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First-principles investigation of the electronic, elastic and thermodynamic properties of VC under high pressure 下载免费PDF全文
An investigation of the electronic,elastic and thermodynamic properties of VC under high pressure has been conducted using first-principles calculations based on density functional theory (DFT) with the plane-wave basis set,as implemented in the CASTEP code. At elevated pressures,VC is predicted to undergo a structural transition from a relatively open NaCl-type structure to a more dense CsCl-type one. The predicted transition pressure is 520 GPa. The elastic constant,Debye temperature and heat capacity each as a function of pressure and/or temperature of VC are presented for the first time. 相似文献
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本文论述了数学教育与素质教育的关系及数学教学对素质教育的重要作用,探讨了通过数学教学改革促进素质教育的方法。 相似文献
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Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers 下载免费PDF全文
Wenqiang Wang 《中国物理 B》2022,31(9):97504-097504
We study inserting Co layer thickness-dependent spin transport and spin-orbit torques (SOTs) in the Pt/Co/Py trilayers by spin-torque ferromagnetic resonance. The interfacial perpendicular magnetic anisotropy (IPMA) energy density ($K_{\rm s}= 2.7 $ erg/cm$^{2}$, 1 erg = 10$^{-7}$ J), which is dominated by interfacial spin-orbit coupling (ISOC) in the Pt/Co interface, total effective spin-mixing conductance $(G_{\mathrm{eff,tot}}^{\mathrm{\uparrow \downarrow }}=\mathrm{0.42\times }{10}^{15} \mathrm{\Omega }^{-1}\cdot\mathrm{m}^{-2}$) and two-magnon scattering ($\beta_{\mathrm{TMS}}= 0.46 {\mathrm{nm}}^{2}$) are first characterized, and the damping-like torque ($\xi_{\mathrm{DL}}= 0.103$) and field-like torque ($\xi _{\mathrm{FL}}=-0.017$) efficiencies are also calculated quantitatively by varying the thickness of the inserting Co layer. The significant enhancement of $\xi_{\mathrm{DL}}$ and $\xi_{\mathrm{FL}}$ in Pt/Co/Py than Pt/Py bilayer system originates from the interfacial Rashba-Edelstein effect due to the strong ISOC between Co-3d and Pt-5d orbitals at the Pt/Co interface. Additionally, we find a considerable out-of-plane spin polarization SOT, which is ascribed to the spin anomalous Hall effect and possible spin precession effect due to IPMA-induced perpendicular magnetization at the Pt/Co interface. Our results demonstrate that the ISOC of the Pt/Co interface plays a vital role in spin transport and SOTs-generation. Our finds offer an alternative approach to improve the conventional SOTs efficiencies and generate unconventional SOTs with out-of-plane spin polarization to develop low power Pt-based spintronic via tailoring the Pt/FM interface. 相似文献
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首先建立了具有免疫反应参与的乙型肝炎病毒感染动力学新模型,利用Routh-Hurwitz判据,获得了正平衡点的局部渐近稳定的充分条件.其次建立了具有免疫时滞的数学模型,证明了随着时滞的增加,系统的稳定开关将会发生. 相似文献
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用机械合金化方法制备了不同成分的Fe-Si合金.其晶粒具有α-Fe结构,粒径为十几到几十纳米,且晶格存在严重畸变.它们的饱和磁化强度σs与Si含量近似成线性关系,只是稍小于相应的单晶和多晶Fe-Si合金,而其矫顽力Hc和有效各向异性常数Keff却远大于相应的单晶和多晶Fe-Si合金.它们的磁谱除Fe75Si25外都是弛豫型的,其磁导率的大小与相应的铁氧体复合材料差不多.在它们的磁化过程中,畴壁位移
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