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  • 1995-1999  (4)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    An autonomous programmable system for Mössbauer spectroscopy, accessed by a PC program (1997)
    Springer
    Hyperfine interactions 110 (1997), S. 135-141 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A low cost, stand alone microprocessed equipment for data acquisition and driver control, designed under the requirements of Mössbauer spectroscopy is described. It has a functional mode as pulse analyzer (PHA) and a second mode as a multichannel analyzer (MCA) while it generates waveforms -- triangular, sawtooth and sinusoidal -- between 2 and 40 Hz, buffered up to a capacity of 750 mA for velocity transducer (DRIVER) management, with PID signal synthesizer and error minimization circuits. Its resolution is variable, between 2 and 1024 channels. The system has CMOS technology of integration, Z-80--74HC, with a 4.9152 MHz crystal time based; its dead time is of 0.61 μs and its minimum dwell time is of 32 μs. Data are continuously kept in memory and can be transferred, under a managing program request, via RS-232c protocol at 9600 BAUD -- to a PC computer for its analysis and display. The program written for a PC is able to distinguish up to 8 different spectrometers by means of an identity number assigned to each unit. Therefore, the serial input may be multiplexed in order to attend all the systems, that can work simultaneously.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012650710935
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  • 2
    Digitale Medien
    Digitale Medien
    Study of ferrofluids by Mössbauer spectroscopy (1998)
    Springer
    Hyperfine interactions 113 (1998), S. 507-515 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The parameters of the log‐normal size distribution of a MnFe2O4 ferrofluid powder sample have been determined by X‐ray diffraction. The mean blocking temperature was determined from the maximum of Xi . Mössbauer spectra at 4.2–300 K are interpreted by a new simple theory of superparamagnetism and taking a reduction of the internal magnetic field for small particles, a size dependence of the anisotropy constant, the size distribution and collective excitations into account.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012616909485
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  • 3
    Digitale Medien
    Digitale Medien
    Simple theory of superparamagnetism and spin-tunneling in Mössbauer spectroscopy (1997)
    Springer
    Hyperfine interactions 110 (1997), S. 127-134 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The magnetic relaxation of isolated small (〈 100 Å) monodomain magnetic particles is due to superparamagnetic relaxation (predominant at high temperatures) and eventually quantum tunneling of the magnetic moment (at low temperatures). The superparamagnetic relaxation process can be formally described by an (multiple phonon absorption and emission) Orbach process with an anisotropy Hamiltonian due to crystalline or form anisotropy \widehatIon = S2 z and a usual dynamical spin-Hamiltonian for the spin--phonon interaction. From this Mössbauer spectra can be calculated using ab-initio or stochastic methods. Phonon-assisted tunneling and its influence on Mössbauer spectra are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012654811844
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  • 4
    Digitale Medien
    Digitale Medien
    Magnetic properties of Y(Fe0.95Mn0.05)2 compound (1999)
    Springer
    Hyperfine interactions 122 (1999), S. 209-215 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Mössbauer spectroscopy, magnetization and X-ray diffrraction measurements of the ternary compound Y(Fe0.95Mn0.05)2 prepared by melting were performed in order to investigate the effect of the substitution of Mn on the magnetic properties of YFe2. The experimental results show change of the lattice parameter. The magnetization and the Curie temperature decrease with substitution of Fe by Mn.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012618327851
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