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Unattenuated conical spin wave in spiral magnet: The role of Dzyaloshinskii-Moriya interaction
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10.1063/1.3631827
/content/aip/journal/jap/110/5/10.1063/1.3631827
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/5/10.1063/1.3631827
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Figures

Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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).

Image of FIG. 3.
FIG. 3.

(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 .

Image of FIG. 4.
FIG. 4.

(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.

Image of FIG. 5.
FIG. 5.

(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.

Image of FIG. 6.
FIG. 6.

(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.

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/content/aip/journal/jap/110/5/10.1063/1.3631827
2011-09-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unattenuated conical spin wave in spiral magnet: The role of Dzyaloshinskii-Moriya interaction
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/5/10.1063/1.3631827
10.1063/1.3631827
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