Analysis of current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy

Current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy is studied by using micromagnetic simulations, supported by a one-dimensional model of wall dynamics. The threshold current density of perpendicular anisotropy strips is much smaller than that of in-plane anisotropy strips, and is almost independent of the pinning potential strength. This results from the narrower domain wall width, smaller hard-axis anisotropy, and the larger ratio of the depinning field and hard-axis anisotropy. In the one-dimensional model with a zero damping constant, the threshold current density is found to be about 0.72 of the intrinsic threshold current density for a perfect strip in a strong pinning regime that corresponds to strips with perpendicular magnetic anisotropy. The fact that the threshold current density from the pinning sites is smaller than the intrinsic current density is because the effective field, equivalent to the pinning potential, enhances a breakdown in t...

[1]  Guido Meier,et al.  Direct imaging of stochastic domain-wall motion driven by nanosecond current pulses. , 2007, Physical review letters.

[2]  C. Krafft,et al.  Spin-current-induced magnetization reversal in magnetic nanowires with constrictions , 2005 .

[3]  Y. Nakatani,et al.  Threshold Current of Domain Wall Motion under Extrinsic Pinning, β-Term and Non-Adiabaticity(Condensed matter: electronic structure and electrical, magnetic, and optical properties) , 2006 .

[4]  D Petit,et al.  Magnetic Domain-Wall Logic , 2005, Science.

[5]  S. Nasu,et al.  Real-space observation of current-driven domain wall motion in submicron magnetic wires. , 2003, Physical review letters.

[6]  Ken Harada,et al.  Current-Excited Magnetization Dynamics in Narrow Ferromagnetic Wires , 2006, cond-mat/0606547.

[7]  Stuart S. P. Parkin,et al.  Oscillatory dependence of current-driven magnetic domain wall motion on current pulse length , 2006, Nature.

[8]  Y Suzuki,et al.  Micromagnetic understanding of current-driven domain wall motion in patterned nanowires , 2005 .

[9]  N. Sakimura,et al.  MRAM Cell Technology for Over 500-MHz SoC , 2007, IEEE Journal of Solid-State Circuits.

[10]  Y. Nakatani,et al.  Domain wall motion by spin-polarized current: a micromagnetic study , 2004 .

[11]  S. Zhang,et al.  Domain-wall dynamics driven by adiabatic spin-transfer torques , 2004, math-ph/0407064.

[12]  Russell P. Cowburn,et al.  Domain wall propagation in magnetic nanowires by spin-polarized current injection , 2003 .

[13]  Shunsuke Fukami,et al.  Micromagnetic analysis of current driven domain wall motion in nanostrips with perpendicular magnetic anisotropy , 2008 .

[14]  J. Ferré,et al.  Domain wall mobility, stability and Walker breakdown in magnetic nanowires , 2007, cond-mat/0702492.

[15]  Eric E. Fullerton,et al.  Threshold currents to move domain walls in films with perpendicular anisotropy , 2007 .

[16]  G. Faini,et al.  Switching a spin valve back and forth by current-induced domain wall motion , 2003 .

[17]  L. Berger,et al.  Exchange interaction between ferromagnetic domain wall and electric current in very thin metallic films , 1984 .

[18]  J A C Bland,et al.  Direct observation of domain-wall configurations transformed by spin currents. , 2005, Physical review letters.

[19]  M Yamanouchi,et al.  Velocity of domain-wall motion induced by electrical current in the ferromagnetic semiconductor (Ga,Mn)As. , 2006, Physical review letters.

[20]  Mathias Kläui,et al.  Current-induced vortex nucleation and annihilation in vortex domain walls , 2006 .

[21]  Luc Thomas,et al.  Dependence of current and field driven depinning of domain walls on their structure and chirality in permalloy nanowires. , 2006, Physical review letters.

[22]  G. Tatara,et al.  Theory of current-driven domain wall motion: spin transfer versus momentum transfer. , 2004, Physical review letters.