Dynamic stiffness of spin valves

Dynamic stiffness of spin valves

The dynamics of the magnetic order parameters of ferromagnet/paramagnet/ferromagnet spin valves and isolated ferromagnets may be very different. We investigate the role of the nonequilibrium spin-current exchange between the ferromagnets in the magnetization precession and switching. We find a ~low-temperature! critical current bias for a uniform current-induced magnetization excitation in spin...

Spin conductance, dynamic spin stiffness and spin diffusion in itinerant magnets

We discuss analogies between the chargeand spin response functions of itinerant magnets. We show that the spin-analog of the charge stiffness is not given by the usual spin stiffness ρs, but by the dynamic spin stiffness Ds, which is obtained from the dynamic spin conductance Gs(ω) in the limit of vanishing frequency ω. The low-frequency behavior of Gs(ω) is used to define ideal spin conductors...

Spin stiffness of vector spin glasses

a r t i c l e i n f o a b s t r a c t We study domain-wall excitations for O(m) vector spin glasses in the limit m → ∞, where the energy landscape is simplified considerably compared to X Y or Heisenberg models due to the complete disappearance of metastability. Using numerical ground-state calculations and appropriate pairs of complementary boundary conditions, domain-wall defects are inserted...

The Prediction of Dynamic Strain in Leaf-Type Compressor Valves With Variable Mass and Stiffness

dynamic coloring of graph

در این پایان نامه رنگ آمیزی دینامیکی یک گراف را بیان و مطالعه می کنیم. یک –kرنگ آمیزی سره ی رأسی گراف g را رنگ آمیزی دینامیکی می نامند اگر در همسایه های هر رأس v?v(g) با درجه ی حداقل 2، حداقل 2 رنگ متفاوت ظاهر شوند. کوچکترین عدد صحیح k، به طوری که g دارای –kرنگ آمیزی دینامیکی باشد را عدد رنگی دینامیکی g می نامند و آنرا با نماد ?_2 (g) نمایش می دهند. مونت گمری حدس زده است که تمام گراف های منتظم ...