期刊
JOURNAL OF APPLIED PHYSICS
卷 104, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2963688
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资金
- U.S. Army Research Office MURI [W911NF-04-1-0247]
- Naval Research [N00014-06-1-0889]
- National Science Foundation [ECCS-0725386]
Spin wave pulse propagation in a magnetic thin film under static, spatially nonuniform magnetic fields has been studied. The experiment was carried out with an yttrium iron garnet film strip. The film strip was magnetized with a spatially nonuniform magnetic field parallel to the length of the film strip. Spin wave pulses were excited with a microstrip transducer at one end of the film strip. The spin wave pulse propagation along the film strip was mapped with a high-resolution time- and space-resolved inductive magnetodynamic probe. The wave number for the spin wave pulses was found to increase in a spatially increasing field and decrease in a spatially decreasing field. The wave number change in a static, general spatially varying static field is reversible for this field-film geometry. The phase velocity was found to decrease in a spatially increasing magnetic field and increase in a spatially decreasing field. The carrier frequency of the spin wave pulses remained constant throughout pulse propagation. (C) 2008 American Institute of Physics.
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