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  • 1
    Electronic Resource
    Electronic Resource
    Frequency characteristics of the complex permeability and its application to the FEM solutions of hysteretic fields : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4838-4840 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A complex permeability is derived from a Chua-type magnetization model. The frequency characteristic of the complex permeability is calculated and compared with those of experiments. This complex permeability is applied to obtain the finite-element solutions of hysteretic fields. Examination of the field distributions suggests that the frequency characteristic of the magnetic materials is mainly dominated by the essential feature of complex permeability not the field distribution effects such as a skin effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348248
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  • 2
    Electronic Resource
    Electronic Resource
    A representation of magnetization characteristics and its application to the ferroresonance circuits (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4738-4740 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previously, a Chua-type model representing the magnetization characteristics of ferromagnetic materials was presented for computational analysis and design of magnetic devices. Typical magnetization characteristics, such as saturation, hysteresis, and aftereffect, have been reproduced by the model. In this paper, our Chua-type model is derived by means of the barlike domain walls model. As a concrete example, this model is applied to the computations of ferroresonance circuits and is compared with those of the experimental results. Agreement to a considerable extent confirms the validity of this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344819
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  • 3
    Electronic Resource
    Electronic Resource
    A magnetization model for computational magnetodynamics : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4614-4616 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to calculate the magnetodynamic fields exactly, it is essential to work out a magnetization model. We have previously proposed a Chua-type magnetization model based on magnetic domain theory. This Chua-type model is now applied to typical ferromagnetic materials, such as iron, ferrite, and amorphous magnetic material. As a result, it is revealed that the typical magnetization characteristics of representative ferromagnetic materials can be satisfactory reproduced by our Chua-type model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348327
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  • 4
    Electronic Resource
    Electronic Resource
    Double tunnel junctions for magnetic random access memory devices (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6064-6066 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optimum junction resistance and minimum tunnel magnetoresistance (TMR) ratio required for high density and high performance magnetoresistive random access memory (MRAM) devices with a TMR cell plus field effect transistor (FET) switch architecture are discussed by taking into account the variation of FET resistance causing noise. This implies that a TMR ratio over 25% at a 400 mV bias voltage and junction resistance of several tens of kilo-ohms for TMR cells are required with a signal voltage of 30 mV and a sense current of 10 μA, which leads to about 10 ns read time. This large magnetoresistance ratio at the elevated bias voltage requires low bias voltage dependence of TMR for the MRAM devices. In order to try to meet this requirement, double tunnel junctions were fabricated which possess the central ferromagnetic layer consisting of a thin discontinuous layer of hard ferromagnetic Co80Pt20 nanoparticles and insulating Al2O3 prepared by alternate sputtering of Co80Pt20 and Al2O3 targets. The maximum TMR obtained was 20.5% at room temperature for FeCo top and bottom electrodes without annealing. Bias voltage dependence of the (NiFe/CoFe)/1.5 nm Al2O3/discontinuous CoPt/2.6 nm Al2O3/(CoFe/NiFe) double tunnel junctions were revealed to be small compared to that of single junctions, the barrier of which was also fabricated by sputtering of an Al2O3 target. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372613
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  • 5
    Electronic Resource
    Electronic Resource
    Absorption in the visible region of LiNbO3 sequentially implanted with Ag and Cu ions (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1276-1279 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ag and Cu ions were implanted sequentially into LiNbO3 at different ratios of Cu and Ag ions, and in two different energy regimes: kiloelectron volt and megaelectron volt. Optical absorption spectra were measured in the visible region at each stage in the process of annealing the sample. For the samples implanted sequentially with Ag and Cu ions at the low energy of 20 keV, only one peak appeared between 430 and 630 nm, the position of which depended on the ratios of Ag and Cu ions. For the samples implanted at high energies of 3 or 4.2 MeV, two large and distinct absorption peaks were observed at 480 and 590 nm. When the samples were heated to high temperatures, the peak at 480 nm ascribed to colloids of Ag shifted gradually to longer wavelengths and reached 530 nm, whereas the red shift of the peak ascribed to colloids of Cu was approximately 15 nm. Cu atoms diffuse out of the doubly implanted layer faster and at lower temperatures compared with Ag, even when Cu ions were implanted deeper than the Ag. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372008
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  • 6
    Electronic Resource
    Electronic Resource
    A new type of rocket-borne neutral atom analyzer (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3024-3030 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new-type analyzer for measurement of energetic neutral atoms (ENAs) in an energy range of 4–40 keV is described. Incoming ENAs are ionized by electron stripping at passage of an ultrathin carbon foil. After post-acceleration (by 3 kV), the particles are guided to a time-of-flight (TOF) section over a wide energy-per-charge bandwidth by means of electrostatic deflection without any potential sweeping for electrodes. Then, their velocity is measured by the TOF technique, with which species can also be identified, because the particle energies are limited to a certain range by the electrostatic deflector and acceleration upon entering the TOF section. A unique feature in the present analyzer is in the rejection method of extreme ultraviolet (EUV) contamination. In contrast to conventional usage of serrated electrodes for EUV attenuation, one of the electrostatic deflection plates is machined to be so flat that EUV photons are guided to a photon trap regardless of wavelength. The TOF device can also be used in a coincidence mode for noise suppression. The present instrument was flown on a sounding rocket, and has successfully measured ENAs precipitating into the low-latitude upper atmosphere from the magnetosphere. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1304874
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  • 7
    Electronic Resource
    Electronic Resource
    Defect recognition in conductive materials by local magnetic-field measurement : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5907-5909 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Among the various nondestructive testing methods, the electric potential method requires relatively simple device and measurement. However, because of the high electrical contact resistance, sometimes it is difficult to measure the correct local electric potentials by direct contact. In order to overcome this difficulty, method is proposed which involves substituting the local magnetic field for electric potential measurements. The comparison with the conventional electric potential method demonstrates the usefulness this method, especially for materials with low resistivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355558
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  • 8
    Electronic Resource
    Electronic Resource
    New complex permeability measurement device for thin magnetic films : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6887-6889 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previously, we have proposed a strategic dual image (SDI) method to obtain the finite element solution of open boundary magnetic field problems. Also, we have derived a complex permeability from a Chua-type magnetization model. Combination of this complex permeability with the SDI method is now applied to exploit a new high frequency characteristic measurement device for thin magnetic films. Numerical simulation suggests that our new measurement method yields far superior results compared with those of the conventional one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356821
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  • 9
    Electronic Resource
    Electronic Resource
    Polyphase eddy current testing : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5904-5906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polyphase eddy current testing is proposed. The operating principle of this system is as follows. The polyphase eddy current testing system may be regarded as one of the polyphase transformers. Primary balanced polyphase coils are star connected and secondary polyphase circuits are composed of the target. When balanced polyphase currents are fed into the primary coils, zero phase voltage is detected if the target has defects. No zero phase voltage is detected if the target has no defects. It is found that this method has a higher sensitivity compared with that of conventional eddy current testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355557
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous three primary color laser emissions from dye mixtures (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 811-813 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simultaneous two- and three-band laser emissions were obtained in a process of mixing two and three kinds of dyes excited by a nitrogen laser. They were blue, green, and yellow in a coumarin 460 (C460)/disodium fluorescein (DF)/rhodamine 610 (R610) dye mixture, and blue, green, and red in a C460/DF/rhodamin 640 (R640) dye mixture. Strong energy transfers from DF to R610 and to R640 were shown. R610 and R640 laser emissions on mixing with DF were obtained at very low concentrations. They were 4×10−6 mol/l for R610 and 1×10−5 mol/l for R640, compared to the lasing threshold concentration of 1×10−4 and 2×10−4 mol/l of each dye alone. Also, the R610 radiation moved about 35 nm to a shorter wavelength at the reduced concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103319
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