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  • 1
    Electronic Resource
    Electronic Resource
    The change of magnetic properties in nanocrystalline Fe88Zr7B4Cu1 alloy by cooling rate : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5153-5155 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the effect of cooling rate, followed immediately after the isothermal annealing, on the magnetic properties of melt-spun Fe88Zr7B4Cu1 alloy. As the cooling rate is increased, the effective permeability, 2×104, improved by 50% on annealing at around 650 °C. The remanence ratio is also found to concomitantly decrease with the increasing cooling rate. The increase of permeability and decrease of remanence ratio are consistent with the expected suppression of the induced magnetic anisotropy. From an analysis of the transmission electron microscopy micrographs, and the x-ray diffraction spectral intensities, we find that the volume fraction of the amorphous matrix to that of the nanocrystallized magnetic entities to be about 20%, at which the permeability has the maximum value for this system. Scanning electron microscopy and antiferromagnetic investigations show a much smoother surface morphology with a finer grain distribution in the rapidly quenched sample. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361538
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties and the crystallization of amorphous Fe83B9Nb7Cu1 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5459-5461 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amorphous state of ferromagnetic Fe83B9Nb7Cu1 and its nanocrystallization have been studied by x-ray, Mössbauer spectroscopy, and magnetic moment measurements. In the amorphous state at 13 K, the Mössbauer spectrum exhibits an essentially symmetric hyperfine field distribution with a half-width of 72 kOe. The average hyperfine field Hhf(T) of the amorphous state shows a temperature dependence of [Hhf(T)−Hhf(O)]/Hhf(O)=−0.48(T/TC)3/2 u −0.22(T/TC)5/2 for T/TC〈0.7, indicative of spin-wave excitation. The quadrupole splitting just above the Curie temperature TC is 0.43 mm/s, whereas the average quadrupole shift below TC is zero. The Curie and crystallization temperatures are determined to be TC=393 K and Tx=775 K, respectively, for a heating rate of 5 K/min. The occupied area of the nanocrystalline phase at the optimum annealing temperature is about 33%–71%. It is notable that the magnetization of the amorphous phase decreases more rapidly with reduced temperature than those of nanocrystalline ferromagnets, suggesting the presence of the distribution of exchange interactions in the amorphous phase or high metalloid contents. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362337
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Al on the magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6591-6593 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Al on the soft magnetic properties of nanocrystalline Fe73.5−xAlxCu1Nb3Si13.5B9 alloy ribbons are investigated in the composition range of 0≤x≤1.0. The relative initial permeability at 1 kHz is found to increase by the addition of Al, and reaches the peak value at x=0.1. The coercivity decreases, rather significantly, with the Al content in the whole composition range investigated in the present work, the values of the coercivity being 12.5 mOe at x=0 and 9.3 mOe at x=1.0. The magnetic induction at an applied field of 10 Oe, however, decreases moderately by the introduction of Al, possibly due to the dilution effect. The improvement in the soft magnetic properties is considered to result from the reduction in the grain size of the α Fe-Si solid solution phase of the Al-added alloy ribbons, which has been observed by transmission electron microscopy. Another factor may be due to the decrease in the intrinsic magnetocrystalline anisotropy K1 as Al is added to the alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352574
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic aftereffect in nanocrystalline Fe88Zr7B4Cu1 alloy : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6594-6596 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic relaxation phenomenon was investigated by using the pulse method for an Fe88Zr7B4Cu1 alloy with nanoscale grain structure, which was prepared by melt quenching and a subsequent annealing. In order to know the relationship between the microstructure and the magnitude of magnetic aftereffect in the nanocrystalline state, annealing temperature dependence of volume fractions of crystalline bcc-Fe and residual amorphous phase was also measured. It was found that disaccommodation occurred in this nanocrystalline alloy, and the intensity of disaccommodation decreased as the fraction of the crystalline bcc-Fe phase increased. Moreover, the jumping field, defined by the magnetic field, at which initial magnetization curve rises abruptly decreased as the fraction of residual amorphous phase was reduced. From the observed results, the magnetic aftereffect was considered to result from the residual amorphous phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352575
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetostriction of melt-spun Dy-Fe-B alloys : 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. 7021-7023 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetostriction of melt-spun ribbons of Dyx(Fe1−yBy)1−x (x=0.2, 0.25, 0.3; 0≤y≤0.2) alloys is systematically investigated as a function of the wheel speed during melt quenching. As the wheel speed increases from 10 to 50 m/s, the magnetic softness improves with the wheel speed rather continuously for the alloys with the Dy content x=0.2 and 0.25 but it exhibits a maximum at the wheel speed of 30 or 40 m/s for the alloys with the highest B content (x=0.3). The softness also improves with the B content for a fixed wheel speed. Homogeneous and ultrafine grain structure is observed for the first time even in the as-spun state when the ribbons of the alloy Dy0.3(Fe0.8B0.2)0.7 are fabricated at the wheel speed of 30 m/s. The ribbon having the ultrafine grain structure exhibits good magnetic softness together with a high strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358074
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties behaviors in Fe88Zr7B4Cu1 nanocrystalline alloy prepared by different postanneal cooling rates : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6943-6945 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of cooling rate after annealing on the soft magnetic properties were investigated for an Fe88Zr7B4Cu1 alloy with nanoscale grain structure, which was prepared by melt quenching. As the cooling rate increased, the effective permeability improved and the remanence ratio, which indicates the orientation of magnetic anisotropy (degree of pair ordering), decreased. The increase of permeability and decrease of remanence ratio were considered to result from the suppression of the induced magnetic anisotropy. Furthermore, the variation of disaccommodation behaviors with cooling rate was investigated in the Fe88Zr7B4Cu1 nanocrystalline alloy. It was found that the value of D (intensity of disaccommodation) was a little higher for the samples obtained from the high cooling rate than that for the low cooling rate. This result can be explained by domain structure stabilization due to local induced magnetic anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356789
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of melt temperature on the magnetic properties of FeCuNbSiB alloy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 865-870 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of an Fe73.5Cu1Nb3Si13.5B9 alloy with nanoscale crystalline structure have been investigated as a function of the melt temperature. In the temperature range of 1240 to 1380 °C investigated in the present study, the permeability increases with the melt temperature. This result may be explained in terms of the reduction in the magnetic anisotropy as a function of the melt temperature. This is supported by the results for the remanence ratio, which also increases with melt temperature in a similar manner to the permeability. In the latter part of the work described in this paper, the relationships between the permeability and the coercivity, and the permeability and the remanence ratio have been investigated for the nanocrystalline alloy. It was found that the permeability is correlated more closely to the remanence ratio than the coercivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353298
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between ac and dc magnetic properties of a Co-based amorphous alloy : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6937-6939 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: How the ac effective permeability (μe) correlates with dc magnetic properties over a wide frequency range of 1 to 1000 kHz was studied, in an effort to understand the magnetization behavior of the Co-based amorphous alloy of Metglas 2714A subject to an ac magnetic field. In the low-frequency range up to 50 kHz, the correlations between μe and the dc initial permeability, and between μe and the coercivity are found to be good, the correlation coefficient being positive and negative, respectively. No definite correlation is observed with the dc maximum permeability. At high frequencies ranging from about 200 to 1000 kHz, the correlations between μe and the dc maximum permeability, and between μe and the coercivity are observed to be good, the correlation coefficient being negative and positive, respectively. The correlation of μe with the dc initial permeability is poor in this high-frequency range. The correlation with the remanence ratio is found to be rather different from the other three; the ac permeability exhibits a maximum at the value of remanence ratio of 0.5–0.6 at frequencies up to 200 kHz but, at frequencies higher than 500 kHz, it decreases linearly with the remanence ratio. From the correlation results it is considered that the dominant magnetization mechanism is the domain wall motion at frequencies up to 50 kHz and it is spin rotation at frequencies higher than 500 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356787
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship between crystallization process and magnetic properties of Fe-(Cu-Nb)-Si-B amorphous alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5568-5570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Cu and/or Nb addition on crystallization processes and soft magnetic properties for Fe-Si-B alloys has been investigated. For Fe-Si-B, Fe-Cu-Si-B, and Fe-Nb-Si-B alloys annealed at various temperatures, the effective permeabilities were very low and decreased considerably as they crystallized, while for Fe-Cu-Nb-Si-B alloy annealed at a temperature above Tx , a very good soft magnetic property was obtained. From DTA analysis of Fe-Cu-Nb-Si-B alloys, it became clear that the combined addition of Cu and Nb expanded largely the temperature range over 100 °C where a single phase of α-Fe solid solution can exist. Above 580 °C, the second crystalline phase such as Fe2 B and some unidentified phases other than the α-Fe phase precipitated, and soft magnetic properties deteriorated rapidly. It is concluded that the combined addition of Cu and Nb makes the α-Fe single phase stable in a broad temperature range, which is considered to be the necessary condition for the superior soft magnetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345887
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of Pr-Fe-B alloy powders prepared by mechanical grinding : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6591-6593 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of ball milling on the magnetic properties of the Pr15Fe80B5 alloy, whose as-cast structure was composed of matrix phase Pr2Fe14B and Pr-rich and α-Fe phases, has been investigated by measuring iHc, thermomagnetic curves, and x-ray diffraction (XRD) patterns. By ball milling using a planetary ball mill up to 96 h, iHc decreased with the amorphization of the matrix and Pr-rich phases. However, subsequent heat treatments gave rise to the marked increase of iHc. The alloy, after 48 h of ball milling and subsequent 600 °C annealing possessed iHc of 17.4 kOe, Br of 5.8 kG, and (BH)max of 6.5 MGOe. This alloy showed sharp diffraction peaks of Pr2Fe14B phase, while the α-Fe phase peak, which persisted through the ball milling process, almost disappeared. The high iHc of the Pr-Fe-B alloy, subjected to optimum milling and subsequent annealing, was attributed to a very fine Pr2Fe14B phase precipitation from the amorphous state and to the effective solution of the α-Fe phase into the matrix phase. Also, a small addition of Cu to the Pr15Fe80B5 alloy was found to increase the coercivity. Further, the alloy milled for 12 h and annealed at 600 °C for 1 h showed iHc of 19.7 kOe, Br of 7.0 kG, and (BH)max of 10.2 MGOe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349867
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