Using the plane-wave expansion method under supercell approximation,band structures of spin waves propagating with coupling characteristics between point defects in 2-D magnonic crystals are calculated.The results indicate that the point defects in these structures can create localized states inside the band gap.The characteristics and the magnetization distributions of these localized states are studied.It shows that the group velocities of the localized states almost equal to zero in the whole first Brillouin zone,and numbers of localized states and theirs frequency-positions in the band gap are related to the size of the point defect.These characteristics of coupling between localized magnonic crystals are referential to the research on directional the fabricating materials of narrow bandpass spin-wave filters.
{"title":"Coupling Characteristics of Point Defect States in Two-dimensional Magnonic Crystals","authors":"Cao Yong-jun","doi":"10.7498/aps.61.117501","DOIUrl":"https://doi.org/10.7498/aps.61.117501","url":null,"abstract":"Using the plane-wave expansion method under supercell approximation,band structures of spin waves propagating with coupling characteristics between point defects in 2-D magnonic crystals are calculated.The results indicate that the point defects in these structures can create localized states inside the band gap.The characteristics and the magnetization distributions of these localized states are studied.It shows that the group velocities of the localized states almost equal to zero in the whole first Brillouin zone,and numbers of localized states and theirs frequency-positions in the band gap are related to the size of the point defect.These characteristics of coupling between localized magnonic crystals are referential to the research on directional the fabricating materials of narrow bandpass spin-wave filters.","PeriodicalId":13556,"journal":{"name":"Information Recording Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72944275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recently, magnonic crystals which are the magnetic counterparts of photonic crystals or phononic crystals are growing into a hot area of research. In this paper, a plane-wave expansion method in the field of magnonic crystals is proposed. By using this method, band structures of two-dimensional magnonic crystals composed of ferromagnetic materials Fe and EuO are calculated. The numerical results show that the spin-wave gaps will be generated under a definite filling fraction ratio, and the effect of exchange field on the band structure is larger than that of other field in the effective field.
{"title":"Band-structure calculations of two-dimesional magnonic crystals with plane-wave expansion method*","authors":"Yong-jun Cao, Guo-Hong Yun, Narsu","doi":"10.7498/aps.60.077502","DOIUrl":"https://doi.org/10.7498/aps.60.077502","url":null,"abstract":"Recently, magnonic crystals which are the magnetic counterparts of photonic crystals or phononic crystals are growing into a hot area of research. In this paper, a plane-wave expansion method in the field of magnonic crystals is proposed. By using this method, band structures of two-dimensional magnonic crystals composed of ferromagnetic materials Fe and EuO are calculated. The numerical results show that the spin-wave gaps will be generated under a definite filling fraction ratio, and the effect of exchange field on the band structure is larger than that of other field in the effective field.","PeriodicalId":13556,"journal":{"name":"Information Recording Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85555333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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