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Magnetismus Donnerstag MA 20.5 Do 11:15 H10 Proximity effect of vanadium on spin-density wave magnetism in Cr films — •Evgeny Kravtsov 1 , Björgvin Hjörvarsson 2 , Andreas Hoser 3 , Alexei Nefedov 1 , Florin Radu 1 , Arndt Remhof 1 , and Hartmut Zabel 1 — 1 Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universisät Bochum, Bochum — 2 Department of Physics, Uppsala University, Uppsala, Sweden — 3 Institut für Kristallographie, RWTH-Aachen, Aachen Spin-density wave (SDW) state in thin Cr films is known to be under influence of proximity effects from neighboring layers. To date the main attention has been given to effects arising from exchange interactions at interfaces, for example, in Fe/Cr systems, and few papers are devoted to other types of boundary conditions. Here we report on a combined neutron and X-ray scattering study of proximity effects in Cr/V films where the boundary conditions are due to V-Cr hybridization at interfaces. The neutron measurements have been performed at the triple-axis spectrometer UNIDAS in Forschungszentrum Jülich, the synchrotron measurements at the ID20 beamline in ESRF. From the above experiments, we provide evidence that the V/Cr interface causes a strong and long-range influence on the SDWs behavior in Cr. The V-Cr interface hybridization changes the SDW polarisation and propagation direction as well as the SDW period. The Cr magnetic moment in Cr/V bilayers was found to decrease quasi-linearly with temperature that is not observed so far in bulk Cr and other Cr-based thin film systems. The research was supported by SFB 491 and INTAS. MA 20.6 Do 11:30 H10 Thin epitaxial films of the Heusler compound Co2Cr0.6Fe0.4Al — •Gerhard Jakob 1 , Frederick Casper 1,2 , Virginie Beaumont 1,2 , Stefan Falk 1 , Hans-Joachim Elmers 1 , and Claudia Felser 2 — 1 Institut für Physik, Universität Mainz, Staudinger Weg 7, 55099 Mainz — 2 Institut für Anorganische und Analytische Chemie, Universität Mainz, Düsbergweg 10-14, 55099 Mainz A tunnel magnetoresistive element has recently been reported based on thin polycrystalline films of the Heusler compound Co2Cr0.6Fe0.4Al [1]. According to band structure calculations this material is half metallic, i.e. there exists only one spin direction for the charge carriers at the Fermi edge. We prepared thin epitaxial films of this compound in the B2 structure on a-plane (1120) Al2O3 substrates by sputtering. Films grown at high temperatures (T=600 o C) are fully epitaxial with the (110) and (110) planes of the film parallel to the (1120) and (0001) planes of the substrate, respectively. The films show nearly rectangular hysteresis loops with coercitive fields of the order of 10mT. Magnetooptical Kerr measurements show an in-plane anisotropy of the magnetization with the easy axis in {001} direction. Hall measurements show a strong anomalous Hall effect and a weak normal Hall voltage signalling the existence of a compensated Fermi surface. [1] K. Inomata et al., Jpn. J. Appl. Phys. 42, L419 (2003) MA 20.7 Do 11:45 H10 Spin polarization of single-crystalline Co2MnSi films grown by PLD on GaAs(001) — •W. Wang, W. Kuch, L. Chelaru, J. Wang, Y. Lu, J. Barthel, M. Przybylski, and J. Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle Recent theoretical calculations have shown that the full-Heusler alloy Co2MnSi is a promising candidate to be a half-metallic ferromagnet. In this contribution we report on the growth, magnetic and electronic characterization of single crystalline Co2MnSi thin films deposited by Pulsed Laser Deposition (PLD) on GaAs(001) substrates. In situ Reflection High Energy Electron Diffraction (RHEED) and Auger spectroscopy confirmed the high-quality growth (in particular at 450K growth temperatures) and stoichiometry. Spin-resolved photoemission measurements at BESSY-II of the single-crystal Co2MnSi films reveal spin-resolved density of states that are in qualitative agreement with recent band structure calculations. However, the spin polarization of photoelectrons close to the Fermi level is found to be at most 25%, in contrast to the predicted half-metallic behavior. Moreover, the magnetic moments we obtained by sum rule analysis of x-ray magnetic circular dichroism (XMCD) measurements of thin Co2MnSi films are lower in comparison to what is predicted theoretically. We suggest that these discrepancies may be attributed to a non-magnetic surface region and/or partial chemical disorder in the Co2MnSi lattice. MA 20.8 Do 12:00 H10 Resonante magnetische Röntgenstreuung an Co2MnGe- Heusler-Einzelfilmen und -übergittern — •Johannes Grabis, Alexei Nefedov, Andre Bergmann, Kurt Westerholt und Hartmut Zabel — Institut für Experimentalphysik/ Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum Halbmetallische, ferromagnetische Heuslerlegierungen wie Co2MnGe besitzen ein großes Anwendungspotential im Bereich von spinelektronischen Bauelementen. Gesputterte Einzelfilme und Übergitter mit Au oder V als Zwischenschicht wurden mit Hilfe des magnetischen Zirkulardichroismus (XMCD) und der resonanten magnetischen Röntgenstreuung (XRMS) im Bereich der L2,3 Kanten von Co und Mn untersucht. Während anhand der Absorptionsspektren die elemetspezifischen Beiträge zum magnetischen Spin- und Bahnmoment berechnet und die magneto-optischen Konstanten bestimmt werden können, bietet die resonante Röntgenstreuung zusätzlich eine Möglichkeit der tiefenselektiven Analyse der Schichtsysteme. Aus der spekulären Reflektivität kann ein Magnetisierungstiefenprofil gewonnen werden. Die diffuse Streuung liefert weitere Informationen über die Beschaffenheit der Grenzfläche wie Rauhigkeiten und Korrelationslängen. Dieses Projekt wird gefördert durch das BMBF, O3ZAE7BO. MA 20.9 Do 12:15 H10 Magnetische Eigenschaften dünner epitaktischer Cobaltat- und Manganat-Schichten — •Thorsten Schwarz 1,2 , Oswaldo Moran 1 , Dirk Fuchs 1 und Rudolf Schneider 1 — 1 Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe — 2 Universität Karlsruhe, Fakultät für Physik, D-76128 Karlsruhe Mit abnehmender Schichtdicke beobachtet man bei Cobaltat- und Manganat-Schichten eine starke Änderung der magnetischen Eigenschaften. Ferromagnetische Schichten, La0.7A0.3CoO3 (A = Ca, Sr, Ba) und La2/3Ca1/3MnO3, zeigen beispielsweise eine starke Abnahme der Curie- Temperatur mit abnehmender Schichtdicke, was sich mit einem Skalenverhalten sehr gut beschreiben lässt. Weiterhin ist ebenfalls eine Reduktion des effektiven magnetischen Sättigungsmomentes im Vergleich zu Einkristall-Werten erkennbar. Zusätzliche Beiträge zur Anisotropie- Energie aufgrund epitaktischer Verspannungen zeigen einen starken Einfluß auf die Magnetisierungseigenschaften und könnten daher eine zentrale Rolle für dieses Verhalten spielen. Die Schichtpräparation mittels Laserablation sowie die Charakterisierung der strukturellen und magnetischen Eigenschaften mittels Röntgenbeugung und DC-SQUID- Magnetometrie werden vorgestellt und diskutiert. MA 20.10 Do 12:30 H10 Sr2FeMoO6 Thin Film Preparation, Properties and Prospects — •Nicole Auth 1 , Diana Sanchez 2 , and Gerhard Jakob 1 — 1 Johannes Gutenberg Universität, Mainz — 2 Instituto de Ciencia de Materiales de Madrid, CSIC Since the first report of room temperature magneto-resistance in polycrystalline Sr2MoFeO6 (SFMO) this double-perovskite material has been widely studied. Due to its high Curie temperature of 420 K and band structure calculations predicting 100% spin polarisation, SFMO is a potential candidate for spintronic devices. Yet most studies are concerned with bulk material while the preparation of good quality thin films has proven to be a non-trivial task. We prepared epitaxial thin films of SFMO on SrTiO3 (100) substrates by pulsed laser deposition. Differing from previous reports a postdeposition annealing step in vacuum with a low oxygen partial pressure was introduced. The structural, magnetic and transport properties are studied in detail. We also investigated film growth on a Ba0.4Sr0.6TiO3 (BST) buffer layer and on DyScO3 substrates. Both types of seed crystals offer a nearly perfect lattice match for the formation of the SFMO thin film. While the DyScO3 substrate has a perfect c-axis orientation the BST buffer layer exhibits a large angular spread of the crystallites leading to a clear change in the magneto-transport properties. We succeeded in growing samples with comparably smooth surface as a prerequisite for multilayer preparation. For studying the TMR effect we are working on nanoscale patterning of mesa-structures by a combination of photolithography, focussed ion beam etching and e-beam lithography.
Magnetismus Donnerstag MA 20.11 Do 12:45 H10 Epitaxial growth and ferroelectric and ferromagnetic properties of La0.7Sr0.3MnO3 / Pb(Zr,Ti)O3 bilayers — •C. Thiele, K. Dörr, T. Walter, K.-H. Müller, and L. Schultz — IFW Dresden, Postfach 270116, 01171 Dresden Magnetic and electrical properties of ferromagnetic manganites crucially depend on lattice constants. Thus, it was suggested to control epitaxial strain of thin films using the piezoeffect of a Pb(Zr,Ti)O3 (PZT) toplayer [1]. Thereby, it seems possible to modify the resistivity in a wide temperature range including 300 K, the magnetoresistance and magne- MA 21 Bio- und molekularer Magnetismus tization behavior of the ferromagnetic films. Pulsed laser deposition has been utilized to investigate the growth of La0.7Sr0.3MnO3 / PZT bilayers on single-crystalline substrates in order to obtain high structural quality and undisturbed magnetic / ferroelectric properties. We discuss measurements of resistance, magnetization and ferroelectrical polarization in relation to the stoichiometry and microstructure of the bilayers. The latter was investigated by x-ray diffraction, atomic force microscopy and x-ray photoelectron spectroscopy. This work is supported by DFG, FOR 520. [1] H. Tabata et al., IEICE Trans. Electron. E80-C, 918 (1997). Zeit: Donnerstag 10:15–12:15 Raum: H22 MA 21.1 Do 10:15 H22 Physics of a new copper-based triangular chain — •Jürgen Schnack 1 , Hiroyuki Nojiri 2 , Paul Kögerler 3 , and Leroy Cronin 4 — 1 Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany — 2 Dept. of Physics, Okayama University, Tsushimanaka 3-1-1, Okayama, 700-8530 Japan — 3 Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA — 4 Dept. of Chemistry, The University of Glasgow, Glasgow, G12 8QQ, UK We report the synthesis and magnetic characterization of a new class of one-dimensional chains of antiferromagnetically coupled copper triangles. Since the copper triangles are coupled via hydrogen bonds, which naively are assumed to be weak exchange pathways, one expects that the chain shows a pronounced plateau at 1/3 of the saturation magnetization. The high field magnetization curve shows, however, no plateau. The observed magnetization and susceptibility curves are successfully interpreted by a theoretical model, in which the inter- and intra-triangle exchange parameters are of similar size. In effect the infinite chain turns out to be an interesting example of a frustrated spin system with competing interactions. MA 21.2 Do 10:30 H22 High-field magnetization study of the S = 1/2 antiferromagnetic Heisenberg chain [PM Cu(NO3)2(H2O)2]n with field-induced gap — •S. Süllow 1 , A.U.B. Wolter 1 , H. Rakoto 2 , M. Costes 2 , A. Honecker 3 , W. Brenig 3 , A. Klümper 4 , H.-H. Klauss 1 , F.J. Litterst 1 , R. Feyerherm 5 , and D. Jérome 6 — 1 IMNF, TU Braunschweig, Braunschweig — 2 Laboratoire National des Champs Magnétique Pulsés, Toulouse, France — 3 ITP, TU Braunschweig, Braunschweig, — 4 FB Physik, Bergische Universität Wuppertal, Wuppertal — 5 HMI GmbH, Berlin — 6 Université Paris-Sud, Orsay We present a high-field magnetization study of the S=1/2 antiferromagnetic Heisenberg chain [PM Cu(NO3)2(H2O)2]n. For this material, as result of the Dzyaloshinskii-Moriya interaction and a staggered g-tensor, the ground state is characterized by an anisotropic field induced spin excitation gap and a staggered magnetization. Our data reveal the qualitatively different behaviour in the directions of maximum and zero spin excitation gap. The data are analyzed via exact diagonalization of a linear spin chain with up to 20 sites and on basis of the Bethe ansatz equations, respectively. For both directions we find very good agreement between experimental data and theoretical calculations. We extract the magnetic coupling strength J/kB along the chain directions to 36.3(5) K and determine the field dependence of the staggered magnetization component ms. This work has partially been supported by funds of the European contract no. HPRI-CT-1999-40013 and by the DFG under contract no. SU229/6-1. MA 21.3 Do 10:45 H22 Observation of a transverse magnetization in the S=1/2 antiferromagnetic chain [PM·Cu(NO3)2·(H2O)2]n by 13 C-NMR — A.U.B. Wolter 1 , P. Wzietek 2 , D. Jerome 2 , S. Süllow 1 , F.J. Litterst 1 , A. Honecker 3 , W. Brenig 3 , R. Feyerherm 4 , and •H.-H. Klauss 1 — 1 Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig — 2 Laboratoire de Physique des Solides, Universite Paris-Sud, Orsay, France — 3 Institut für Theoretische Physik, TU Braunschweig — 4 Hahn-Meitner-Institut, Berlin We present 13 C-NMR studies of the static and dynamic magnetic properties of the S=1/2 antiferromagnetic chain [PM·Cu(NO3)2·(H2O)2]n. In this system the spin-orbit interaction gives rise to an anisotropic magnetic field induced spin excitation gap. The microscopic model used to describe the thermodynamic properties (M. Oshikawa and I. Affleck, PRL 79 2883) proposed the existence of a staggered magnetization component transverse to the applied field which cannot be measured macroscopically. We measured the local susceptibility via the NMR frequency shift at three different carbon sites in the pyrimidine molecule as a function of temperature and magnetic field orientation. The transverse staggered magnetization is identified as a low temperature deviation from the linear correlation between local and global susceptibility. The observed magnitude and temperature dependence are consistent with the theoretical model. The spin excitation gap is determined from the temperature dependence of the T1 relaxation rate. These measurements reveal additional excitations in the gap. MA 21.4 Do 11:00 H22 Charge-induced modulation of magnetic interactions in a [2 × 2] metallo-organic grid-complex — •Christian Romeike 1 , Maarten R. Wegewijs 1 , Wolfgang Wenzel 2 , and Herbert Schoeller 1 — 1 Institut für Theoretische Physik A, RWTH Aachen, 52045 Aachen — 2 Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe We study the electronic spin and charge degrees of freedom of a [2×2]transition metal-grid complex cation at different stages of its reduction[1] in a phenomenological low temperature model. We show that extra electrons on the bridging ligands can drastically change the coupling of the spins on the metal sites and lead to maximal total spin states of the molecular complex (spin of unpaired electrons on the metals and ligands) due to the Nagaoka mechanism [2]. For a low-spin Fe 2+ -[2×2]-grid electrons can move between the ligands using an empty orbital on the metal as a bridge. In contrast to this, for a low-spin Co 2+ -[2 × 2]-grid the metal bridge contains a localized electron which can interact or exchange with the passing electrons. The presence of a localized spin on each bridging metal-ion in the case of Co 2+ has two main effects: (1) the total spin achievable in the fully polarized Nagaoka state is larger and (2) the threshold Coulomb interaction required to achieve this state can be diminished to values close to those of Fe only if direct exchange coupling between the metal-ions and ligands is taken into account. It has to be of the same order as the exchange coupling obtained in perturbation theory. [1] M.Ruben et al., Chem.Eur.J. 2003, 9, No.1 [2] Y. Nagaoka, Phys. Rev.147, 392 (1966) MA 21.5 Do 11:15 H22 Magnetic correlations in oxalate spin ladders — •C. Mennerich 1 , M. Bröckelmann 1 , J. Kreitlow 1 , A. Wolter 1 , S. Süllow 1 , F.J. Litterst 1 , R. Klingeler 2 , B. Büchner 2 , D.-J. Price 3 , and H.-H. Klauss 1 — 1 Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig — 2 Leibniz-Institut für Festkörperund Werkstoffforschung, Dresden — 3 Department of Chemistry, Univ. of Southampton, United Kingdom We present studies of the magnetic behaviour in the isostructural spin ladder materials Na2T2(C2O4)3(H2O)2 with T= Ni, Co, Fe, Mn (J. Chem. Soc., Dalton Trans. 2000, 3566 ). Here the oxalate (C2O4) 2− molecule acts as the bridging element in the rungs and legs of the transition metal ladder. We performed magnetic susceptibility and high field magnetization as well as Moessbauer spectroscopy (Fe system only). The susceptibility of all systems shows a pronounced maximum between 10 and 25 K indicating an antiferromagnetic interaction. The data can be described using a dimer model representing two metal centers in the 2+ high spin state with a dominant magnetic interaction along the rungs of the ladder. An
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Tiefe Temperaturen Donnerstag non-G
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Tiefe Temperaturen Donnerstag sowie
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Tiefe Temperaturen Freitag TT 31 Su
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Tiefe Temperaturen Freitag Näherun
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Vakuumphysik und Vakuumtechnik Tage
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Vakuumphysik und Vakuumtechnik Mont
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Ausschuss Industrie und Wirtschaft
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Arbeitskreis Biologische Physik Tag
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Arbeitskreis Biologische Physik Tag
Page 433 and 434:
Arbeitskreis Biologische Physik Mon
Page 435 and 436:
Arbeitskreis Biologische Physik Die
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Arbeitskreis Biologische Physik Don
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Arbeitskreis Biologische Physik Fre
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Page 457 and 458:
Page 459 and 460:
Arbeitskreis Physik sozio-ökonomis
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Page 463 and 464:
Page 465 and 466:
Page 467 and 468:
Symposium Fat-Tail Distributions -
Page 469 and 470:
Symposium Life Sciences on the Nano
Page 471 and 472:
Page 473 and 474:
Page 475 and 476:
Page 477 and 478:
Page 479 and 480:
Page 481 and 482:
Page 483 and 484:
Symposium Non-Fermi Liquids in Quan
Page 485 and 486:
Symposium Functional Nanoparticles
Page 487 and 488:
Symposium Organic and Hybrid System
Page 489 and 490:
Page 491 and 492:
Page 493 and 494:
Page 495 and 496:
Page 497 and 498:
Page 499 and 500:
Page 501 and 502:
Page 503 and 504:
Page 505 and 506:
Page 507 and 508:
Symposium Physics of Foams Mittwoch
Page 509 and 510:
Symposium Physics of Foams Mittwoch
Page 511 and 512:
Symposium Quantum Shot Noise in Nan
Page 513 and 514:
Symposium X-RAY Magneto-Optics Tage
Page 515 and 516:
Symposium X-RAY Magneto-Optics Dien
Page 517 and 518:
Lehrertage Regensburg Hauptvorträg
Page 519 and 520:
A. D., Mirlin .................HL 1
Page 521 and 522:
Breidenbach, Boris ........ AKB 50.
Page 523 and 524:
Elli, Alexandra .............SYLS 3
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Greer, Lindsay ......... M 9.1, M 1
Page 527 and 528:
Horn-von Hoegen, M. O 13.2, O 14.40
Page 529 and 530:
Korn, Tobias ...............MA 13.6
Page 531 and 532:
Martin, Tobias ............. MA 13.
Page 533 and 534:
Partyka, Ewa ................ M 18.
Page 535 and 536:
Rugeramigabo, Eddy Patrick O 14.38,
Page 537 and 538:
Sihler, J. .................... DS
Page 539 and 540:
Volz, K. .................... HL 44
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