Ulrichs, Henning

[["dc.bibliographiccitation.firstpage","107"],["dc.bibliographiccitation.issue","4-5"],["dc.bibliographiccitation.journal","Physics Reports"],["dc.bibliographiccitation.lastpage","136"],["dc.bibliographiccitation.volume","507"],["dc.contributor.author","Lenk, Benjamin"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Garbs, F."],["dc.contributor.author","Muenzenberg, Markus G."],["dc.date.accessioned","2018-11-07T08:50:55Z"],["dc.date.available","2018-11-07T08:50:55Z"],["dc.date.issued","2011"],["dc.description.abstract","Novel material properties can be realized by designing waves' dispersion relations in artificial crystals. The crystal's structural length scales may range from nano- (light) up to centimeters (sound waves). Because of their emergent properties these materials are called metamaterials. Different to photonics, where the dielectric constant dominantly determines the index of refraction, in a ferromagnet the spin-wave index of refraction can be dramatically changed already by the magnetization direction. This allows a different flexibility in realizing dynamic wave guides or spin-wave switches. The present review will give an introduction into the novel functionalities of spin-wave devices, concepts for spin-wave based computing and magnonic crystals. The parameters of the magnetic metamaterials are adjusted to the spin-wave k-vector such that the magnonic band structure is designed. However, already the elementary building block of an antidot lattice, the singular hole, owns a strongly varying internal potential determined by its magnetic dipole field and a localization of spin-wave modes. Photo-magnonics reveal a way to investigate the control over the interplay between localization and delocalization of the spin-wave modes using femtosecond lasers, which is a major focus of this review. We will discuss the crucial parameters to realize free Bloch states and how, by contrast, a controlled localization might allow us to gradually turn on and manipulate spin-wave interactions in spin-wave based devices in the future. (C) 2011 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.physrep.2011.06.003"],["dc.identifier.isi","000297779300001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21804"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1873-6270"],["dc.relation.issn","0370-1573"],["dc.title","The building blocks of magnonics"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","092506"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.volume","97"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Lenk, Benjamin"],["dc.contributor.author","Muenzenberg, Markus G."],["dc.date.accessioned","2018-11-07T08:40:15Z"],["dc.date.available","2018-11-07T08:40:15Z"],["dc.date.issued","2010"],["dc.description.abstract","In this paper time-resolved magneto-optical Kerr effect experiments on structured CoFeB films are presented. The geometries considered are two dimensional square lattices of micrometer-sized antidots, fabricated by a focused ion beam. The spin-wave spectra of these magnonic crystals show a precessional mode, which can be related to a Bloch state at the zone boundary. Additionally, another magnetic mode of different nature appears, whose frequency displays no dependence on the externally applied magnetic field. These findings are interpreted as delocalized and localized modes, respectively. (C) 2010 American Institute of Physics. [doi :10.1063/1.3483136]"],["dc.identifier.doi","10.1063/1.3483136"],["dc.identifier.isi","000282187200044"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19184"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","0003-6951"],["dc.title","Magnonic spin-wave modes in CoFeB antidot lattices"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","71"],["dc.bibliographiccitation.lastpage","81"],["dc.bibliographiccitation.seriesnr","125"],["dc.contributor.author","Lenk, Benjamin"],["dc.contributor.author","Garbs, Fabian"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Abeling, Nils O."],["dc.contributor.author","Muenzenberg, Markus G."],["dc.date.accessioned","2018-11-07T09:29:48Z"],["dc.date.available","2018-11-07T09:29:48Z"],["dc.date.issued","2013"],["dc.description.abstract","In the framework of magnonics, all-optical femtosecond laser experiments are used to study spin waves and their relaxation paths. Magnonic crystal structures based on antidots allow the control over the spin-wave modes. In these two-dimensional magnetic metamaterials with periodicities in the wave-length range of dipolar spin waves, the spin-wave bands and dispersion are modified. Hence, a specific selection of spin-wave modes excited by laser pulses is possible. Different to photonics, the modes depend strongly on the strength of the magnetostatic potential at around each antidot site - the dipolar field. While this may lead to a mode localization, also for filling fractions around or below 10 %, Bloch states are found in low damping ferromagnetic metals. In this chapter, an overview of these mechanisms is given and the connection to spin-wave band spectra calculated from an analytical model is established. Namely, the plane-wave method yields flattened bands as well as band gaps at the antidot lattice Brillouin zone boundary."],["dc.identifier.doi","10.1007/978-3-642-30247-3_6"],["dc.identifier.isi","000321718800007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31138"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Berlin"],["dc.relation.crisseries","Topics in Applied Physics"],["dc.relation.isbn","978-3-642-30246-6"],["dc.relation.ispartof","MAGNONICS: FROM FUNDAMENTALS TO APPLICATIONS"],["dc.relation.ispartofseries","Topics in Applied Physics; 125"],["dc.relation.issn","0303-4216"],["dc.title","Photo-Magnonics"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]