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  • 1
    Electronic Resource
    Electronic Resource
    Rotational contour analysis of the ν6a band in the infrared spectrum of pyridine-d5 (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 2102-2109 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100235a016
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  • 2
    Electronic Resource
    Electronic Resource
    Azines: vibrational force field and intensities for pyridine (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 6067-6075 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150668a067
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  • 3
    Electronic Resource
    Electronic Resource
    New vibrational constants for pyridine from low-temperature and high-resolution infrared spectra (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 592-597 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100276a022
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  • 4
    Electronic Resource
    Electronic Resource
    High-field torque magnetometry measurements on Y1.8Er0.2Fe14B (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3778-3778 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y1.8Er0.2Fe14B is an interesting system in that the tendency of the Er ions to order in the basal plane is almost exactly canceled at low temperatures by the uniaxial anisotropy of the iron sublattice.1 We have performed torque magnetometry measurements in all three principal planes of a single crystal of this material at temperatures from 4 to 300 K in magnetic fields up to 60 kG, which is adequate to produce near saturation even in directions away from the principal axes, thus allowing us to determine the magnetocrystalline anisotropy free energy as a function of orientation and temperature. The free energy data were compared with calculations using the full set of crystal field parameters allowed by symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338640
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  • 5
    Electronic Resource
    Electronic Resource
    Sublattice magnetization and spin reorientation in Nd2Fe14B (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3728-3728 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Considerable efforts have recently been made in understanding the magnetic behavior of the rare-earth transition-metal compound Nd2Fe14B, which orders ferromagnetically at Tc=600 K and exhibits a spin-reorientation transition at TSR=135 K. In an effort to obtain direct information on the spin configuration and magnetic ordering in this technologically important compound, we have performed a Nd-145 Mössbauer study on a single crystal of Nd2Fe14B using the 72.5-keV nuclear gamma resonance of Nd-145. The results clearly show that the temperature dependence of the Nd-sublattice magnetization is totally different from that of the macroscopic magnetization, i.e., dropping off far below Tc. The results suggest that the spin-reorientation transition in Nd2Fe14B is driven by an ordering of the Nd sublattice below TSR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340649
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  • 6
    Electronic Resource
    Electronic Resource
    Phase-separated Fe and Co particles in a BN matrix (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3320-3322 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using co-sputtering, 10–300 A(ring) particles of Fe and Co have been prepared in an insulating BN matrix. The Fe particles have the α-Fe structure. The saturation magnetic moment of the iron particles per at. % Fe was found to be approximately independent of the Fe concentration and equal to the value of α-Fe. The system undergoes a metal–nonmetal transition at approximately 40 vol % Fe. For concentrations of Fe particles above this threshold the temperature dependence of the resistivity is metallic and the room-temperature coercivity is large (50–100 Oe). For the Co particles, the room-temperature coercivity is about twice as large as Fe above the metal–nonmetal threshold. Below the metal–nonmetal threshold the particles behave as superparamagnets and the coercivity is approximately zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338977
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic characterization of Zn0.78Fe0.22Se and FeSe films on GaAs (001) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3303-3305 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown single-crystal (001) epilayers of the diluted magnetic semiconductor Zn1−xFexSe with 0≤x≤1 on GaAs(001) substrates by molecular-beam epitaxy. The films retain the zinc-blende structure for thicknesses up to at least 2 μm for x≤0.22, while epilayers with higher Fe concentrations can be stabilized up to some decreasing critical thickness. SQUID magnetometry data obtained for x=0.22 indicate Van Vleck paramagnetic behavior accompanied by a decrease in the fraction of magnetically free Fe2+ ions with increasing x. Conversion electron Mössbauer spectra of the FeSe epilayers show a dominant paramagnetic central peak at both 300 and 13.5 K, with small contributions from Zeeman-split components at low temperature. The samples were further characterized with x-ray rocking curve, θ-2θ, and topography measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340818
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  • 8
    Electronic Resource
    Electronic Resource
    Phase composition of sputtered Fe-SiO2 films (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5855-5855 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on some aspects of a wide-ranging study of the phase separation and properties of sputtered Fe-SiO2 films with Fe volume fractions of 5%–70%. Results of saturation magnetization, electron microscopy and diffraction, Mössbauer effect, and Rutherford backscattering measurements will be presented. We have identified four phases in our films: SiO2, α-Fe, a phase believed to be Si-stabilized amorphous Fe, and a few percent of an Fe compound. For Fe volume fractions below 40%, nearly all of the Fe is present as 10–40 A(ring) particles of the amorphous phase. With increasing Fe content, the volume fraction of α-Fe increases, the fraction of amorphous phase decreases, and the particle sizes increase. Above 50%, α-Fe is the predominant phase. We believe that the relative amounts of crystalline and amorphous iron are related to the occurrence of excess silicon in the films that may arise under some sputtering conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342518
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy energy in single crystal Y1.8Er0.2Fe14B (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3139-3139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There has been considerable interest in tetragonal R2Fe14B compounds as a basis for a new class of permanent magnet materials because of the unusually large energy products they exhibit at room temperature for certain rare-earth substitutions. The origin of the high-energy products is directly related to the large saturation magnetization and magnetic anisotropy energy. The magnetocrystalline anisotropy energy is believed to be directly related to an interaction between the 4f-electrons and the crystal field: however, to date few if any direct comparisons have been made between the experimental magnetic anisotropy and crystal field theory. The reason being that the large anisotropy energy makes it very difficult to use conventional torque magnetometry techniques to determine the angular dependence of the magnetic free energy, particularly at low temperatures where the higher-order terms become important. In this investigation we determine the angular dependence of the magnetic free energy as a function of temperature for Y1.8Er0.2Fe14B using high field (6 T) torque magnetometry techniques and make a direct comparison of the free energy with the energy calculated using a model based on crystal field theory. Y1.8Er0.2Fe14B was chosen because the Fe and Er sublattice anisotropy energies nearly cancel at low temperatures making it possible to measure anisotropy. Excellent agreement was obtained between the model and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340867
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  • 10
    Electronic Resource
    Electronic Resource
    Hyperfine fields and spin orientations in (Fe57/Ag) superlattices from conversion electron Mössbauer studies (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3869-3873 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Conversion electron Mössbauer studies have been carried out as a function of temperature on a series of single-crystal [(100)57Fe/(100)Ag] superlattices grown by MBE on GaAs substrates. The 57Fe layer thickness was varied from approximately 1 to 5.5 ML. From the relative intensity of the Mössbauer lines we show conclusively that the orientation of the magnetic moment for films 2.4 ML and thinner in zero applied field is perpendicular to the film plane at low temperatures. For a 5.5-ML film the spin alignment at room temperature is in the film plane and partially out of the plane at low temperatures. The low-temperature magnetic hyperfine fields are enhanced relative to bulk Fe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340590
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