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Title: Micromagnetic analysis of dynamical bubble-like solitons based on the time domain evolution of the topological density

Dynamical bubble-like solitons have been recently investigated in nanocontact-based spin-torque oscillators with a perpendicular free layer. Those magnetic configurations can be excited also in different geometries as long as they consist of perpendicular materials. Thus, in this paper, a systematic study of the influence of both external field and high current on that kind of dynamics is performed for a spin-valve point-contact geometry where both free and fixed layers present strong perpendicular anisotropy. The usage of the topological density tool highlights the excitation of complex bubble/antibubble configurations. In particular, at high currents, a deformation of the soliton and its simultaneous shift from the contact area are observed and can be ascribable to the Oersted field. Results provide further detailed information on the excitation of solitons in perpendicular materials for application in spintronics, magnonics, and domain wall logic.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Electronic Engineering, Industrial Chemistry and Engineering, University of Messina, 98166 Messina (Italy)
  2. Department of Applied Physics, University of Salamanca, 37008 Salamanca (Spain)
  3. Department of Physics, Bogazici University, 34342 Bebek/Istanbul (Turkey)
  4. Institut Jean Lamour, Université de Lorraine-CNRS UMR 7198, 54506 Nancy (France)
Publication Date:
OSTI Identifier:
22273959
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; BUBBLES; DEFORMATION; DENSITY; ELECTRIC CONTACTS; ELECTRIC CURRENTS; EXCITATION; LAYERS; NANOSTRUCTURES; OSCILLATORS; SOLITONS; SPIN; TOPOLOGY