the available literature, we assembled the checklist based on the previously recorded and recognized Cambodian lucanid species in the country. In the present paper, we newly record four species from Cambodia: Falcicornis axisopsis (Séguy, 1954); Neolucanus similis Bomans & Ratti, 1976; Prosopocoilus suturalis (Olivier, 1789); and Prosopocoilus jenkinsi (Westwood, 1848). An updated checklist of the Cambodian stag beetles is given. The total number of the Cambodian lucanid species has now reached 29, but this species count is considerably less diverse than those in neighboring countries. Our study suggested that this poor diversity is not primarily due to biogeography or small country size but to a lack of research effort.