Thermal effects on transverse domain wall dynamics in magnetic nanowires

Abstract

Articles you may be interested inMagnetic imaging of the pinning mechanism of asymmetric transverse domain walls in ferromagnetic nanowires

Domain walls within domain walls in wide ferromagnetic strips

“…Possible origins for the symmetry breaking leading to incoherent precession of m DW in different parts of the DW could be edge effects, and/or quenched disorder, interacting with the DW [10,[14][15][16][17][18][19][20]; these may include dislocations, precipitates, grain boundaries, thickness fluctuations of the strip, etc. Here we explore the dynamics of extended DWs in wide CoPtCr PMA strips, with a Bloch wall equilibrium structure, using large-scale micromagnetic simulations with and without quenched disorder.…”

“…In order to account for the effect of quenched disorder, here assumed to originate from the polycrystalline structure of the strip [41], we construct grains using a Voronoi tessella- tion [14,15], with an average grain size of 11.9 nm [35]; see the inset of Fig. 2.…”

Adaptively time stepping the stochastic Landau-Lifshitz-Gilbert equation at nonzero temperature: Implementation and validation in MuMax3

“…II, we compare the results obtained from the full micromagnetic simulations with the diffusion constant D of approximately 310 nm 2 /ns predicted by the model introduced, and numerically validated in Ref. 68 using the RK12 solver with fixed time step. The results show that the standard errors s are larger than the difference between the obtained diffusion constants and the expected value.…”

“…In a last validation problem we investigate the thermal driven diffusion of transverse domain walls in a non-disordered permalloy nanowire 68 . We simulate a nanowire with cross-sectional dimensions of 100×10 nm 2 discretized in cells of 3.125 × 3.125 × 10nm 3 .…”

“…Similarly as in Ref. 68 we simulate a transverse domain wall for 100 ns and repeat this simulation with a large number of different random seeds. In Tab.…”