Non-Uniform Switching of the Perpendicular Magnetization in a Spin-Torque Magnetic Nanopillar

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Time-resolved scanning transmission x-ray microscopy (STXM) measurements were performed to study the current-induced magnetization switching mechanism in nanopillars exhibiting strong perpendicular magnetic anisotropy (PMA). This technique provides both short time (70 ps) and high spatial (25 nm) resolution. Direct imaging of the magnetization demonstrates that, after an incubation time of {approx} 1.3 ns, a 100 x 300 nm{sup 2} ellipsoidal device switches in {approx} 1 ns via a central domain nucleation and opposite propagation of two domain walls towards the edges. High domain wall velocities on the order of 100m/s are measured. Micromagnetic simulations are shown to be in good ... continued below

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Bernstein, David June 1, 2011.

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Time-resolved scanning transmission x-ray microscopy (STXM) measurements were performed to study the current-induced magnetization switching mechanism in nanopillars exhibiting strong perpendicular magnetic anisotropy (PMA). This technique provides both short time (70 ps) and high spatial (25 nm) resolution. Direct imaging of the magnetization demonstrates that, after an incubation time of {approx} 1.3 ns, a 100 x 300 nm{sup 2} ellipsoidal device switches in {approx} 1 ns via a central domain nucleation and opposite propagation of two domain walls towards the edges. High domain wall velocities on the order of 100m/s are measured. Micromagnetic simulations are shown to be in good agreement with experimental results and provide insight into magnetization dynamics during the incubation and reversal period.

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  • Journal Name: Submitted to Physical Review B; Journal Volume: 83; Journal Issue: 18

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  • Report No.: SLAC-PUB-14453
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevB.83.180410 | External Link
  • Office of Scientific & Technical Information Report Number: 1015614
  • Archival Resource Key: ark:/67531/metadc830096

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  • June 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 7, 2016, 6:21 p.m.

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Bernstein, David. Non-Uniform Switching of the Perpendicular Magnetization in a Spin-Torque Magnetic Nanopillar, article, June 1, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc830096/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.