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  • 1
    Electronic Resource
    Electronic Resource
    CoPtB(O) alloy films as new perpendicular recording media (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5175-5177 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In search of new hard magnetic materials with high saturation magnetization and large coercivity, a comprehensive study was made on numerous Co- and CoPt-base crystalline alloys by means of sputtering techniques. It revealed that a newly found CoPtB(O) alloy system possessed excellent hard magnetic properties with remarkably large perpendicular coercivity and high saturation magnetization. This new alloy film, deposited onto room temperature substrates, shows the magnetic properties of 4πMs=12 kG, H⊥c=4000 Oe, and perpendicular anisotropy field Hk=22 kOe. These values are superior to those of prevailing materials such as CoCr perpendicular and CoPt or CoNi longitudinal recording media. The typical composition is Co69Pt20B6O5 (at. %), and oxygen plays a momentous role on the coercivity in this alloy film. As a magnetic recording medium, a write/read experiment of this film shows that the readout signal has a +9 dB peak-to-peak amplitude compared with that of metal particle tape at 1 μm wavelength and has +10 dB compared with that of a CoCr perpendicular medium at 0.5 μm wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346052
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetocrystalline anisotropy and magnetostriction of FeRuGaSi single crystals: SOFMAX (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 886-890 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetocrystalline anisotropy constant, K1 and the magnetostriction constants, λ100 and λ111 for recently found soft magnetic FeGaSi and FeRuGaSi alloys were determined in the composition region, 0–8 at. % Ru, 5–15 at. % Ga, 10–22 at. % Si, and bal. Fe. The Ru 4–8 at. %-added FeRuGaSi alloys have the intersectional points, where λ100, λ111, and K1 simultaneously become zero, at the compositions around Fe67Ru4Ga11Si18 and Fe65Ru8Ga8Si19 (at. %), whereas in the FeGaSi alloy the K1=0 line and the two zero magnetostrictive lines are apart from one another.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347328
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  • 3
    Electronic Resource
    Electronic Resource
    The near field of a fully turbulent circular jet (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 3703-3704 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The near-field measurement of fully turbulent jets discharged from a straight circular pipe indicates the presence of quasiperiodic velocity perturbations. The Strouhal number based on the predominant frequency falls in the range of the preferred mode for the jet with a potential core and has an asymptotic value of 0.38 in the high Reynolds number regime. Regular perturbations are not observed in the mixing region immediately downstream from the pipe exit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865103
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  • 4
    Electronic Resource
    Electronic Resource
    Soft magnetic properties of FeRuGaSi alloy films: SOFMAX (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 772-779 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To advance new soft magnetic materials of an FeGaSi alloy into the commercial world, improvements on various properties were designed by introducing additive elements without sacrificing its high saturation magnetic induction. The detailed studies on the diversified properties, such as saturation magnetic induction, film internal stress, wear resistivity, and so on, were performed. High-frequency permeability of the laminated structure film was also investigated. As a result, the Ru-added FeRuGaSi alloy films, whose typical compositions are Fe72Ru4Ga7Si17 and Fe68Ru8Ga7Si17 (at. %), prove to be excellent soft magnetic materials especially appropriate for the magnetic recording/playback head core use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341923
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  • 5
    Electronic Resource
    Electronic Resource
    High-frequency permeability in double-layered structure of amorphous Co-Ta-Zr films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5424-5426 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high-frequency permeability of amorphous Co-Ta-Zr films was studied and the frequency dependence was described in terms of the eddy-current-loss formula. For the double-layered structure intervened with SiO2 film, the degradation of the permeability became apparent with the decrease of SiO2 thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340362
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  • 6
    Electronic Resource
    Electronic Resource
    New crystalline soft magnetic alloy with high saturation magnetization (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3514-3519 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extensive study was made on Fe-base crystalline alloys in search for new soft magnetic materials with high saturation magnetization by means of sputtering technique. It revealed that newly found FeGaSi and FeAlGe alloy systems possessed excellent soft magnetic properties with remarkably higher saturation magnetization. These new alloy films, annealed in vacuum at 500 °C for 1 h, show the magnetic properties of Bs=13 and 15 kG, Hc=0.09 and 0.20 Oe, and μ1 MHz=2000 and 1800 for the FeGaSi and FeAlGe alloy films of 2 μm in thickness, respectively. These values are superior to those of FeAlSi (sendust) alloy which is a typical soft magnetic material with high saturation magnetization. Results of the Co-added systems of FeCoGaSi and FeCoAlGe alloys are also presented. Discussions are given on various systems of Fe base crystalline alloy films studied, which are classified into four types of groups with respect to magnetic softness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338712
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic and other properties and sputtering behavior of Co-base amorphous alloy films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2983-2992 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and other properties of Co-base amorphous alloy films prepared by sputtering are investigated. A detailed magnetic phase diagram with saturation magnetic flux density, crystallization temperature, and zero-magnetostrictive line on Co-Ta-Zr amorphous alloys were obtained, and the technical knowhow to make a film with well-reproducible characteristics by widely changing the sputtering conditions was related with these physical properties. Especially on alloy sputtering, a phenomenological model for elucidating a composition difference between film and target is presented. After these studies, the film characteristics of Bs=12 kG, Tx=450 °C, ||λs||〈10−8, Hc〈10 mOe, and permeabilities of μ(1 MHz)=7000, μ(100 MHz)=2000 for the single film of 2 μm in thickness and of μ(1 MHz)=4000, μ(100 MHz)=800 for the insulator-sandwiched multilayered film of 10 μm are obtained, and these well-balanced values enable us to apply the materials for high-frequency recording head.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337848
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  • 8
    Electronic Resource
    Electronic Resource
    Soft magnetic Fe-Al-N/Si-N multilayered film with high thermal stability (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1181-1182 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt to obtain soft magnetic materials with high saturation magnetic flux density and thermal stability has been carried out with respect to a multilayered type of films containing Fe-N prepared by two-source magnetron rf sputtering. The addition of small amounts of elements such as Al is effective in improving soft magnetic properties of Fe-N films. Multilayered films of Fe-Al-N intervened by thin Si-N layers showed softer magnetic properties than the Fe-Al-N single layer films and also showed high thermal stability. Typically, Fe-Al-N (500 A(ring))/Si-N (12 A(ring)) multilayered films exhibited a saturation magnetic flux density of 20 kG, a coercivity Hc of 0.3 Oe, and a permeability μ of 1900 at 5 MHz after annealing at 550 °C for 1 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101561
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  • 9
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    Meteorological effects in the lower ionosphere as based on VLF/LF signal observations (2014)
    Copernicus
    Details
    Publication Date: 2014-04-24
    Description: Very low and low frequency (VLF/LF) data recorded in the Far Eastern stations Petropavlovsk-Kamchatsky (158.92° E, 53.15° N), Yuzhno-Sakhalinsk (142.75° E, 46.95° N) and Yuzhno-Kurilsk (145.861° E, 44.03° N) are investigated to study the meteorological effects in the lower ionosphere. The results demonstrate the sensitivity of the VLF/LF signals to the variations of atmospheric pressure, humidity, wind velocity and temperature, and the VLF/LF record at the station of Yuzhno-Kurilsk is found to be most sensitive to those variations of atmospheric parameters. The region under consideration is characterized by high winter cyclonic activity in midlatitudes and strong summer and autumn typhoon activity in low latitudes. VLF/LF signal variations during 8 tropical cyclones (TCs) with different intensity are considered. Negative nighttime anomalies in the signal amplitude that are most probably caused by TC activity are found for 6 events. Those anomalies are observed during 1–2 days when TCs move inside the sensitivity zones of the subionospheric paths. Perturbations of the VLF signal observed during 2 TCs can be caused by both the TC influence and seismic activity, but no correlation between TC intensity and magnitude of the signal anomalies is found. Spectral analysis of the typhoon-induced disturbed signals revealed the fluctuations with time periods in the range of 7–16 and 15–55 min that corresponds to the range of internal gravity waves periods.
    Electronic ISSN: 2195-9269
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 10
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    On the fluctuation spectra of seismo-electromagnetic phenomena (2011)
    Copernicus
    Details
    Publication Date: 2011-02-03
    Description: In order to increase the credibility on the presence of electromagnetic phenomena associated with an earthquake, we have suggested the importance of the modulation (or fluctuation) seen in the time-series data of any seismogenic effects. This paper reviews the fluctuation spectra of seismogenic phenomena in order to indicate the modulation mechanisms in the lithosphere, atmosphere and ionosphere/magnetosphere. Especially, the effect of Earth's tides in the lithosphere and the modulation in the atmosphere (acoustic and atmospheric gravity waves) are discussed and this kind of fluctuation spectra would further provide essential information on the generation mechanisms of different seismogenic effects. Furthermore, the important role of the slope of fluctuation spectra is suggested in order to investigate the self-organized criticality before the lithospheric rupture and its associated effects in different regions such as the ionosphere.
    Print ISSN: 1561-8633
    Electronic ISSN: 1684-9981
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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