Müller, Gerhard Anton

[["dc.bibliographiccitation.artnumber","014305"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW C"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Jungclaus, A."],["dc.contributor.author","Yordanov, O."],["dc.contributor.author","Galindo, E."],["dc.contributor.author","Hausmann, M."],["dc.contributor.author","Kast, D."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Brant, S."],["dc.contributor.author","Krstic, V."],["dc.contributor.author","Vretenar, D."],["dc.contributor.author","Algora, A."],["dc.contributor.author","Brandolini, F."],["dc.contributor.author","de Angelis, G."],["dc.contributor.author","De Poli, M."],["dc.contributor.author","Fahlander, C."],["dc.contributor.author","Gadea, A."],["dc.contributor.author","Martinez, T."],["dc.contributor.author","Napoli, D. R."],["dc.contributor.author","Dewald, A."],["dc.contributor.author","Peusquens, R."],["dc.contributor.author","Tiesler, H."],["dc.contributor.author","Gorska, M."],["dc.contributor.author","Grawe, H."],["dc.contributor.author","Bizzeti, P. G."],["dc.date.accessioned","2018-11-07T08:57:13Z"],["dc.date.available","2018-11-07T08:57:13Z"],["dc.date.issued","2001"],["dc.description.abstract","The recoil-distance Doppler-shift and Doppler-shift attenuation techniques were employed to determine for the first time lifetimes of high-spin states in Cd-104 in the time range 0.3 ps less than or equal to tau less than or equal to1.2 ns. The nuclei were populated using the compound nucleus reaction Ni-58(Cr-50, 4p) and the gamma radiation from their decay was detected with the GASP spectrometer. A total of 34 reduced transition probabilities and limits for 18 further transitions were extracted providing a rich basis for a comparison with theoretical calculations. In addition, the lifetime data contained new information urging for a revision of the published level scheme of Cd-104. In particular, a magnetic dipole band recently established and interpreted as magnetic rotation is shown to he not existing. The new experimental results in Cd-104 are discussed in the frame of the interacting boson plus broken pair model."],["dc.identifier.isi","000169884000011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23342"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0556-2813"],["dc.title","High-spin structure and electromagnetic transition strengths in Cd-104"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","668"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","EUROPHYSICS LETTERS"],["dc.bibliographiccitation.lastpage","674"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Luo, Y."],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Uhrmacher, Michael"],["dc.date.accessioned","2018-11-07T10:34:19Z"],["dc.date.available","2018-11-07T10:34:19Z"],["dc.date.issued","2003"],["dc.description.abstract","We report on the observation of the ion-induced hcp --> fcc phase transition in 75 nm thick polycrystalline Co films, which were irradiated with 200 keV Xe ions to fluences of 2.5 x 10(13)-8 x 10(15) ions/cm(2) at a temperature of 300 K. Analyses by means of Rutherford Backscattering Spectroscopy (RBS), X-Ray Diffraction (XRD), Magneto-Optical Kerr Effect (MOKE) and Vibrating Sample Magnetometry (VSM) provided information on the film thickness and the implanted Xe profiles, the phase structure, the ion-induced lattice expansion and the magnetic hysteresis, respectively. After film deposition and irradiations up to 4 x 10(14) ions/cm(2), we predominantly found the hcp phase (XRD, uniaxial MOKE pattern) with an in-plane magnetization. The transition to fourfold in-plane magnetization typical of the fcc-phase occurred around a fluence of 2 x 10(15) ions/cm(2). We interpreted these findings as due to rapid cooling of thermal spikes into the metastable Co-fcc phase."],["dc.identifier.doi","10.1209/epl/i2003-00279-7"],["dc.identifier.isi","187118200014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44837"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E D P Sciences"],["dc.relation.issn","0295-5075"],["dc.title","Xenon-ion-induced phase transition in thin Co films"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","73"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.lastpage","75"],["dc.bibliographiccitation.volume","82"],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Schaaf, Peter"],["dc.date.accessioned","2018-11-07T10:41:43Z"],["dc.date.available","2018-11-07T10:41:43Z"],["dc.date.issued","2003"],["dc.description.abstract","A promising approach by which to gain information about the spin distributions in different sample layers using depth-sensitive angle-dependent conversion electron Mossbauer spectroscopy is presented in combination with magneto-optical Kerr effect, Rutherford backscattering spectrometry and x-ray diffraction investigations. Three 77 nm thick Fe films containing a 15 nm Fe-57 marker layer at different depths were deposited on Si(100) substrates and irradiated under well defined mechanical stress with 200 keV Xe ions. The distribution of the spins in the sample plane was analyzed by Mossbauer spectroscopy and by tilting the sample toward the incident gamma beam and observing the variation in angle-dependent relative intensity of the sextet lines. For the sample with the sensitive marker layer in the middle of the ferromagnetic film, all spins were found to be oriented exactly along the mechanical stress axis. This agrees with the angular properties of the macroscopic hysteresis curves measured by the magneto-optic Kerr effect. (C) 2003 American Institute of Physics."],["dc.identifier.doi","10.1063/1.1533836"],["dc.identifier.isi","000180134100025"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46610"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","0003-6951"],["dc.title","Determination of spin distributions in ion-beam magnetic textured iron films by magnetic orientation Mossbauer spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","137"],["dc.bibliographiccitation.issue","1-4"],["dc.bibliographiccitation.journal","HYPERFINE INTERACTIONS"],["dc.bibliographiccitation.lastpage","143"],["dc.bibliographiccitation.volume","158"],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Carpene, Ettore"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Faupel, J."],["dc.contributor.author","Krebs, Hans-Ulrich"],["dc.date.accessioned","2018-11-07T10:52:38Z"],["dc.date.available","2018-11-07T10:52:38Z"],["dc.date.issued","2004"],["dc.description.abstract","Modifications of magnetic properties upon heavy-ion irradiation have been recently investigated for films of ferromagnetic 3d-elements (Fe, Ni, Co) and alloys (permendur, permalloy), in relation to changes of their microstructure. Here we report on Xe-ion irradiation of a highly textured iron film prepared via pulsed-laser deposition on a MgO(100) single crystal and containing a thin Fe-57 marker layer for magnetic orientation Mossbauer spectroscopy (MOMS). We compare the results with those obtained for a polycrystalline Fe/Si(100) sample produced by electron evaporation and premagnetized before Xe-irradiation in a 300 Oe external field. Characterization of the samples also included magneto-optical Kerr effect (MOKE), Rutherford backscattering spectroscopy (RBS) and X-ray diffraction (XRD)."],["dc.identifier.doi","10.1007/s10751-005-9022-6"],["dc.identifier.isi","000235281400023"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49159"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Dordrecht"],["dc.relation.conference","Joint Meeting of the 13th International Conference on Hyperfine Interactions/17th International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2004)"],["dc.relation.eventlocation","Bonn, GERMANY"],["dc.relation.issn","0304-3843"],["dc.title","Magnetic texturing of xenon-irradiated iron films studied by magnetic orientation Mossbauer spectroscopy"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","107"],["dc.bibliographiccitation.issue","1-4"],["dc.bibliographiccitation.journal","HYPERFINE INTERACTIONS"],["dc.bibliographiccitation.lastpage","121"],["dc.bibliographiccitation.volume","160"],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Zhang, K."],["dc.date.accessioned","2018-11-07T08:40:14Z"],["dc.date.available","2018-11-07T08:40:14Z"],["dc.date.issued","2005"],["dc.description.abstract","Thin polycrystalline films of permalloy (Ni79Fe21) and permendur (Co50Fe50) have been irradiated with Xe-ions to fluences of 10(14)-10(16) ions/cm(2). Ion-induced structural and magnetic modifications have been measured by grazing angle X-ray diffraction, Rutherford backscattering and magneto-optical Kerr effect. In the case of permendur, the Xe-ion implantation first reduced the coercivity, because of stress relaxation, while higher ion fluences increased the coercivity due to pinning centers generated in the film. The ion irradiation aligned the in-plane easy axis of the magnetization along the direction of the external magnetic field during implantation. Phase shifts obtained from magnetic force microscopy confirmed these modifications. The effects of Xe-ion irradiation in permalloy films are much weaker and underline the importance of magnetostriction in the variation of the coercivity and anisotropy."],["dc.identifier.doi","10.1007/s10751-005-9153-9"],["dc.identifier.isi","234204300010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19180"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Dordrecht"],["dc.relation.conference","International Workshop on Nanomaterials, Magnetic Ions and Magnetic Semiconductors Studies mostly by Hyperfine Interactions"],["dc.relation.eventlocation","M S Univ Baroda, Phys Dept, Baroda, INDIA"],["dc.relation.issn","0304-3843"],["dc.title","Xenon-ion induced magnetic and structural modifications of ferromagnetic alloys"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1149"],["dc.bibliographiccitation.journal","Journal of Magnetism and Magnetic Materials"],["dc.bibliographiccitation.lastpage","1151"],["dc.bibliographiccitation.volume","272"],["dc.contributor.author","Kulinska, A."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Uhrmacher, Michael"],["dc.contributor.author","Zhang, Kun"],["dc.date.accessioned","2018-11-07T10:49:19Z"],["dc.date.available","2018-11-07T10:49:19Z"],["dc.date.issued","2004"],["dc.description.abstract","Perturbed angular correlation of tracer nuclei is sensitive to the size and orientation of the hyperfine field(s) in ferromagnetic films. We report on PAC measurements for In-111 nuclei in 75 nm Ni films irradiated with 200 keV Xe ions. In particular, we investigated the effects of magnetostriction when bending the samples and of the In-111 tracer implantation itself. (C) 2004 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jmmm.2003.12.018"],["dc.identifier.isi","000222236700170"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48399"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Conference on Magnetism (ICM 2003)"],["dc.relation.eventlocation","Rome, ITALY"],["dc.relation.issn","0304-8853"],["dc.title","Magnetic texture in Ni films after Xe ion implantations measured with perturbed angular correlation spectroscopy"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","350"],["dc.bibliographiccitation.journal","NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS"],["dc.bibliographiccitation.lastpage","354"],["dc.bibliographiccitation.volume","216"],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.date.accessioned","2018-11-07T10:51:33Z"],["dc.date.available","2018-11-07T10:51:33Z"],["dc.date.issued","2004"],["dc.description.abstract","We have investigated magnetic field assisted implantations of 200 keV Xe-ions in 30-90 nm thick Fe50Co50 alloy films on Si substrates at ion fluences of up to 1.3 x 10(16) cm(-2). Longitudinal magneto-optic kerr effect measurements at room temperature suggest that the coercivity of the films first decreases for increasing ion fluence, while the magnetic remanence develops as a superposition of fourfold and twofold uniaxial anisotropies. Higher Xe-ion fluences increase the density of pinning centers therefore causing slight increases of the coercivity and of the magnetostrictive anisotropy. Lattice expansion and ion-induced grain growth were measured parallel to MOKE by X-ray diffraction. (C) 2003 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.nimb.2003.11.060"],["dc.identifier.isi","000189222100059"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48918"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","Symposium on Ion Beams for Nanoscale Surface Modifications held as the European-Materials-Research-Society"],["dc.relation.eventlocation","Strasbourg, FRANCE"],["dc.relation.issn","0168-583X"],["dc.title","Magnetic modifications of thin CoFe films induced by Xe+-ion irradiation"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","751"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Acta Physica Polonica A"],["dc.bibliographiccitation.lastpage","760"],["dc.bibliographiccitation.volume","100"],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Uhrmacher, Michael"],["dc.contributor.author","Felsch, W."],["dc.contributor.author","Munzenberg, M."],["dc.date.accessioned","2018-11-07T11:24:57Z"],["dc.date.available","2018-11-07T11:24:57Z"],["dc.date.issued","2001"],["dc.description.abstract","Heavy-ion bombardment of thin ferromagnetic, polycrystalline films can induce substantial changes of their magnetic and microstructural properties. Since we first identified this effect in 50-150 nm thick Fe and Ni films irradiated with Xe-ions, we made a systematic search for the influence of various film and implantation parameters on the orientation and degree of the magnetic anisotropy and how these parameters correlate with the microstructure of the films. Several analyzing methods, such as Rutherford backscattering, magneto-optical Kerr effect, X-ray diffraction, magnetic force microscopy, In-111 perturbed angular correlation, and conversion electron Mossbauer spectroscopy, were employed in the investigation."],["dc.identifier.isi","000172729900018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56526"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Polish Acad Sciences Inst Physics"],["dc.publisher.place","Warsaw"],["dc.relation.conference","36th Zahopane School of Physics International Symosium on Condensed Matter Studies with Nuclear Methods"],["dc.relation.eventlocation","ZAKOPANE, POLAND"],["dc.relation.issn","0587-4246"],["dc.title","Magnetic textures in thin ion-irradiated Ni and Fe films"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3915"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.lastpage","3917"],["dc.bibliographiccitation.volume","84"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.date.accessioned","2018-11-07T10:48:58Z"],["dc.date.available","2018-11-07T10:48:58Z"],["dc.date.issued","2004"],["dc.description.abstract","Bilayers of polycrystalline Co(37 nm)/Fe(37 nm) were deposited onto Si wafers via electron-gun evaporation and irradiated at room temperature with 200 keV Xe+ ions to fluences of 5x10(14)-1x10(16)/cm(2). The magneto-optical Kerr effect, Rutherford backscattering spectroscopy and x-ray diffraction were used to characterize the magnetization and microstructure of the films. Xe fluences of up to 5x10(15) ions/cm(2) were found to induce a four-fold magnetic anisotropy in the originally isotropic films, as a consequence of the phase transformation of hexagonal Co to face-centered-cubic Co caused by ion irradiation. Xe fluences exceeding 7x10(15) ions/cm(2) produced a uniaxial magnetic texture, which is explained by strong Co/Fe interface mixing and possibly ion-induced formation of CoFe grains at the interface. (C) 2004 American Institute of Physics."],["dc.identifier.doi","10.1063/1.1741028"],["dc.identifier.isi","000221210100065"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48322"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","0003-6951"],["dc.title","Interface mixing and phase transformations in Xe-ion-irradiated Co/Fe bilayers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1162"],["dc.bibliographiccitation.journal","Journal of Magnetism and Magnetic Materials"],["dc.bibliographiccitation.lastpage","1163"],["dc.bibliographiccitation.volume","272"],["dc.contributor.author","Zhang, K."],["dc.contributor.author","Gupta, R."],["dc.contributor.author","Lieb, Klaus-Peter"],["dc.contributor.author","Luo, Y."],["dc.contributor.author","Mueller, Gerhard A."],["dc.contributor.author","Schaaf, Peter"],["dc.contributor.author","Uhrmacher, Michael"],["dc.date.accessioned","2018-11-07T10:49:19Z"],["dc.date.available","2018-11-07T10:49:19Z"],["dc.date.issued","2004"],["dc.description.abstract","Rectangular 75 nm thick Co films were irradiated with 200 keV Xe-ions, to fluences of 2.5 x 10(13)-8 X 10(15) ions/cm(2). The film thickness and the implanted Xe profiles, the phase structure and ion-induced lattice dilations as well as the magnetic hysteresis patterns were measured. For lower fluences up to 4 x 10(14) Xe/cm(2), we found predominantly the HCP phase with an in-plane magnetization. The transition to the four-fold in-plane magnetization typical of the FCC phase occurred at a fluence range between 4 x 10(14)/cm(2) and 2 x 10(15)/cm(2). (C) 2004 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jmmm.2003.12.020"],["dc.identifier.isi","000222236700175"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48400"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Conference on Magnetism (ICM 2003)"],["dc.relation.eventlocation","Rome, ITALY"],["dc.relation.issn","0304-8853"],["dc.title","Ion-induced phase transition in thin Co films"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]