Fig. 6

Pulse-width dependence of the critical current density. a The topologically unwound fraction of the written metastable SkS-L after the application of 200 in-plane pulses, F(n = 200), with varying current density, j, and pulse width, t _p. The curves are fits to the power low with a fixed exponent, F(n = 200)~j ^3.4. The error bars are derived from the uncertainty about the measured ρ _yx values corresponding to ±0.4 nΩ cm. b Practical critical current density vs. pulse width. j _{c,n = 100} and j _{c,n = 200} denote the current density at which F(n = 100) and F(n = 200), respectively, are equal to 0.03 at a given pulse width. Black and red lines are fits to the power law, j _c,n  − j _c,n (t _p → ∞)~t _p ^–1/δ, with δ = 0.43. Measurements were performed at 15 K and 0.249 T