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Author: Wolf, M. × Start date: 1984 ×

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    Short Communication: the Influence of Air-Abrasive Trimming on the Current Noise of Thick Film Resistors
    (London [u.a.] : Gordon & Breach, 1984) Wolf, M.
    [No abstract available]
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    On Experimental Data of the Tcr of Tfrs and Their Relation to Theoretical Models of Conduction Mechanism
    (London [u.a.] : Gordon & Breach, 1985) Storbeck, I.; Wolf, M.
    Any theory of electrical conduction in TFRs encounters mainly two problems: (i) explanation of the dependence of R□ on properties of conducting component (volume fraction, grain size, resistivity), (ii) explanation of the temperature dependence of R□ taking into account (i). In order to achieve this one has to fit some microscopic parameters to experimental R□-and TCR-values, and to check if they are reasonable or not. The aim of the following discussion is to show, that such a fitting by means of experimental TCR-values is not correct. This is due to the fact that TCR-behaviour, as is well known, is determined also by the dependence of resistivity on strain. But any theoretical model neglects strains, also those who are induced by thermal strains. By means of published experiments concerning the strain dependence of resistance, the magnitude is estimated by which the TCR-values have to be corrected for the described fit.
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    Terahertz spin currents and inverse spin Hall effect in thin-film heterostructures containing complex magnetic compounds
    (Singapore [u.a.] : World Scientific Publishing, 2017-08-23) Seifert, T.; Martens, U.; Günther, S.; Schoen, M.A.W.; Radu, F.; Chen, X.Z.; Lucas, I.; Ramos, R.; Aguirre, M.H.; Algarabel, P.A.; Anadón, A.; Körner, H.; Walowski, J.; Back, C.; Ibarra, M.R.; Morellón, L.; Saitoh, E.; Wolf, M.; Song, C.; Uchida, K.; Münzenberg, M.; Radu, I.; Kampfrath, T.
    Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin–orbit interaction at highest frequencies, but has also paved the way for applications such as efficient and ultrabroadband emitters of terahertz (THz) electromagnetic radiation. So far, predominantly standard ferromagnetic materials have been exploited. Here, by introducing a suitable figure of merit, we systematically compare the strength of THz emission from X/Pt bilayers with X being a complex ferro-, ferri- and antiferromagnetic metal, that is, dysprosium cobalt (DyCo5), gadolinium iron (Gd24Fe76), magnetite (Fe3O4) and iron rhodium (FeRh). We find that the performance in terms of spin-current generation not only depends on the spin polarization of the magnet’s conduction electrons, but also on the specific interface conditions, thereby suggesting TES to be a highly interface-sensitive technique. In general, our results are relevant for all applications that rely on the optical generation of ultrafast spin currents in spintronic metallic multilayers.