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

DOI: 10.1063/1.4892942 DOI Help

Authors: D. Parkes (University of Nottingham) , R. Beardsley (University of Nottingham) , S. Bowe (University of Nottingham) , I. Isakov (London Centre of Nanotechnology, University College London) , P. A. Warburton (London Centre of Nanotechnology, University College London) , K. Edmonds (University of Nottingham) , R. P. Campion (University of Nottingham) , B. L. Gallagher (University of Nottingham) , A. Rushforth (University of Nottingham) , S. Cavill (University of York, Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 105 (6) , PAGES 21508-21520

State: Published (Approved)
Published: August 2014
Diamond Proposal Number(s): 8560

Abstract: 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 Fe81Ga19 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.

Journal Keywords: Antiferromagnetism; Electron Microscopy; Epitaxy; Gallium Compounds; Iron Compounds; Magnetostriction; Microwave Radiation; Oscillators; Photoemission; Piezoelectricity; Spin Waves; X Radiation

Subject Areas: Physics

Instruments: I06-Nanoscience

Added On: 28/08/2014 08:59

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