Temperature and stress effects on viscous damping parameter β of magnetic domain wall dynamics

Viscous damping parameter, β, and propatation field, Hp, have been measured in Metglas 2826 ribbons under stress (from σ = 103 MPa to σ = 365 MPa) at different temperatures (from t = 25 °C to t = 200 °C) Results show that propagation field depends on domain wall energy, γ, at constant temperature. Viscous damping, β = βE+ βR, (being βRrelaxation damping and βEeddy current damping) depends on domain wall thickness, δ, and on parameter (μoMs)²/ρ (ρ resistivity, μoMssaturation magnetization) through βRand βErespectively.