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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and microstructures of CoAg granular films with giant magnetoresistance (1996)
    Springer
    Applied physics 63 (1996), S. 167-170 
    Details
    ISSN: 1432-0630
    Keywords: 75.60.Jp ; 81.35.+k ; 68.55.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567645
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360623
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369387
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of transition from a crystalline to amorphous structure on the magneto-optical Kerr rotation in Fe0.1Co0.9−xSix films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6797-6802 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Films of Fe0.1Co0.9−xSix (x=0.13, 0.28, 0.34) alloy were fabricated on a glass substrate by direct current magnetron sputtering at a substrate temperature of 400 °C and at room temperature (RT). The samples grown at 400 °C are mainly composed of crystalline Co2Si and amorphous Co(Fe) or Si, while the samples grown at RT are mainly amorphous. The polar Kerr spectra were measured in the spectral range 1.6–3.5 eV at room temperature with an applied magnetic field 10 kOe. A 0.01°–0.10° enhancement of the Kerr rotation was found at the transition from the crystalline to amorphous structure, and can be well explained by the changes of microscopic parameters, such as the change of transition energy center, the increase of magnitude of the transition matrix elements, which were obtained from fitting to experimental results. By analyzing the microscopic parameters, we concluded that the enhancement of spin-orbit coupling strength should mainly be responsible for the enhancement of the Kerr rotation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370196
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure investigation of Fe/Al2O3/Fe tunneling junction (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5798-5800 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of Fe/Al2O3/Fe tunneling junction samples were prepared by ion beam sputtering technique. After deposited, the Al layers in a series of samples were exposed to the air for 24–100 h to obtain Al2O3 layers (100 Å) with different oxidation quality. A tunneling magnetoresistance (TMR) value of 5.89% was observed in the sample with the Al layer oxidized for 72 h. The I–V curve of this sample shows a nonlinear relationship, indicating the existence of well metal–insulator contact in the sample. The microstructures of these samples were analyzed by using x-ray photoelectron spectroscopy. The results show that good Al2O3 layers are formed in all samples, but there exists an interdiffusion interface between the Fe and Al2O3 (with Al metal inclusions) layer which greatly influences the TMR effect. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369923
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  • 6
    Electronic Resource
    Electronic Resource
    Large magnetostriction effect in bulk (La1−xSmx)2/3Sr1/3MnO3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4494-4496 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of polycrystalline bulk (La1−xSmx)2/3Sr1/3MnO3 samples over a wide composition range (x=0,0.1,0.33,...,1) was prepared by solid-phase reaction sintering technique. The x-ray diffraction pattern indicates that all the samples have an orthorhombically distorted perovskite structure. A large linear magnetostriction with a value up to −180×10−6 was observed at the temperature of 77 K under the maximum magnetic field of 1.5 T. The linear magnetostriction and magnetoresistance effect of our samples has similar dependence on the Sm content x. At room temperature, the sample with a Curie temperature of 320 K, and a Sm content of x=0.33, shows both maximum linear magnetostriction value of −40×10−6 and a maximum magnetoresistance value of −12%. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370386
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  • 7
    Electronic Resource
    Electronic Resource
    Exchange coupling in Fe50Mn50/Ni81Fe19 bilayer: Dependence on antiferromagnetic layer thickness (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4931-4933 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have determined the dependence of exchange coupling on the antiferromagnetic layer thickness (tAF) in FeMn/NiFe bilayers, where the FeMn layer varies from 0.5 to 32 nm, and the NiFe is constant at 30 nm. For tAF〉3 nm, the exchange field Hex varies as (1/tAF)0.3 at both 80 and 300 K, whereas the coercivity is insensitive to tAF. The value of Hex displays a simple angular dependence of cos θ. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369146
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Mo concentration on the phase composition and magnetic properties of Nd8(Fe,Mo)86B6 nanocomposite magnets (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7336-7339 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The phase composition and magnetic properties of Nd8Fe86−xMoxB6 (x=0, 1, 2, and 3) nanocomposite magnets prepared by melt spinning have been investigated by x-ray powder diffraction, transmission electron microscopy, thermomagnetic analysis, and vibrating sample magnetometer measurements. The optimal ribbons were found to be mainly composed of the α-Fe phase and the Nd2Fe14B phase. The average crystalline size of α-Fe is 14–18 nm. In the optimally quenched samples, the α-Fe phase content decreases with increasing Mo content; at the same time, an increase of coercivity and a decrease of energy products are observed. The hysteresis loops of the optimal ribbons show a single-phase hard magnetic behavior. The reduced remanence ratio is always above 0.66. The remanence enhancement is due to the exchange coupling between the soft and hard magnetic phases in these ribbons. The Curie temperature of the Nd2Fe14B phase in the samples decreases with increasing Mo content. The optimal hard magnetic properties of remanence, coercivity, reduced remanence, and maximum energy product are 120 emu/g, 4.5 kOe, and 0.75 and 135 kJ/m3, respectively, for Nd8Fe86B6. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369358
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  • 9
    Electronic Resource
    Electronic Resource
    Magneto-optical Kerr effect and optical properties of amorphous Co1−xSix (0.59≤×≤0.77) alloy films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 85-87 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Kerr spectra and optical constants of amorphous Co1−xSix (0.59≤×≤0.77) alloy films were measured in the spectral range 1.6–3.5 eV. It was found that there is rather considerable Kerr rotation near the high-energy side of 3.5 eV for the films (0.67≤×≤0.75), and there is a maximum value of −0.35°, which is comparable with that of pure Co, at x=0.75. The considerable Kerr rotation was ascribed to the following two causes: (i) the finite, but nonzero, nondiagonal element of dielectric function; (ii) the large optical constant effect due to the appropriate diagonal element of dielectric function. These changes of dielectric function originated from the metal-to-semiconductor transition controlled by Si concentration. There may be potential magneto-optical application in blue light range for such kinds of material. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122959
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  • 10
    Electronic Resource
    Electronic Resource
    High-coercivity Sm2(Fe,Al,Mo)17C1.5 ribbons with addition of Mo (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5585-5587 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Mo additions on the structure and magnetic properties of Sm2Fe(15.5−x)MoxAl1.5C1.5 alloys have been investigated by means of x-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, and magnetic measurements. The XRD analyses show that as-cast alloys consist mainly of a 2/17-type carbide and a considerable amount of α-Fe. Rapidly quenched, the Mo-containing alloys form a nanocrystalline structure with an average grain size of 35–50 nm, while the amount of the α-Fe phase is greatly decreased. The magnetic hardening of the Mo-containing alloys can be achieved by direct quenching. A coercivity exceeding 1.35 T is obtained for the Sm2Fe14.9Mo0.6Al1.5C1.5 ribbon spun at 40 m/s. These results reveal that the addition of Mo is effective in improving the coercivity. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367398
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