(Color online) (a) A schematic drawing of a metal/spiral magnet/metal heterostructure. Layer I: metal layer with an injected spin-polarized electron current flowing along the layer horizontal. Layer II: spiral magnet layer, in which a spin wave is developed by the spin transfer torque between layer I and layer II through the interface. Layer III: metal layer where the conduction electron current is polarized through the spin pumping from layer II. (b) Spin configurations of a spiral magnet and a Bloch domain wall.
(Color online) (a) Three components of S n at time t, taking spins between 40 ≤ n ≤ 60 in the chain. Dashed lines show the fitting results of S n . (b) Spatial trajectory of spins in (a). (c) Time-dependence of the three components of S n . (d) Spatial trajectory of spins in (c).
(Color online) (a) Sketched graph for an unattenuated conical spin wave driven by a spin-polarized current S 0. (b) Spins in the chain form a cone with the cone point at (0, 0, 0), the cone origin at (0, −c n , c n ), and the radius of underside circle R n . The angle between the two nearest-neighboring spins (S n and S n+1) is defined as θ n , while the projection of θ n on the underside of the cone is ϕ n .
(Color online) Numerically and analytically derived parameters of the unattentuated conical spin wave. The critical region is marked with yellow shadow. (a) Spin precession frequency ω as a function of s 0. (b) R n as a function of D, with J = 1 k BK, s 0 = 50 Oe. (c) R n as a function of s 0, with J = 0.8 k BK, D = 1 k BK. (d) k as a function of D, with J = 1 k BK, s 0 = 50 Oe.
(Color online) Phase diagrams for parameter R 0 (a) in the (J, D) space with s 0 = 100 Oe. The critical values for D are labeled as red open circles, and (b) in the (D, s 0) space with J = 1.0 k BK. The critical values for s 0 are labeled as red open squares.
(Color online) (a) Calculated parameter ξ n (t) as a function of time t at α = 0.001, 0.005, and 0.01. (b) Numerically and analytically derived oscillating amplitude of ξ n (t) as a function of α. (c) Calculated D as a function of J for the critical point (R 0 = 0) at α = 0.001, 0.005, and 0.01. The analytical results (Ana) are independent of α while the numerical results are slightly α-dependent.
Article metrics loading...
Full text loading...