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  • 11
    Electronic Resource
    Electronic Resource
    Magnetic properties of Y(Fe0.95Mn0.05)2 compound (1999)
    Springer
    Hyperfine interactions 122 (1999), S. 209-215 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012618327851
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  • 12
    Electronic Resource
    Electronic Resource
    Hyperfine structure of LiNbO3:57Fe(III) (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 837-840 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lithium niobate monocrystals exhibit many interesting physical phenomena such as ferro-, piezo- and pyroelectricity, low acoustical losses, small optical absorption in the visible region and, especialy after doping with small amounts of transition metal ions, strong photorefraction and photovoltaic effects [1–3]. According to the multitude of the properties there are numerous applications of LiNbO3 for e.g. light modulation, Q-switch, second harmonic generation, fibre optics, acoustic transducers, pyroelectric detectors and holographic data storage. In order to understand in detail the microscopic mechanisms of the bulk photovoltaic effect and the photorefraction, which are strongly enhanced by doping the crystals with iron, an exact knowledge of the not yet unambigously known lattice site and the charge compensation [4,5] as well as the electronic structure of the iron impurities is indispensable. Here the Mössbauer investigation of the hyperfine interaction of57Fe ions probing the crystal field may contribute to clarification. As can be seen from the isomer shift iron enters the LiNbO3-lattice as Fe(II) or Fe(III) [5]. By annealing the samples in oxydizing atmospheres (e.g. ≈p24 hours in air ≈p600
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147377
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  • 13
    Electronic Resource
    Electronic Resource
    Mössbauer relaxation spectra of LiNbO3: Fe(III) (1988)
    Springer
    Hyperfine interactions 42 (1988), S. 1067-1070 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of LiNbO3: Fe(III)-monocrystals were measured in zero external magnetic field (5mK to 673K). They all show typical lineshapes due to relaxation effects. Below 77K temperature independent and above 77K a temperature-dependent relaxation is observable. In spectra measured in external magnetic fields relaxation effects occur only above 77K. We present least square fits of spectra measured at 300K and external magnetic fields using symmetry invariant reservoir spectral densities. The applied numerical formalism takes the complete electronuclear manifold of57Fe(III) into account. We discuss the problems concerning the interpretation of zero field spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395575
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  • 14
    Electronic Resource
    Electronic Resource
    Texture analysis by Mössbauer spectroscopy (1991)
    Springer
    Hyperfine interactions 67 (1991), S. 695-699 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The expressions for line intensities in spectra recorded with polarized γ-rays are reviewed. A density matrix formalism is used. The texture function is expanded in sphericals harmonics and the intensities are calculated for a rotated thin absorber and polarized source. A corresponding expeimental setup was developed. From measurements with videotapes the texture function was determined for demagnetized and magnetized tapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398221
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  • 15
    Electronic Resource
    Electronic Resource
    Field and temperature dependence of electronic states populations and spin relaxation in Mössbauer absorption spectra of LiNbO3:57Fe(III) (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 1133-1136 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single crystal LiNbO3:57Fe(III) Mössbauer absorption spectra at 3 Tesla and 120...300K can be fitted using a dynamical spin Hamiltonian according to spin-lattice relaxation. At high fields (0.9...7 Tesla) and 4.2K the spectra can be fitted using an electronuclear spin Hamiltonian. The area of the subspectra due to each electronic state is not in accordance with a Boltzmann distribution at the bath temperature. From the population we calculate spin temperatures which depend linearly on the external magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397529
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  • 16
    Electronic Resource
    Electronic Resource
    Gamma to alpha phase transformation in FeCoV alloys (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 231-234 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effects of filing FeCoV alloys with equiatomic FeCo and up to 14 at% V is studied by Mössbauer spectroscopy and X-ray diffraction. We observed that filing eliminates the paramagnetic component observed in samples in the form of plates. The filed material also presents a linear increase of the lattice parameter and a linear decrease of the average hyperfine field of the alpha phase due to extra low-field satellites with increasing vanadium contents. This indicates that filing produces a gamma to alpha phase transformation, which increases the amount of vanadium in solid solution in the FeCo alpha phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074277
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  • 17
    Electronic Resource
    Electronic Resource
    Fast relaxation of polycrystalline Fe(III) complexes studied by Mössbauer spectroscopy (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 399-406 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of polycrystalline samples of Fe(Ox)3, Fe(BPHA)3 and K3[Fe(malonate)3] · 3H2O exhibit fast relaxation patterns in the temperature range 4.2–300 K. The magnetic hyperfine splitting has nearly completely collapsed due to rapid electronic spin-spin relaxation of the Fe ions. We use a static Hamiltonian $$\mathcal{H}_q = P[3I_z^2 - I(I + 1) + \eta (I_ + ^2 + I_ - ^2 )/2]$$ and describe the spin-spin interaction by an effective field Hamiltonian $$\mathcal{H}_{bi} \mu _n g_n H \cdot I$$ . From this the relaxation supermatrix and the Mössbauer spectra are calculated. The random texture of the samples is taken into account by averaging the radiation dipole operators over the whole sphere. Least-squares fits of the spectra for longitudinal, isotropic and transverse spin relaxation are presented. From the fits the temperature dependence of the relaxation is obtained. We conclude that in these materials the iron is present as high-spin Fe(III) and that the crystal field splitting constantD is greater than zero. The sign ofV zz is found to be positive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074307
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  • 18
    Electronic Resource
    Electronic Resource
    Mössbauer and EPR study of nitrosyl hemoglobin (1994)
    Springer
    Hyperfine interactions 91 (1994), S. 797-802 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nitrosyl hemoglobin was prepared by bubbling fresh57Fe-enriched rat hemoglobin with NO. S- and X-band EPR spectra at 77 K are typical for anS=1/2 system with an anisotropicg-tensor and exhibit hyperfine interactions of14N with the electronic spin. Mössbauer spectra at 4.2 and 100 K consist of a superposition of spectra from high- and low-spin Fe(III), deoxygenated hemoglobin and a component corresponding toS=1/2,g=2, hyperfine constantsA xx /g n Β n =A yy /g n Β n =−19.6 T,A zz /g n Β n =6.8 T, quadrupole splitting δE Q=1.5 mm s−1, isomer shiftI s=0.42 mm s−1 and linewidth 0.4 mm s−1. The spin-lattice relaxation rate at 100 K is 〈2×106 s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064609
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  • 19
    Electronic Resource
    Electronic Resource
    Local magnetic properties of ultrathin ferromagnetic fcc-Fe-films on Cu(001) (1994)
    Springer
    Hyperfine interactions 92 (1994), S. 1297-1301 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Conversion electron Mössbayer spectroscopy (CEMS) on three monolayers (ML) thick metastable fcc-Fe(001) films grown epitaxially on a Cu(001) substrate under different conditions shows that these films are characterized by a distributionP(B hf) of magnetic hyperfine fieldsB hf. The vast majority of57Fe nuclei experience relatively large hyperfine fields at low temperature. The temperature dependence of the most probable fieldB peak was found to follow aT 3/2 spin-wave law below 300 K. It is shown from the relative line intensities that preferential Fe spin orientation perpendicular to the film plane exists in films grown at ∼120 K, while preferential in-plane spin orientation is found for a growth temperature of ∼300 K. Coating a low-temperature grown Fe film by ∼2 ML of Cu(001) drastically reduces the hyperfine field, in contrast to the case of room-temperature grown Cu-coated films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065770
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  • 20
    Electronic Resource
    Electronic Resource
    Evidence for fast diffusion of57Fe implanted in cu from depthselective conversion-electron Mössbauer spectroscopy (DCEMS) (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 383-386 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The DCEMS technique has been applied to observe drastic changes with time of the ion-implanted57Fe concentration profilein a Cu foil. Spectral changes observed at selected electron energies may be related to changes as a function of depth in the57Fe local surroundings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159773
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