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Abstract
Parametric pumping is a nonlinear wave phenomenon and a promising technique for electronic devices based on spin waves, so-called “magnonics”. For parametric excitation, a magnetic nanowire system that has a built-in dc current line to produce an Oersted field is designed, and for spin wave detection, a micro-Brillouin light scattering (μ-BLS) system is used. A spin wave with a frequency of fsw = 5.6 GHz is observed when a pumping microwave with a frequency of fmw = 11.2 GHz is applied. The wave is found to be of the n = 1 width mode (n is the antinode number), and its mode changes to an edge-localized (or possibly n > 1) mode when the Oersted field (or current) varies. Joule heating effects are not observed in the pumping process. Thus, spin wave mode control by the built-in current would be a convenient and useful method to enhance the efficiency and compatibility in applications of spin-based electronics.
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Details
1 Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering, Gwangju, Republic of Korea (GRID:grid.61221.36) (ISNI:0000 0001 1033 9831); Korea Institute of Industrial Technology, Smart Energy & Nano Photonics Group, Gwangju, Republic of Korea (GRID:grid.454135.2) (ISNI:0000 0000 9353 1134)
2 Korea Institute of Industrial Technology, Smart Energy & Nano Photonics Group, Gwangju, Republic of Korea (GRID:grid.454135.2) (ISNI:0000 0000 9353 1134)
3 Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering, Gwangju, Republic of Korea (GRID:grid.61221.36) (ISNI:0000 0001 1033 9831)
4 Mokpo National Maritime University, Division of Navigation Science, Mokpo, Republic of Korea (GRID:grid.444030.7) (ISNI:0000 0004 0533 1140)