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Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets


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Title: Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets
Authors: Iacocca, Ezio
E-mail: ezio.iacocca@physics.gu.se
Issue Date: 12-May-2014
University: Göteborgs universitet. Naturvetenskapliga fakulteten
Institution: Department of Physics ; Institutionen för fysik
Parts of work: I. Iacocca E. et al. Confined dissipative droplet solitons in spin-valve nanowires with perpendicular magnetic anisotropy, Phys. Rev. Lett. 112, 047201 (2014).
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II. Iacocca E. et al. Generation linewidth of mode-hopping spin torque oscillators, Phys. Rev. B 89, 054402 (2014).
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III. Dumas R.K., Iacocca E., et al. Spin-Wave-Mode Coexistence on the Nanoscale: A Consequence of the Oersted-Field-Induced Asymmetric Energy Landscape, Phys. Rev. Lett. 110, 257202 (2013).
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IV. Iacocca E. and Åkerman J. Resonant excitation of injection-locked spin-torque oscillators, Phys. Rev. B 87, 214428 (2013).
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V. Iacocca E. and Åkerman J. Analytical investigation of modulated spin-torque oscillators in the framework of coupled differential equations with variable coefficients, Phys. Rev. B 85, 184420 (2012).
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VI. Iacocca E. and Åkerman J. Destabilization of serially connected spin-torque oscillators via non-Adlerian dynamics, J. Appl. Phys 110, 103910 (2011).
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Date of Defence: 2014-06-05
Disputation: Torsdagen den 5 juni 2014, kl. 14.00, Hörsal HA3, Hörsälvägen 4
Degree: Doctor of Philosophy
Publication type: Doctoral thesis
Keywords: Spin torque oscillators
Spintronics
Abstract: Spin torque oscillators (STOs) are magnetic nano-devices in which strongly non-linear magnetodynamic phenomena can be excited by current. In this thesis, we study some of these phenomena by means of micromagnetic simulations, analytical calculations, and electrical characterization. Three main subjects are discussed: 1. External perturbations, which can induce synchronization and modulation. In the former case, STOs are shown to exhibit an under-damped or non-Adlerian behavior, defining a min... more
ISBN: 978-91-628-8981-4
URI: http://hdl.handle.net/2077/35260
Appears in Collections:Doctoral Theses from University of Gothenburg / Doktorsavhandlingar från Göteborgs universitet
Doctoral Theses / Doktorsavhandlingar Institutionen för fysik

 

 

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