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Göteborgs universitets publikationer - e-publicering och e-arkiv
Institutional Repository
47 Publications
OpenAIRE 2.0 (EC funding)
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  • Thickness-and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films

    Haidar, Mohammad; Ranjbar, Mojtaba; Balinsky, Michael; Dumas, Randy K.; Khartsev, S.; Åkerman, Johan (2015)
    Projects: EC | MUSTANG (307144)
    The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the fil...

    CoFeB-Based Spin Hall Nano-Oscillators

    Ranjbar, Mojtaba; Dürrenfeld, Philipp; Haidar, Mohammad; Iacocca, Ezio; Balinsky, Michael; Le, T.Q.; Fazlali, M.; Houshang, Afshin; Awad, Ahmad; Dumas, Randy K.; Åkerman, Johan (2014)
    Projects: EC | MUSTANG (307144)
    We demonstrate magnetization auto-oscillations driven by pure spin currents in spin Hall nano-oscillators based on CoFeB/Pt bilayers. Despite the very low anisotropic magnetoresistance of CoFeB, a substantial microwave signal power can be detected, even at room temperature, indicating that a sizable spin wave amplitude is generated. Spin torque ferromagnetic resonance measurements reveal that the generated auto-oscillation frequency lies below the ferromagnetic resonance frequency of CoFeB an...

    Tunable permalloy-based films for magnonic devices

    Yin, Yuli; Pan, Fan; Ahlberg, Martina; Ranjbar, Mojtaba; Dürrenfeld, Philipp; Houshang, Afshin; Haidar, Mohammad; Bergqvist, Lars; Zhai, Ya; Dumas, Randy K.; Delin, Anna; Åkerman, Johan (2015)
    Projects: EC | MUSTANG (307144)
    Using both broadband ferromagnetic resonance (FMR) spectroscopy and ab initio calculations, we study the magnetodynamic properties of permalloy (Py, Ni80Fe20) and Py100-x M-x films with M as platinum (Pt), gold (Au), or silver (Ag). From the uniform FMR mode, we extract the saturation magnetization (M-S), damping (alpha), and inhomogeneous broadening (Delta H-0); from the first perpendicular standing spin-wave (PSSW) mode, we extract the exchange stiffness (A). M-S and A are found to decrease...

    Initial DNA Interactions of the Binuclear Threading Intercalator &#x39B;,&#x39B;-[&#x3BC;-bidppz(bipy)<sub>4</sub>Ru<sub>2</sub>]<sup>4+</sup>: An NMR Study with [d(CGCGAATTCGCG)]<sub>2</sub>

    Wu, Lisha; Reymer, Anna; Persson, Cecilia; Kazimierczuk, Krzysztof; Brown, Tom; Lincoln, Per; Nordén, Bengt; Billeter, Martin (2013)
    Projects: EC | SUMO (227700)
    Binuclear polypyridine ruthenium compounds have been shown to slowly intercalate into DNA, following a fast initial binding on the DNA surface. For these compounds, intercalation requires threading of a bulky substituent, containing one RuII, through the DNA base-pair stack, and the accompanying DNA duplex distortions are much more severe than with intercalation of mononuclear compounds. Structural understanding of the process of intercalation may greatly gain from a characterisation of the i...

    The nature of [N-Cl-N]+ and [N-F-N]+ halogen bonds in solution

    Karim, Alavi; Reitti, Marcus; Carlsson, Anna-Carin; Gräfenstein, Jürgen; Erdelyi, Mate (2014)
    Projects: EC | HALOGEN (259638)
    Halonium ions are synthetically useful, transient species that may be stabilized by attachment to two electron donors. Whereas studies of [C–X–C]+-type ions have greatly contributed to the fundamental understanding of chemical bonding and reaction mechanisms, investigations of the corresponding [N–X–N]+ halogen bond complexes are only at an early stage. Herein we present solution NMR spectroscopic and theoretical evidence for the nature of [N–Cl–N]+ and [N–F–N]+ complexes, and we discuss thei...
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