Imaging of spin dynamics in closure domain and vortex structures
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- 17 January 2003
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 67 (2)
- https://doi.org/10.1103/physrevb.67.020403
Abstract
Time-resolved Kerr microscopy is used to study the excitations of individual micron-scale ferromagnetic thin-film elements in their remnant state. Thin (18 nm) square elements with edge dimensions between 1 and form closure domain structures with 90 deg Néel walls between domains. We identify two classes of excitations in these systems. The first corresponds to precession of the magnetization about the local demagnetizing field in each quadrant, while the second excitation is localized in the domain walls. Two modes are also identified in ferromagnetic disks with thicknesses of 60 nm and diameters from down to 500 nm. The equilibrium state of each disk is a vortex with a singularity at the center. As in the squares, the higher-frequency mode is due to precession about the internal field, but in this case the lower-frequency mode corresponds to gyrotropic motion of the entire vortex. These results demonstrate clearly the existence of well-defined excitations in inhomogeneously magnetized microstructures. DOI: http://dx.doi.org/10.1103/PhysRevB.67.020403 © 2003 The American Physical Society
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This publication has 19 references indexed in Scilit:
- Spin-Wave Quantization in Ferromagnetic Nickel NanowiresPhysical Review Letters, 2002
- Eigenfrequencies of vortex state excitations in magnetic submicron-size disksJournal of Applied Physics, 2002
- Comparison of experimental and numerical micromagnetic dynamics in coherent precessional switching and modal oscillationsPhysical Review B, 2002
- Brillouin light scattering studies of confined spin waves: linear and nonlinear confinementPhysics Reports, 2001
- Field evolution of magnetic vortex state in ferromagnetic disksApplied Physics Letters, 2001
- Spin-wave quantization and dynamic coupling in micron-size circular magnetic dotsApplied Physics Letters, 1999
- Single-Domain Circular NanomagnetsPhysical Review Letters, 1999
- Lateral Quantization of Spin Waves in Micron Size Magnetic WiresPhysical Review Letters, 1998
- Direct Observation of Magnetic Relaxation in a Small Permalloy Disk by Time-Resolved Scanning Kerr MicroscopyPhysical Review Letters, 1997
- Physical Theory of Ferromagnetic DomainsReviews of Modern Physics, 1949