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  • 1985-1989  (27)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Giant magnetic coercivity and percolation effects in granular Fe-(SiO2) solids (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1280-1282 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate a novel method for enhancing the coercivity of magnetic materials. Granular Fe-(SiO2) solids have been fabricated over a wide volume fraction range from 15% to 100%. Giant magnetic coercivity, as high as 2500 Oe, has been observed in granular solids in which the isolated Fe granules are only nanometers in size. Across the whole volume fraction range magnetic coercivity experiences dramatic variations due to the change of granular size and percolation effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98705
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  • 2
    Electronic Resource
    Electronic Resource
    Granular metal films as recording media (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 512-514 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-density recording media require materials with a high magnetization and high coercivity as well as chemical stability, wear, and corrosion resistance. We explore the potential of granular metal films for recording media. Films of Fe granules about 150 A(ring) in size embedded in an amorphous SiO2 matrix exhibit coercivities as high as 3 kOe at low temperatures and 1.1 kOe at room temperature, and magnetizations of about 150 emu/g. The methods with which these materials are fabricated, the essential microstructure characterization, and magnetic measurements are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99402
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of noble metal buffer layers on superconducting YBa2Cu3O7 thin films (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2155-2157 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting YBa2Cu3O7 thin films have been prepared by using a magnetron sputtering system in the single-source mode. Samples deposited on [100] single-crystal MgO with and without a Au buffer layer all show high transition temperatures (82–87 K). The use of a Au buffer layer significantly improves the superconducting properties, particularly the Meissner effect and critical current density (3.3×106 A/cm2 at T=2 K and 3.5×104 A/cm2 at T=77 K). The Au films remain metallic after high-temperature annealing in an oxygen atmosphere. We propose to use Au buffer layers as current shunts to protect superconducting films and devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98979
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Superconducting Au-YBa2Cu3O7 composites (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 927-929 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting Au-YBa2Cu3O7 composites have been fabricated over a Au volume fraction range of 0–100%. Microstructure measurement indicates that Au and YBa2Cu3O7 form well-separated phases. The superconducting transition temperature Tc was found unaffected by the presence of Au. The composites exhibit low normal state resistivity and much improved ductility. The results suggest that Au is an excellent metal host for making ultrafine YBa2Cu3O7 granular solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99276
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  • 5
    Electronic Resource
    Electronic Resource
    Superconductivity and magnetism in transition-element-substituted YBa2Cu3O7 compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4196-4198 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting properties of YBa2Cu3O7 have been investigated by a systematic substitution of 3d transition elements for 10% of the Cu ions. Early transition elements Ti, V, and Cr affect the superconducting temperature of YBa2Cu3O7 only slightly. Local magnetic moment formation is observed in Mn, Fe, Co, and Ni substituted compounds. Tc strongly correlates with the size of the paramagnetic moments, possibly due to scattering from the magnetic sites. Zn displays a phenomenal ability to suppress Tc because of the elimination of the 3d holes. The Zn compositional dependence of Tc indicates that the superconductivity completely disappears at 13–14 at. % of Zn. It is suggested that Zn preferentially substitutes the Cu(2) sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340222
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  • 6
    Electronic Resource
    Electronic Resource
    Particle size dependence of the magnetic properties of ultrafine granular films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4240-4242 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic granular solids consist of ultrafine metal granules of nanometer sizes embedded in an insulating medium. The magnetic properties are dictated by the microstructure such as particle size, metal volume fraction, which are process controlled. We report the results of a series of granular Fe60(SiO2)40 films in which the particle size has been systematically varied. The magnetic coercivity, ranging from 500 to 2200 Oe, increases with particle size. The ferromagnetic-superparamagnetic transition had been studied by SQUID magnetometry and Mössbauer spectroscopy. The value of the magnetic anisotropy energy is found to be much larger than that due to magnetocrystalline anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341126
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetism and the observation of NMR lines in hexagonal Al4Mn and icosahedral Al-Mn alloys (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4364-4365 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previous measurements of the magnetic susceptibility and the intensity of the 55Mn NMR line in a number of periodic and quasiperiodic (i.e., icosahedral) Al-Mn and Al-Mn-Si alloys suggested some correlation, in that the 55Mn line intensity decreases as the magnetic susceptibility increases. This correlation had led to the tentative conclusion that the reduction of the 55Mn line intensity is due to the magnetism, and that the "magnetic'' Mn atoms are not seen in the NMR. We have found that the above correlation breaks down in a very substantial way for hexagonal Al4Mn which (i) shows a small magnetic susceptibility, and (ii) no observable 55Mn line. Thus the reduction in intensity in the 55Mn NMR line in the icosahedral phase is not necessarily due to its magnetism but may have its origin in another line broadening mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338422
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of the spinel phase for FexCu1−xRh2Se4 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5886-5888 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: FexCu1−xRh2Se4 is found to crystallize with a pure spinel structure in the composition range 0≤x≤0.3. Mössbauer spectra of FexCu1−xRh2Se4 have been taken at various temperatures ranging from 4.2 K to room temperature. Analysis of Mössbauer spectra at 4.2 K indicate that the effective hyperfine field increases with increasing iron concentration x and that the quadrupole splitting is negligible. The absence of quadrupole splitting above the magnetic ordering temperature TN indicates that iron ions occupy only the tetrahedral sites. The isomer shifts indicate that the charge states of the Fe ions have a ferric character. Magnetic susceptibility measurements by dc SQUID magnetometry show that long-range superexchange interactions on the tetrahedral sites are antiferromagnetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342190
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  • 9
    Electronic Resource
    Electronic Resource
    Ferromagnetism in metastable 304 stainless steel with bcc structure (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6059-6061 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the consequence of structure on the magnetic properties of 304 stainless steel in two distinct crystalline states. Ordinary 304 stainless steel has an fcc structure and is nonmagnetic at room temperature. By using a vapor quenching method, we have fabricated single-phase metastable bcc 304 stainless steel which is strongly ferromagnetic. Films a few μm thick have been made by high-rate sputter deposition onto substrates at room temperature or liquid-nitrogen temperature. Vibrating sample magnetometry and 57Fe Mössbauer spectroscopy reveal that the bcc phase has a magnetization of 130 emu/g, due largely to the Fe moment. The Curie temperature is found to be excess of 550 °C. Upon subsequent annealing above 550 °C, the metastable bcc state transforms back into the usual nonmagnetic fcc phase. The changes in the magnetic properties and the structure of these films during the transformation are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342154
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic rare-earth superlattices (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3447-3452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic structures of several single-crystal, magnetic rare-earth superlattice systems grown by molecular-beam epitaxy are reviewed. In particular, the results of recent neutron diffraction investigations of long-range magnetic order in Gd-Y, Dy-Y, Gd-Dy, and Ho-Y periodic superlattices are presented. In the Gd-Y system, an antiphase domain structure develops for certain Y layer spacings, whereas modified helical moment configurations are found to occur in the other systems, some of which are commensurate with the chemical superlattice wavelength. References are made to theoretical interaction mechanisms recently proposed to account for the magnetic states of these novel materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340763
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