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  • 1
    Electronic Resource
    Electronic Resource
    Formation of ferromagnetic iron nitrides in iron thin films by high-dose nitrogen ion implantation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4357-4361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Synthesis of thin films of Fe16N2 has been investigated by use of a high-dose nitrogen ion implantation into thin iron films. Nitrogen molecular ions of N+2 were accelerated to 150 keV and implanted into α-iron films with a thickness of 200 nm. As a result of an implantation with the dose of 4.0×1016 (N2/cm2), 35% of the α-Fe was transformed into an iron nitride with a body-centered-tetragonal (bct) structure. The c axis of the bct lattices was oriented perpendicularly to the film plane. It was found that nitrogen implantation into iron films gives rise to both an increase in the spontaneous magnetization and a perpendicular anisotropy. These facts are explained on the basis of the bct nitride formation and the c-axis orientation. Conversion electron Mössbauer spectroscopy was used to study hyperfine structures and magnetic properties of the implanted films. Three different Fe sites corresponding to the bct nitride were recognized in a spectrum of the implanted film. The maximum hyperfine field was 372.8 kOe at room temperature which is ascribed to the second-nearest-neighbor Fe sites for the nitrogen atoms. It was deduced that the bct iron nitride has an ordered structure analogous to Fe16N2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343272
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties and Mössbauer spectra of sputtered Fe-Al-Si-Ni supersendust films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7207-7214 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe-Al-Si-Ni supersendust films containing 2.7 at. % Ni atoms with a thickness of 1 μm were deposited on crystallized-glass substrates by rf planar magnetron sputtering, and the changes in magnetic properties and structure due to the sputtering conditions and annealing were examined. The films with excellent soft magnetic properties and high magnetic-flux density which are good candidates for new recording-head materials were obtained by annealing as-deposited films at 500 °C. It was found through conversion electron Mössbauer spectroscopy (CEMS) that the disordered structure of α type in as-sputtered films transformed into the ordered structure consisting of a mixture of B2 and DO3 types at the temperature of 500 °C. The CEMS studies also revealed that Ni atoms are located at the corner in the bcc structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347614
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  • 3
    Electronic Resource
    Electronic Resource
    Mössbauer study on Fe16N2 films prepared by ion-implant nitrification of iron films : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6033-6035 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mössbauer spectroscopy was carried out to elucidate the magnetic structure of Fe16N2 with the giant magnetization. Samples were prepared by ion-implant nitrification of single-crystal iron films, followed by an annealing at 150 °C for 60 h. The nitrification developed three Fe atom environments, attributable to three different Fe sites in Fe16N2 structure. The magnetic moments of the first, second, and third nitrogen neighbor Fe atoms were determined to be 1.3, 2.5, and 3.8 μB, respectively. The quadrupole effect in Fe16N2 was interpreted consistently on the basis of the consideration that the magnetization is directed along [001] and nitrogen atoms had a negative charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350084
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  • 4
    Electronic Resource
    Electronic Resource
    Large magnetization induced in single crystalline iron films by high-dose nitrogen implantation (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 92-94 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nitrogen ions were implanted in 200-nm-thick single crystalline iron films for a stoichiometric concentration of Fe16 N2 (11.1 at. %) by way of a multiple implantation. X-ray diffraction revealed that the as-implanted films were composed of 70% nitrogen martensite and 30% residual α-Fe. A slight amount of α‘-martensite, that is, Fe16 N2, was detected but the principal constituent of the nitrogen martensite was α'-martensite. The saturation magnetic moment increased by 13.4 % with the implantation. Annealing the implanted films at 150 °C for 2 h in vacuum resulted in an increase in a constituent of the α‘ phase, but affected the magnetic moment only slightly. It was deduced that the saturation magnetization of the nitrogen martensite is ∼257 emu/g at room temperature. It was also found that the implantation induced a perpendicular magnetic anisotropy due to the characteristics of the nitrogen martensite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102614
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrogen-implantation-induced transformation of iron to crystalline Fe16N2 in epitaxial iron films (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2536-2538 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystalline phase Fe16 N2 has been found in nitrogen-implanted epitaxial iron films on mirror-polished (100) MgO substrates. Implantations of N+2 at an acceleration voltage of 140 keV transformed the bcc iron into a partially ordered nitrogen martensite with a body-centered-tetragonal (bct) structure. The amount of the ordered part was increased to some extent by an annealing treatment in vacuum at 150 °C for 2 hr. An implantation with a dose of 4×1016 N2/cm2 transformed 60% iron in a film into the bct martensite. The constituent of the ordered phase (Fe16 N2 ) in the bct martensite was 16 wt. %. After the annealing, the constituent increased to 24%. It is proposed that a formation of lower temperature and metastable compound such as Fe16 N2 can be made available through energetic ion implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101543
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  • 6
    Electronic Resource
    Electronic Resource
    An oxygen sensitive ZnO-SiO2-Au device using photodesorption of oxygen (1990)
    Springer
    Journal of materials science 25 (1990), S. 2958-2962 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A significant breakdown of the rectification characteristic of the ZnO-Si02-Au device occurs with UV irradiation and is enhanced with increasing light intensity and a reverse bias voltage at which the device is kept under UV irradiation. Complex impedance plots of the device reveal that an increase in leakage current observed after UV irradiation is mainly due to a decrease in the barrier height. The magnitude of breakdown and recovery of the rectification characteristic is dependent on the ambient partial pressure of oxygen. The variation of the barrier height is explained by oxygen desorption under UV illumination and by oxygen adsorption in the dark.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584911
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  • 7
    Electronic Resource
    Electronic Resource
    Polymorphic Transformation of Sodium Orthoferrites (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 363 (1968), S. 222-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die polymorphe Umwandlung zwischen α- und β-NaFeO2, die vom rekonstruktiven Typ ist (Änderung der ersten Koordinationssphäre), ist reversibel und wird durch geeignete Lösungsmedien katalysiert.
    Notes: The polymorphic transformation between α-and β-NaFeO2, which is of a reconstructive type involving the disruption of the first coordination, is fairly reversible and catalysed by dissolution media.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19683630317
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