Ulrichs, Henning

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Meyer, Dennis"],["dc.contributor.author","Döring, Florian"],["dc.contributor.author","Eberl, Christian"],["dc.contributor.author","Krebs, Hans Ulrich"],["dc.date.accessioned","2019-07-09T11:43:40Z"],["dc.date.available","2019-07-09T11:43:40Z"],["dc.date.issued","2017"],["dc.description.abstract","We show how the elastic response of metallic nano-cavities can be tailored by tuning the interplay with an underlying phononic superlattice. In particular, we exploit ultrafast optical excitation in order to address a resonance mode in a tungsten thin film, grown on top of a periodic MgO/ZrO2 multilayer. Setting up a simple theoretical model, we can explain our findings by the coupling of the resonance in the tungsten to an evanescent surface mode of the superlattice. To demonstrate a second potential benefit of our findings besides characterization of elastic properties of multilayer samples, we show by micromagnetic simulation how a similar structure can be utilized for magneto-elastic excitation of exchange-dominated spin waves."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1038/s41598-017-11099-y"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14621"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/58943"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A02 Verständnis und Manipulation von Dissipationskanälen des Energietransports"],["dc.relation.issn","2045-2322"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.subject.ddc","530"],["dc.title","Spectral control of elastic dynamics in metallic nano-cavities"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","142116"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Journal of Applied Physics"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Meyer, Dennis"],["dc.contributor.author","Mueller, Kai-Markus"],["dc.contributor.author","Wittrock, Steffen"],["dc.contributor.author","Mansurova, Maria"],["dc.contributor.author","Walowski, Jakob"],["dc.contributor.author","Muenzenberg, Markus G."],["dc.date.accessioned","2018-11-07T10:07:02Z"],["dc.date.available","2018-11-07T10:07:02Z"],["dc.date.issued","2016"],["dc.description.abstract","In this article, we present the observation of coherent elastic dynamics in a nano-scale phononic superlattice, which consists of only 4 bilayers. We demonstrate how ultra-short light pulses with a length of 40 fs can be utilized to excite a coherent elastic wave at 0.535 THz, which persist over about 20 ps. In later steps of the elastic dynamics, modes with frequency of 1.7 THz and above appear. All these modes are related to acoustic band gaps. Thus, the periodicity strongly manifests in the wave physics, although the system under investigation has only a small number of spatial periods. To further illustrate this, we show how by breaking the translational invariance of the superlattice, these features can be suppressed. Discussed in terms of phonon blocking and radiation, we elucidate in how far our structures can be considered as useful building blocks for phononic devices. Published by AIP Publishing."],["dc.description.sponsorship","DFG, within the CRC [1073]"],["dc.identifier.doi","10.1063/1.4961978"],["dc.identifier.isi","000386535400018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39208"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A02 Verständnis und Manipulation von Dissipationskanälen des Energietransports"],["dc.relation.issn","1089-7550"],["dc.relation.issn","0021-8979"],["dc.title","THz elastic dynamics in finite-size CoFeB-MgO phononic superlattices"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","IEEE Transactions on Magnetics"],["dc.bibliographiccitation.lastpage","4"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Wittrock, Steffen"],["dc.contributor.author","Meyer, Dennis"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Walowski, Jakob"],["dc.contributor.author","Mansurova, Maria"],["dc.contributor.author","Martens, Ulrike"],["dc.contributor.author","Müller, Markus"],["dc.contributor.author","Münzenberg, Markus"],["dc.date.accessioned","2020-12-10T18:26:18Z"],["dc.date.available","2020-12-10T18:26:18Z"],["dc.date.issued","2017"],["dc.description.abstract","Spin currents offer a way to control static and dynamic magnetic properties, and therefore they are crucial for next-generation MRAM devices or spin-torque oscillators. Manipulating the dynamics is especially interesting within the context of photo-magnonics. In typical d$ transition metal ferromagnets like CoFeB, the lifetime of light-induced magnetization dynamics is restricted to about 1 ns, which e.g. strongly limits the opportunities to exploit the wave nature in a magnonic crystal filtering device. Here, we investigate the potential of spin-currents to increase the spin wave lifetime in a functional bilayer system, consisting of a heavy metal (8 nm of $\\betaehBTantalum (Platinum)) and 5 nm CoFeB. Due to the spin Hall effect, the heavy metal layer generates a transverse spin current when a lateral charge current passes through the strip. Using time-resolved all-optical pump-probe spectroscopy, we investigate how this spin current affects the magnetization dynamics in the adjacent CoFeB layer. We observed a linear spin current manipulation of the effective Gilbert damping parameter for the Kittel mode from which we were able to determine the system's spin Hall angles. Furthermore, we measured a strong influence of the spin current on a high-frequency mode. We interpret this mode an an exchange dominated higher order spin-wave resonance. Thus we infer a strong dependence of the exchange constant on the spin current."],["dc.identifier.arxiv","1912.07728v1"],["dc.identifier.doi","10.1109/TMAG.2017.2703856"],["dc.identifier.eissn","1941-0069"],["dc.identifier.issn","0018-9464"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76031"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.issn","0018-9464"],["dc.relation.issn","1941-0069"],["dc.title","Spin-Current Manipulation of Photo-Induced Magnetization Dynamics in Heavy Metal/Ferromagnet Double Layer-Based Nanostructures"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","040004"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","AIP Conference Proceedings"],["dc.bibliographiccitation.volume","1763"],["dc.contributor.author","Ulrichs, Henning"],["dc.contributor.author","Meyer, Dennis"],["dc.contributor.author","Müller, Markus"],["dc.contributor.author","Mansurova, Maria"],["dc.contributor.author","Döring, Florian"],["dc.date.accessioned","2020-03-09T13:19:50Z"],["dc.date.available","2020-03-09T13:19:50Z"],["dc.date.issued","2016"],["dc.description.abstract","n this article we discuss the implementation of a finite-difference time-domain simulation method, which describes thermal diffusion and elastic dynamics induced by an ultrashort laser-pulse. Besides the pseudocode, we provide an example in which numerical results are compared with experimental data, showing excellent agreement."],["dc.identifier.doi","10.1063/1.4961352"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/63239"],["dc.language.iso","en"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A02 Verständnis und Manipulation von Dissipationskanälen des Energietransports"],["dc.relation.issn","0094-243X"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Numerical calculation of laser-induced thermal diffusion and elastic dynamics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]