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Dependence of domain-wall depinning threshold current on pinning profile

Lepadatu, S.; Vanhaverbeke, A.; Atkinson, D.; Allenspach, R.; Marrows, C.H.

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Authors

S. Lepadatu

A. Vanhaverbeke

R. Allenspach

C.H. Marrows



Abstract

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).

Citation

Lepadatu, S., Vanhaverbeke, A., Atkinson, D., Allenspach, R., & Marrows, C. (2009). Dependence of domain-wall depinning threshold current on pinning profile. Physical Review Letters, 102(12), Article 127203. https://doi.org/10.1103/physrevlett.102.127203

Journal Article Type Article
Publication Date Mar 26, 2009
Deposit Date Feb 3, 2012
Publicly Available Date Mar 29, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 102
Issue 12
Article Number 127203
DOI https://doi.org/10.1103/physrevlett.102.127203

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Copyright Statement
© 2009 American Physical Society





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