Moshnyaga, Vasily T.

[["dc.bibliographiccitation.firstpage","56"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Materials"],["dc.bibliographiccitation.lastpage","61"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Mueller, Georg M."],["dc.contributor.author","Walowski, Jakob"],["dc.contributor.author","Djordjevic, Marija"],["dc.contributor.author","Miao, Gou-Xing"],["dc.contributor.author","Gupta, Arunava"],["dc.contributor.author","Ramos, Ana V."],["dc.contributor.author","Gehrke, Kai"],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Samwer, Konrad H."],["dc.contributor.author","Schmalhorst, Jan"],["dc.contributor.author","Thomas, Andy"],["dc.contributor.author","Huetten, Andreas"],["dc.contributor.author","Reiss, Guenter"],["dc.contributor.author","Moodera, Jagadeesh S."],["dc.contributor.author","Muenzenberg, Markus G."],["dc.date.accessioned","2018-11-07T08:35:10Z"],["dc.date.available","2018-11-07T08:35:10Z"],["dc.date.issued","2009"],["dc.description.abstract","Knowledge of the spin polarization is of fundamental importance for the use of a material in spintronics applications. Here, we used femtosecond optical excitation of half-metals to distinguish between half-metallic and metallic properties. Because the direct energy transfer by Elliot-Yafet scattering is blocked in a half-metal, the demagnetization time is a measure for the degree of half-metallicity. We propose that this characteristic enables us vice versa to establish a novel and fast characterization tool for this highly important material class used in spin-electronic devices. The technique has been applied to a variety of materials where the spin polarization at the Fermi level ranges from 45 to 98%: Ni, Co2MnSi, Fe3O4, La0.66Sr0.33MnO3 and CrO2."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [SPP 1133, SFB 602]; NSF; ONR; NSF MRSEC"],["dc.identifier.doi","10.1038/NMAT2341"],["dc.identifier.isi","000261866700020"],["dc.identifier.pmid","19079243"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17997"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","1476-4660"],["dc.relation.issn","1476-1122"],["dc.title","Spin polarization in half-metals probed by femtosecond spin excitation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","197401"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","98"],["dc.contributor.author","Pimenov, A."],["dc.contributor.author","Loidl, Alois"],["dc.contributor.author","Gehrke, Kai"],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Samwer, Konrad H."],["dc.date.accessioned","2018-11-07T11:02:25Z"],["dc.date.available","2018-11-07T11:02:25Z"],["dc.date.issued","2007"],["dc.description.abstract","It is generally believed that nature does not provide materials with negative refraction. Here we demonstrate experimentally that such materials do exist at least at GHz frequencies: ferromagnetic metals reveal a negative refraction index close to the frequency of the ferromagnetic resonance. The experimental realization utilizes a colossal magnetoresistance manganite La2/3Ca1/3MnO3 as an example. In this material the negative refractive index can be achieved even at room temperature using external magnetic fields."],["dc.identifier.doi","10.1103/PhysRevLett.98.197401"],["dc.identifier.isi","000246413200053"],["dc.identifier.pmid","17677658"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51379"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Negative refraction observed in a metallic ferromagnet in the gigahertz frequency range"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","064401"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW B"],["dc.bibliographiccitation.volume","75"],["dc.contributor.author","Mishina, E. D."],["dc.contributor.author","Morosov, A. I."],["dc.contributor.author","Mishina, A. V."],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Sudheendra, L."],["dc.contributor.author","Samwer, Konrad H."],["dc.contributor.author","Rasing, Th."],["dc.date.accessioned","2018-11-07T11:05:33Z"],["dc.date.available","2018-11-07T11:05:33Z"],["dc.date.issued","2007"],["dc.description.abstract","The crystallographic and magnetic symmetry of centrosymmetric perovskite manganite epitaxial films is studied by magnetization-induced optical second harmonic generation (MSHG). It is shown that not only linear but also quadratic terms in the magnetization affect the nonlinear-optical response, the latter being even dominant for special geometries. In that case MSHG allows to simultaneously probe the crystallographic structure, the net magnetization (zero in demagnetized material), and magnetization squared (nonzero in demagnetized material)."],["dc.identifier.doi","10.1103/PhysRevB.75.064401"],["dc.identifier.isi","000244533000038"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52090"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","1098-0121"],["dc.title","Quadratic effects in the nonlinear magneto-optical response of perovskite manganites studied with magnetization-induced second harmonic generation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","489"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Crystals"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Moshnyaga, Vasily"],["dc.contributor.author","Samwer, Konrad"],["dc.date.accessioned","2019-09-24T09:47:53Z"],["dc.date.available","2019-09-24T09:47:53Z"],["dc.date.issued","2019"],["dc.description.abstract","Transition metal functional oxides, e.g., perovskite manganites, with strong electron, spin and lattice correlations, are well-known for different phase transitions and field-induced colossal effects at the phase transition. Recently, the interfaces between dissimilar perovskites were shown to be a promising concept for the search of emerging phases with novel functionalities. We demonstrate that the properties of manganite films are effectively controlled by low dimensional emerging phases at intrinsic and extrinsic interfaces and appeared as a result of symmetry breaking. The examples include correlated Jahn–Teller polarons in the phase-separated (La1−yPry)0.7Ca0.3MnO3, electron-rich Jahn–Teller-distorted surface or “dead” layer in La0.7Sr0.3MnO3, electric-field-induced healing of “dead” layer as an origin of resistance switching effect, and high-TC ferromagnetic emerging phase at the SrMnO3/LaMnO3 interface in superlattices. These 2D polaronic phases with short-range electron, spin, and lattice reconstructions could be extremely sensitive to external fields, thus, providing a rational explanation of colossal effects in perovskite manganites."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2019"],["dc.identifier.doi","10.3390/cryst9100489"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16406"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62462"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","MDPI"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/246102/EU//IFOX"],["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","SFB 1073 | Topical Area B | B01 Photon-induced structural phase transition controlled by electronic correlations"],["dc.relation","SFB 1073 | Topical Area B | B04 External field control of photon energy conversion in manganites"],["dc.relation.eissn","2073-4352"],["dc.relation.issn","2073-4352"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Polaronic Emergent Phases in Manganite-based Heterostructures"],["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","232405"],["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.volume","109"],["dc.contributor.author","Belenchuk, A."],["dc.contributor.author","Shapoval, O."],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Bruchmann-Bamberg, V."],["dc.contributor.author","Samwer, Konrad H."],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.date.accessioned","2018-11-07T10:04:37Z"],["dc.date.available","2018-11-07T10:04:37Z"],["dc.date.issued","2016"],["dc.description.abstract","We report on the interface engineering in correlated manganite heterostructures by octahedral decoupling using embedded stacks of atomic layers that form the Ruddlesden-Popper structure. A room temperature magnetic decoupling was achieved through deposition of a (SrO)(2)-TiO2-(SrO)(2) sequence of atomic layers at the interface between La0.7Sr0.3MnO3 and La0.7Sr0.3Mn0.9Ru0.1O3 films. Moreover, the narrowing of the interfacial dead layer in ultrathin La0.7Sr0.3MnO3 films was demonstrated by insertion of a single (SrO)(2) rock-salt layer at the interface with the SrTiO3(100) substrate. The obtained results are discussed based on the symmetry breaking and disconnection of the MnO6 octahedra network at the interface that may lead to the improved performance of all-oxide magnetic tunnel junctions. We suggest that octahedral decoupling realized by formation of Ruddlesden-Popper interfaces is an effective structural mechanism to control functionalities of correlated perovskite heterostructures. Published by AIP Publishing."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [SFB 1073]"],["dc.identifier.doi","10.1063/1.4971833"],["dc.identifier.isi","000390677700026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38737"],["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 B | B04 External field control of photon energy conversion in manganites"],["dc.relation.issn","1077-3118"],["dc.relation.issn","0003-6951"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Ruddlesden-Popper interface in correlated manganite heterostructures induces magnetic decoupling and dead layer reduction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","053102"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.volume","110"],["dc.contributor.author","Pfahl, V."],["dc.contributor.author","Phani, M. K."],["dc.contributor.author","Büchsenschütz-Göbeler, M."],["dc.contributor.author","Kumar, A."],["dc.contributor.author","Moshnyaga, V."],["dc.contributor.author","Arnold, W."],["dc.contributor.author","Samwer, K."],["dc.date.accessioned","2020-12-10T18:12:36Z"],["dc.date.available","2020-12-10T18:12:36Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1063/1.4975072"],["dc.identifier.eissn","1077-3118"],["dc.identifier.issn","0003-6951"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74427"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Conduction electrons as dissipation channel in friction experiments at the metal-metal transition of LSMO measured by contact-resonance atomic force microscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","121103"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW B"],["dc.bibliographiccitation.volume","87"],["dc.contributor.author","Krisponeit, Jon-Olaf"],["dc.contributor.author","Kalkert, Christin"],["dc.contributor.author","Damaschke, Bernd"],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Samwer, Konrad H."],["dc.date.accessioned","2018-11-07T09:27:04Z"],["dc.date.available","2018-11-07T09:27:04Z"],["dc.date.issued","2013"],["dc.description.abstract","We performed time-resolved nanoscale studies on the resistive switching of perovskite manganite thin films by means of conductive atomic force microscopy. Creep and recovery features have been observed in the evolution of metallic domains via pulse-train experiments and current map sequences. Local I (t) curves show 1/f(alpha) noise signatures during the switching process, a phenomenon which occurs in various physical processes consisting of discrete jumps of different sizes, such as the Barkhausen effect. Our results imply that the resistive switching falls into this universal class of effects with dynamics determined by the pinning and depinning of structural domain walls."],["dc.description.sponsorship","DFG [602, A2]"],["dc.identifier.doi","10.1103/PhysRevB.87.121103"],["dc.identifier.isi","000316104400001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30451"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1098-0121"],["dc.title","Time-resolved resistive switching on manganite surfaces: Creep and 1/f(alpha) a noise signatures indicate pinning of nanoscale domains"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","2387"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Merten, S."],["dc.contributor.author","Shapoval, O."],["dc.contributor.author","Damaschke, B."],["dc.contributor.author","Samwer, K."],["dc.contributor.author","Moshnyaga, Vasily"],["dc.date.accessioned","2019-07-09T11:51:04Z"],["dc.date.available","2019-07-09T11:51:04Z"],["dc.date.issued","2019"],["dc.description.abstract","A long-standing issue in the physics of the colossal magnetoresistance is the role of electron-phonon coupling, which manifests itself as Jahn-Teller polarons. The origin and architecture of polarons makes it possible to study their behavior by Raman spectroscopy, which allows to analyze the polaronic behavior in an applied magnetic field. We performed magnetic-field-dependent Raman spectroscopy on thin films of (La0.6Pr0.4)0.7Ca0.3MnO3 in a range of H = 0-50 kOe and compared the obtained Raman spectra with the magnetic field behavior of the electrical resistivity. In the vicinity of the Curie temperature, TC = 197 K, the intensity of the Jahn-Teller stretching mode at 614 cm-1 and of the bending mode at 443 cm-1 was found to be suppressed and enhanced, respectively. This observed behavior has a remarkable similarity with the field and temperature dependence of the colossal magnetoresistance in (La0.6Pr0.4)0.7Ca0.3MnO3. Our work provides direct evidence that the reduction of the amount of Jahn-Teller polarons at the phase transition is the main mechanism underlying the colossal magnetoresistance."],["dc.identifier.doi","10.1038/s41598-019-39597-1"],["dc.identifier.pmid","30787387"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16040"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59867"],["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","SFB 1073 | Topical Area B | B01 Photon-induced structural phase transition controlled by electronic correlations"],["dc.relation","SFB 1073 | Topical Area B | B04 External field control of photon energy conversion in manganites"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.subject.ddc","530"],["dc.title","Magnetic-Field-Induced Suppression of Jahn-Teller Phonon Bands in (La0.6Pr0.4)0.7Ca0.3MnO3: the Mechanism of Colossal Magnetoresistance shown by Raman Spectroscopy"],["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","144440"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW B"],["dc.bibliographiccitation.volume","82"],["dc.contributor.author","Krisponeit, Jon-Olaf"],["dc.contributor.author","Kalkert, Christin"],["dc.contributor.author","Damaschke, Bernd"],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Samwer, Konrad H."],["dc.date.accessioned","2018-11-07T08:37:54Z"],["dc.date.available","2018-11-07T08:37:54Z"],["dc.date.issued","2010"],["dc.description.abstract","We report the local-conductivity properties of a La0.8Ca0.2MnO3 thin film, studied by conductive atomic force microscopy. Nonvolatile and bipolar reversible switching of nanometer-sized regions was observed. A threshold voltage, U-c approximate to 3 V, and a logarithmic pulse-width dependence compatible with domain-wall creep were revealed. The results are difficult to explain in terms of an ionic drift scenario but rather indicate a switching mechanism based on orbital and accompanying structural changes. A phenomenological model of an electric field-induced structural transition is proposed."],["dc.description.sponsorship","DFG [SFB 602, TPA2]; Leibniz program"],["dc.identifier.doi","10.1103/PhysRevB.82.144440"],["dc.identifier.isi","000283574200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18651"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1098-0121"],["dc.title","Nanoscale resistance switching in manganite thin films: Sharp voltage threshold and pulse-width dependence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","7360"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Journal of Applied Physics"],["dc.bibliographiccitation.lastpage","7362"],["dc.bibliographiccitation.volume","95"],["dc.contributor.author","Moshnyaga, Vasily T."],["dc.contributor.author","Giske, A."],["dc.contributor.author","Samwer, Konrad H."],["dc.contributor.author","Mishina, E."],["dc.contributor.author","Tamura, T."],["dc.contributor.author","Nakabayashi, S."],["dc.contributor.author","Belenchuk, A."],["dc.contributor.author","Shapoval, O."],["dc.contributor.author","Kulyuk, L."],["dc.date.accessioned","2018-11-07T10:48:31Z"],["dc.date.available","2018-11-07T10:48:31Z"],["dc.date.issued","2004"],["dc.description.abstract","The increase of the resistance up to two orders of magnitude under laser illumination (lambda=760 nm) was observed in La0.7Ca0.3MnO3 (LCMO) epitaxial thin films in ferromagnetic state. Optical absorption also increases by 10-15 % and the magnetic second-harmonic generation signal decreases down to zero under the irradiation. The light induced changes are reversible with characteristic relaxation times tausimilar to1-30 s. Magnetic field, B=4 T, suppresses the photoconductivity and decreases its relaxation time. Photoinduced effects are caused by the injection of a large number of extra carriers, which change the (antiferromagnetic) AFM/FM phase balance in LCMO, favoring the insulating AFM state. (C) 2004 American Institute of Physics."],["dc.identifier.doi","10.1063/1.1687555"],["dc.identifier.isi","000221657900280"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48216"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.publisher.place","Melville"],["dc.relation.conference","9th Joint Magnetism and Magnetic Materials Conference/ International Magnetics Conference"],["dc.relation.eventlocation","Anaheim, CA"],["dc.relation.issn","0021-8979"],["dc.title","Giant negative photoconductivity in La0.7Ca0.3MnO3 thin films"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]