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Publication Citation: 'Ballistic' vs. 'Diffusive' Transport in Current-Induced Magnetization Switching

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Author(s): N Theodoropoulou; Abhishek Sharma; W Pratt; J. Bass; Mark D. Stiles; J Xiao;
Title: 'Ballistic' vs. 'Diffusive' Transport in Current-Induced Magnetization Switching
Published: December 21, 2007
Abstract: We test whether current-induced magnetization switching due to spin-transfer-torque in ferromagnetic/non-magnetic/ferromagnetic (F/N/F) trilayers changes significantly when scattering within the N-metal layers is changed from ballistic to diffusive. Here ballistic corresponds to a ratio r = λ/t = 3 for a Cu spacer layer, and diffusive to r = 0.4 for a CuGe alloy spacer layer, where λ is the mean-free-path in the N-layer of fixed thickness t = 10 nm. The average switching currents for the alloy spacer layer are only modestly larger than those for Cu. The best available model predicts a much greater sensitivity of the switching currents to diffuse scattering in the spacer layer than we see.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Volume: 76
Issue: 22
Pages: 4 pp.
Keywords: ballistic transport,Boltzmann equation,current-induced magnetization,diffusive transport,nanopillar,spin-transfer torque,spin-valve
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (247KB)