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

Journal Article · Mon Aug 11 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4892942· OSTI ID:22318004

Parkes, D. E.; Beardsley, R.; Edmonds, K. W.; Campion, R. P.; Gallagher, B. L.; Bowe, S. ^[1]; Isakov, I.; Warburton, P. A. ^[2]

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1. School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD (United Kingdom)
2. London Centre of Nanotechnology, University College London, London WC1H 0AH (United Kingdom)

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.

• OSTI ID: 22318004
• Journal Information: Applied Physics Letters, Vol. 105, Issue 6; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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