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Digitale Medien

Formation of metastable compounds and magnetic properties in rapidly quenched (Fe1−x Cox)5Sm and (Fe1−xCox)7Sm2 alloy systems (1988)

Miyazaki, T. ; Takahashi, Mikio ; Yang, Xingbo ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 5974-5976

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The formation of metastable (TM)5Sm and (TM)7Sm2 (TM=Fe-Co) compounds and their magnetic properties have been investigatyed by the x-ray diffraction method and analysis of thermomagnetization curves for rapidly quenched (Fe1−x Cox)5Sm and (Fe1−x Cox)7Sm2 (0≤x≤1.0) alloys. The (Fe1−x Cox)5Sm compound is formed with a single phase in the range 0.7≤x≤1.0 and a mixture with other stable compounds in other composition range. On the other hand, the metastable (TM)7Sm2 compound exists in the mixed state with a large amount of (TM)3Sm stable compound in the range 0.7≤x≤1.0. The single phase (RM)5Sm compound exhibits a huge coercivity of 5–14 kOe.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.342167

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Digitale Medien

Axisymmetric problem of vortex sound with solid surfaces (1986)

Miyazaki, T. ; Kambe, T.

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 29 (1986), S. 4006-4015

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A general formulation of the axisymmetric vortex sound is given, and three typical problems are considered in detail, in which the acoustic wave is generated by a vortex ring interacting with either a sphere, a circular disk, or a circular aperture of a plane wall in an axisymmetric manner. The velocity potentials induced by the vortex in the presence of the body are determined by the method of dual integral equations or the image vortex. From the vortex trajectories, the acoustic wave fields are determined. The method of matched asymptotic expansions yields the result that the force exerted on the body is related to the profile of the dipole component. It is also found that the wave amplitude is expressed in terms of the value of a streamfunction at the vortex position, which represents a hypothetical potential flow around the body and is defined appropriately in each problem.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.865741

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Digitale Medien

Magnetic relaxation in amorphous (Fe,Co)100−xBx alloys (1985)

Miyazaki, T. ; Takahashi, M. ; Hisatake, K.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 57 (1985), S. 3575-3577

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The disaccommodation and the uniaxial magnetic anisotropy induced by magnetic annealing were studied for rapidly quenched amorphous Fe100−xBx (12≤x≤25) and Co100−xBx (17≤x≤30) alloys. The disaccommodation exhibits a maximum between 150–250 °C for Fe-B and 50–250 °C for Co-B alloys. The compositional dependence of both disaccommodation and induced magnetic anisotropy constant exhibits an anomaly at x=20. The origin of disaccommodation is discussed in connection with the induced magnetic anisotropy. Further, the compositional dependence of induced magnetic anisotropy is discussed based on the compositional short-range ordering.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.335011

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Digitale Medien

Spin glass in Fe-Ni Invar alloys (1985)

Miyazaki, T. ; Ando, Y. ; Takahashi, M.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 57 (1985), S. 3456-3458

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Initial ac susceptibility χ was examined in the temperature range from 4.2 K to Curie temperatures for polycrystalline Fe100−xNix (20≤x≤50) alloys. The reentrant spin glass is found in x=30–45 alloys. The dependence of the freezing temperature Tg on the intensity of driving magnetic field (ac: 0–0.26 Oe; dc: 0–10 Oe) and on the frequency (140–9200 Hz) was studied for the Fe65Ni35 alloy. A strong magnetic relaxation is observed below Tg. These results are discussed based on the cluster model.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.335075

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Digitale Medien

Magnetic properties of Co-R (R=Pr,Nd,Sm,Gd,Dy,Er) amorphous alloys (1988)

Yang, Xingbo ; Miyazaki, T.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 5489-5491

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Magnetization and susceptibility have been measured in the temperature range 4.2–300 K for amorphous Co100−x Rx (R=Pr,Nd,Sm,Gd,Dy,Er; 50≤x≤70) alloys prepared by a liquid-quenching technique. All alloys show a normal ferromagnetic behavior at low temperatures and a Curie–Weiss-type temperature dependence of susceptibility in the paramagnetic regime except for the Co-Sm alloy system. In the case of the Co-Sm alloys, a field-cooling effect at lower temperatures and a temperature dependence of paramagnetic susceptibility similar to that of the Van Vleck ion are observed. From analysis of the average effective moment, it is concluded that the Co no longer sustains a moment above 60 at. % R.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.342335

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