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  • 1
    Digitale Medien
    Digitale Medien
    Preparation and microstructures of CoAg granular films with giant magnetoresistance (1996)
    Springer
    Applied physics 63 (1996), S. 167-170 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 75.60.Jp ; 81.35.+k ; 68.55.Bg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract A series of Co x Ag1−x (0 ≤x 〈 100 at.%) granular films were deposited onto glass substrates with the thickness on the order of 400 nm using the ion-beam cosputtering technique at different substrate temperatures. Systematical investigations were made on the Giant MagnetoResistance (GMR) effect and microstructures in these thin granular films. The magnetoresistance ratio strongly depends on cobalt concentration, substrate temperature, and the optimal value of GMR was observed in Co22Ag78 sample prepared at a temperature of 300 K. Microstructures of these films are closely related to the fabricating process, and thus influence the GMR.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01567645
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetocaloric effect in perovskite manganites La0.7−xNdxCa0.3MnO3 and La0.7Ca0.3MnO3 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5689-5691 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In perovskite manganites La0.7−xNdxCa0.3MnO3 (x=0, 0.05, 0.1, 0.15, and 0.20) prepared by the sol–gel technique, large magnetocaloric effects have been observed. The maximum of the magnetic entropy change peaks at the magnetic ordering temperature. Compared to La0.7Ca0.3MnO3, an enhancement of the magnetocaloric effect has been obtained in the samples with Nd3+ dopant (for La0.5Nd0.2Ca0.3MnO3, the maximum of ΔSM is about −2.31 J/kg K). © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1415055
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetic entropy change in La0.54Ca0.32MnO3−δ (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 524-526 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A La-deficient manganite perovskite sample La0.54Ca0.32MnO3−δ was prepared by conventional solid-state reaction method. The Curie temperature TC is 272 K, about 10 K higher than that of La1−xCaxMnO3. A large magnetic entropy change has been observed and the maximum −ΔSM(approximate)2.9 J/kg K appears at its Curie temperature upon a 0.9 T magnetic field change. The easy fabrication and higher chemical stability make La0.54Ca0.32MnO3−δ a suitable candidate as a working substance in magnetic refrigeration technology. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1379047
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  • 4
    Digitale Medien
    Digitale Medien
    Magnetooptical Kerr effect in Fe-SiO2 granular films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 439-441 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Polar Kerr rotation spectra of Fe-SiO2 granular films were measured at room temperature in the wavelength region between 400 nm and 850 nm. A maximum Kerr rotation angle (θk) of 18 min was obtained when a magnetic field of 10 kOe was applied perpendicular to the film plane. We have measured θk as a function of Fe volume fraction (fv) of the films. It was found that θk increases with increasing fv and peaks at fv≈0.4. We also found that θk decreases as the Fe particle size increases. Our results indicate that the density of Fe particles and the interfaces between Fe particles and SiO2 matrix may play an important role in the Kerr rotation of granular films. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360623
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetic properties of FeSi-SiO2 granular films : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6490-6492 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The ferromagnetic resonance (FMR) spectra and coercivities of FeSi-SiO2 granular films have been measured over a wide range of FeSi volume fractions (fv). The films were prepared using the ion-beam sputtering technique and transmission electron microscopy showed that the FeSi alloy granules are embedded in a matrix of SiO2. An enhanced coercivity (Hc), as high as 329 Oe at room temperature, is observed. For some samples, there are several resonance peaks in the FMR spectra, which include one major peak and several minor peaks. The major and minor peaks correspond to the usual uniform mode and spin-wave respectively. In our experiments, the field separations between the major and the minor peaks show a complex fashion. Our results are discussed in comparison with some theoretical models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.358235
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  • 6
    Digitale Medien
    Digitale Medien
    Structural and superconducting properties of Bi-Sr-Ca-Cu superconductors studied by Fe doping (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4512-4514 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: 1.5% of Fe has been substituted for Cu in several "2212'' and "2223'' Bi-Sr-Ca-Cu superconductors. All of the samples show a reduction of Tc by about 13 K due to the Fe impurities. Mössbauer measurements at room temperature reveal structural characteristics such as stacking faults and intergrowth of different phases in these Bi-based compounds on the microscopic scale. The suppression of Tc due to Fe doping in the Bi "2212'' or " 2223'' system is comparable to that of the "123'' system, but much smaller than that of the "214'' system. The interplanar correlation existing in the "123'' and the Bi "2212'' and "2223''systems seems to play an important role in sustaining the high-temperature superconductivity and weakening the detrimental effect of impurity elements on superconductivity in these two systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344880
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  • 7
    Digitale Medien
    Digitale Medien
    The effect of Fe in Fe-doped YBa2Cu3O7 superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5458-5460 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A series of samples of YBa2(Cu1−xFex)3O7 with x ranging from 0 to 0.13 was made and investigated by x-ray diffraction, dc SQUID magnetometry, and Mössbauer spectroscopy. In the samples made by the ordinary process, Fe mainly occupies Cu(1) sites. The orthorhombic-to-tetragonal structural transition occurs at x(approximately-equal-to)0.03, and the superconducting transition temperature is depressed to zero at x(approximately-equal-to)0.17. By annealing the samples in Ar gas at 750 °C for 24 h and then reloading the lost oxygen in O2 gas at 210 °C for 48 h, we were able to draw about 30% of the Fe from Cu(1) sites into Cu(2) sites. This was verified by the enhancement of the component in the Mössbauer spectrum corresponding to Fe in the Cu(2) sites. The structural and superconducting properties of this new series of samples were also investigated. Comparison with the ordinary Fe-doped samples was also made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345844
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  • 8
    Digitale Medien
    Digitale Medien
    Effects of magnetic surface anisotropy near the (110)Fe/MnF2 and (110)Fe/(111)Ag/MnF2 interfaces (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5684-5684 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Two series of samples, Ag/56Fe/57Fe/56Fex/MnF2 and Ag/56Fe/57Fe/Agx/MnF2 with Ag and Fe in (111) and (110) orientations, respectively, have been grown epitaxially in ultrahigh vacuum (∼1×10−9 τ). Several thicknesses are chosen for the 56Fe and Ag intervening layers separating 57Fe and MnF2. The magnetic hyperfine field for the 57Fe probe layer about 3 monoatomic layers (ML) thick is measured with Mössbauer spectroscopy from room temperature down to 4.2 K. For the first series of samples, a quasi-linear temperature dependence of the hyperfine field is observed for the probe layer up to 10 ML away from the (110)Fe/MnF2 interface. The magnitude of the linear slope is smaller for the 10-ML sample than for the 5-ML sample. An ordinary T3/2 dependence is recovered when the 57Fe probe layer is placed 25 ML away from the interface. This result can be qualitatively understood within the framework of a semiclassical spin-wave calculation involving a large positive surface anisotropy constant Kss by Rado. For the second series of samples, significant amount of FeF2 (about 40% of the 57Fe) is found to be present in the 57Fe probe layer. The temperature dependence of the hyperfine field exhibits an initial weak dependence at low temperatures (〈76 K) changing over to a fast quasi-linear falloff at higher temperatures for both samples with x(Ag)=9 and 19 ML. A possible explanation for this behavior is that below ∼76 K, the Néel temperature for antiferromagnetic FeF2, the 57Fe probe behaves as a three-dimensional antiferromagnet and thus exhibits a T2 dependence, while for temperatures above ∼76 K it exhibits a quasi-linear temperature dependence presumably due to the same mechanism responsible for the quasi-linear temperature dependence in the first series of samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345928
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  • 9
    Digitale Medien
    Digitale Medien
    Larger magnetocaloric effect in two-layered La1.6Ca1.4Mn2O7 polycrystal (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7975-7977 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetocaloric effect in La1.6Ca1.4Mn2O7 polycrystal with the layered Sr3Ti2O7-type perovskite structure has been studied. It is found that the magnetic entropy change of La1.6Ca1.4Mn2O7 is comparable to that of Gd, but smaller and more broadened than that of La0.8Ca0.2MnO3. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369387
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  • 10
    Digitale Medien
    Digitale Medien
    The properties and magnetically softened grain boundaries of Nd10Fe84−xB6Inx (x=0,1,2) exchange coupling magnets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7230-7233 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetic behavior of Nd10Fe84−xB6Inx (x=0,1,2) nanocomposites was investigated. It was found that a certain amount of indium (x=1) added to Nd10Fe84B6 magnets enhances the hard magnetic properties. The optimum coercivity and remanence ratio was increased from 5.0 kOe and 0.71 to 5.8 kOe and 0.83, respectively. The squareness of the hysteresis loop is improved greatly. The maximum magnetic energy product (BH)max increases remarkably from 12 to 18 MGOe. The origin for those enhancements is mainly attributed to the magnetically softened grain boundaries and enhanced crystallographical coherency by indium addition. The magnetic annealing is found to be helpful to enhance the coherency and coupling between hard and soft phases. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1323530
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