Session J19: Focus Session: Spin Transport & Magnetization Dynamics in Metals IV
11:15 AM–2:15 PM, Tuesday, March 22, 2011
Room: D170
Sponsoring Units:
GMAG DMP FIAP
Chair: Peter Fischer, Lawrence Berkeley National Laboratory
Abstract ID: BAPS.2011.MAR.J19.7
Abstract: J19.00007 : Temperature dependence of domain wall dynamics in Permalloy nanowires
12:51 PM–1:03 PM
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Abstract 
Authors:
Jusang Yang
(Department of Physics, The University of Texas at Austin)
James L. Erskine
(Department of Physics, The University of Texas at Austin)
Current-driven [1] and current-assisted field-driven [2] domain wall dynamics in ferromagnetic nanowires have the thermal effects resulting from Joule heating, which make difficult to separate the spin-torque effects on domain wall displacements. To understand the thermal effects on domain wall dynamics, temperature dependence of field-driven domain wall velocity was studied using high-bandwidth scanning Kerr polarimetry. Domain wall velocity curves of 20 nm thick Permalloy nanowires with various widths (from 400 nm to 1000 nm) were measured with increasing temperature from 300 K to 400 K. Walker critical fields decreased with increasing temperature, which can be attributed to thermal excitations, and temperature-induced stochastic dynamics mode changes were observed. The results will be discussed in relation to internal domain wall structures.\\[4pt] [1] M. Klaui et al., Phys. Rev. Lett. 95, 026601 (2005).\\[0pt] [2] G.S.D. Beach et al., Phys. Rev. Lett. 97, 057203 (2006).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.J19.7