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Dependence of domain-wall depinning threshold current on pinning profile.

Lepadatu, S. and Vanhaverbeke, A. and Atkinson, D. and Allenspach, R. and Marrows, C.H. (2009) 'Dependence of domain-wall depinning threshold current on pinning profile.', Physical review letters., 102 (12). p. 127203.


We have investigated the threshold current density required for depinning a domain wall from constrictions in NiFe nanowires, which give rise to pinning potentials of fixed amplitude but variable profile. We observed it to vary linearly with the angle of the triangular constriction. These results are reproduced using micromagnetic simulations including the adiabatic and nonadiabatic spin-torque terms. By curve-fitting the calculated variations to the experimental results, we obtain the nonadiabaticity parameter β=0.04(±0.005) and current spin polarization P=0.51(±0.02).

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Publisher statement:© 2009 American Physical Society
Record Created:28 Nov 2012 09:35
Last Modified:28 Nov 2012 10:39

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