Detection of picosecond magnetization dynamics of 50 nm magnetic dots down to the single dot regime
arXiv:1111.4625 · doi:10.1021/nn202791g
Abstract
We report an all-optical time-domain detection of picosecond magnetization dynamics of arrays of 50 nm Ni80Fe20 (permalloy) dots down to the single nanodot regime. In the single nanodot regime the dynamics reveals one dominant resonant mode corresponding to the edge mode of the 50 nm dot with slightly higher damping than that of the unpatterned thin film. With the increase in areal density of the array both the precession frequency and damping increases significantly due to the increase in magnetostatic interactions between the nanodots and a mode splitting and sudden jump in apparent damping are observed at an edge-to-edge separation of 50 nm.
16 pages, 5 figures; ACS Nano, ASAP (2011)
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- Ferromagnetic resonance in periodic particle arrays
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- Magnonic Band Structure, Complete Bandgap and Collective Spin Wave Excitation in Nanoscale Two--Dimensional Magnonic Crystals
- Applications of Nanomagnets as Dynamical Systems
- The effect of material defects on resonant spin wave modes in a nanomagnet
- Nanochannels for Spin-Wave Manipulation in Ni80Fe20 Nanodot Arrays
- All optical detection of picosecond spin-wave dynamics in two-dimensional annular antidot lattice
- Effects of Nanodots Shape and Lattice Constants on the Spin Wave Dynamics of Patterned Permalloy Dots
- Magnetization Dynamics in Quasiperiodic Magnonic Crystals
- Optical excitation and detection of high-frequency Sezawa modes in Si/SiO2 system decorated with Ni80Fe20 nanodot arrays