Journal
PHYSICAL REVIEW B
Volume 90, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.060405
Keywords
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Funding
- Ministry of Education, Singapore under Academic Research Fund Grant [R144-000-340-112]
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Using Brillouin spectroscopy, an observation has been made of the band structures of nanostructured defect magnonic crystals. The samples are otherwise one-dimensional periodic arrays of equal-widthNi(80)Fe(20) and cobalt nanostripes, where the defects are stripes of a different width. A dispersionless defect branch emerges within the band gapwith a frequency tunable by varying the defect stripe width, while the other branches observed are similar to those of a defect-free crystal. Micromagnetic and finite-element simulations performed unveil additional tiny band gaps and the frequency-dependent localization of the defect mode in the vicinity of the defects.
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