Broadband injection and scattering of spin waves in lossy width-modulated magnonic crystal waveguides

被引：21
|
作者：
Arikan, M. [1 ]
Au, Y. [2 ]
Vasile, G. [1 ,3 ]
Ingvarsson, S. [1 ]
Kruglyak, V. V. [2 ]
机构：
[1] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[2] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[3] Natl Inst Res & Dev Cryogen & Isotop Technol, RO-1000 Ramnicu, Valcea, Romania
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2013年 / 46卷 / 13期
基金：
英国工程与自然科学研究理事会;
关键词：
BOSE-EINSTEIN CONDENSATION; PROPAGATION; GAPS;
D O I：
10.1088/0022-3727/46/13/135003
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have used the time-resolved scanning Kerr microscopy to study the spin-wave injection from the semi-infinite magnetic films ('reservoirs') into unmodulated (straight) and periodically modulated magnonic waveguides. The measurements reveal a broadband nature of the spin-wave injection in the frequency domain. The demonstrated tunability range of 0.8 GHz is determined by the linewidth of the reservoir's uniform resonance peak. In contrast to the unmodulated waveguide, we have observed a standing spin wave in the modulated waveguide that existed as a result of a direct coupling between the global microwave field and the finite wavelength spin waves mediated by the spatial periodicity of the waveguide. The measurements are discussed in terms of the important role played by magnetic damping in magnonics.
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页数：6
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