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  • 1985-1989  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic state of Mn in Fe40−xNi40MnxB12Si8 before and after crystallization (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2992-2994 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared amorphous Fe40−xNi40Mnx B12Si8 ribbons by melt spinning and investigated them using magnetometry and spin echo spectrometry. The magnetization increases with the addition of Mn, by 17% for x=0.5. Such an increase is not observed for Ni concentration in less than 40. The NMR frequency of 55Mn at 4 K for x=0.5 is 380 MHz (μMn=3.3μB) and it decreases to 340 MHz for x=5.5. The Mn moments are found to be aligned ferromagnetically to that of the alloy. The presence of Mn also leads to an increase in the magnetic moment of Fe+Ni. After crystallization, one observes in the alloy with x=5.5, two 55Mn impurities in two different compounds. The former should be a canted antiferromagnet and the latter a normal ferromagnet. The temperature-dependence results are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340925
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study of induced uniaxial anisotropy in magnetic thin films by transverse susceptibility (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3328-3330 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transverse susceptibility was measured in Co86Ti14 ferromagnetic thin films which possess an induced in-plane uniaxial anisotropy, as a function of a dc magnetic field H applied parallel to the hard axis. The susceptibility reaches a sharp maximum when H is close to the value of the anisotropy field HK previously determined. A theoretical model based upon a small deviation of H from the hard axis is developed to evaluate the angular dispersion of HK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339318
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetization and nuclear magnetic resonance (spin-echo) studies on an amorphous Co-Fe-Mn-B-Si alloy (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1394-1396 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization and nuclear magnetic resonance spin-echo studies were carried out on an amorphous Co-Fe-Mn-B-Si alloy ribbon. The high-field susceptibility is negligible and saturation is attained at H ∼1.6 MA/m. This would indicate that the alloy is a strong ferromagnet. At 4.2 K, the magnetic moment of the alloy corresponds to 1.13 μB per atom. From the usual values of Co and Fe moments, and based on the charge transfer model, the Mn moment is estimated to be 3.7 μB. Nuclear magnetic resonance studies also give a hyperfine field for Mn corresponding to a moment of about 3.5μB, in agreement with the magnetization values. Such a moment for Mn is indeed high and is reported for the first time in amorphous alloys. The effects of annealing and crystallization on the nuclear magnetic resonance spectra are also reported. For instance, the crystalline phase Co3B contains Mn as an impurity, a fact which is indicated by the still high value of the Mn moment. Finally, the Co-Mn coupling is shown to be ferromagnetic in both the amorphous and crystalline states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334494
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    NMR spin-echo studies in sputtered Heusler alloy films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4119-4120 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have carried out at 4-K spin-echo studies (of 55Mn, 63Cu) on sputtered Heusler alloy (Cu2MnAl) films with substrate temperature Ts in the range of 50–300 °C in order to obtain microscopic information on the magnetic structure. For Ts =60 °C a very broad spectrum is obtained, revealing incomplete (disordered) formation of Cu2MnAl. For Ts =158, 167, 170, and 210 °C, well-defined spectra are observed with Mn at 227 MHz and Cu at 241 and 259 MHz, respectively. Signal intensity studies reveal a maximum for Ts =167 °C in general agreement with the magnetization results of Morisako, Matsumoto, and Naoe. The signal frequencies are also in agreement with those obtained for the bulk alloy. For Ts =300 °C, the spectrum is broadened but the signal frequencies of Mn and Cu remain practically the same. This spectrum is also quantitatively different from that observed for the film with Ts=60 °C, where a low-frequency tail is observed. The effect of post-annealing the films is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340514
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    Paper (German National Licenses)
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