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Title: Voltage controlled modification of flux closure domains in planar magnetic structures for microwave applications

Voltage controlled modification of the magnetocrystalline anisotropy in a hybrid piezoelectric/ferromagnet device has been studied using Photoemission Electron Microscopy with X-ray magnetic circular dichroism as the contrast mechanism. The experimental results demonstrate that the large magnetostriction of the epitaxial Fe{sub 81}Ga{sub 19} layer enables significant modification of the domain pattern in laterally confined disc structures. In addition, micromagnetic simulations demonstrate that the strain induced modification of the magnetic anisotropy allows for voltage tuneability of the natural resonance of both the confined spin wave modes and the vortex motion. These results demonstrate the possibility for using voltage induced strain in low-power voltage tuneable magnetic microwave oscillators.
Authors:
; ; ; ; ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4] ;  [2]
  1. School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD (United Kingdom)
  2. (United Kingdom)
  3. London Centre of Nanotechnology, University College London, London WC1H 0AH (United Kingdom)
  4. Department of Physics, University of York, Heslington, York YO10 5DD (United Kingdom)
Publication Date:
OSTI Identifier:
22318004
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 6; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; ELECTRON MICROSCOPY; EPITAXY; GALLIUM COMPOUNDS; IRON COMPOUNDS; MAGNETOSTRICTION; MICROWAVE RADIATION; OSCILLATORS; PHOTOEMISSION; PIEZOELECTRICITY; SPIN WAVES; X RADIATION