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  • 1
    Electronic Resource
    Electronic Resource
    Method based on the saturation approach law for monitoring the quality of texture in 3% Si–Fe : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5202-5204 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic saturation of a polycrystalline material is achieved as a result of rotation of the magnetization vector toward the direction of the applied magnetic field, against the magnetocrystalline energy. The magnetization rotation process in a grain-oriented material depends on the values of anisotropy constants, on the distribution of grain orientations, and on the direction of magnetization. Based on the magnetization rotation process, a simple instrument was devised and tested to monitor the differences of texture strength in grain-oriented 3% Si–Fe laminates. The simplicity and robustness of this instrument are remarkable and it can easily work on line. © 1996 American Institute of Physics. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361340
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation of magnetic Barkhausen noise with core loss in oriented 3% Si–Fe steel laminates (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3156-3167 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The angular dependence of surface magnetic Barkhausen noise (MBN) with flux densities up to 1.7 T on eight different samples of oriented 3% Si–Fe steel laminate was investigated. On two of the samples encircle MBN measurements were performed. MBN energy values were obtained by integrating the square of the MBN voltage signal with respect to time. The angular variation of the MBN energy signal was modeled by considering anisotropic internal fields that moderate 180° domain wall motion and the local eddy current field interactions between spatially correlated Barkhausen events. The eddy current field interactions arising between 180° domain walls that lie along the sample's primary easy axis direction were represented by a parameter, α′. α′ had a cos θ angular dependence where θ is the angle of the applied sweep field with respect to the sample rolling direction. The angular averaged MBN energy signal, 〈Energy〉, was evaluated and compared with core losses measured using the standard Epstein technique at 1.5 T. Surface MBN measurements on samples with higher 〈Energy〉 demonstrated lower core loss. This was associated with a larger proportion of microscopic eddy currents generated parallel to the sample plane which were, therefore, uncoupled from macroscopic eddy currents generated by the bulk magnetization of the sample. Larger surface 〈Energy〉 signals were identified with a finer domain wall structure. For samples with a nonzero α′, the core loss was observed to decrease with increasing α′ magnitude. This was interpreted as a result of a reduction of microscopic eddy currents arising from an increase in interactions between simultaneously moving 180° domain walls. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361258
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropy of permeability at 10 Oe in textured soft magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8588-8592 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article, we propose and deduce analytical formulas which describe the anisotropy of the permeability at 10 Oe in textured soft magnetic materials. The material texture is represented using the orientation distribution function. The property is compared to experimental data obtained from two grain oriented 3% Si–Fe samples of different texture quality. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362454
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  • 4
    Electronic Resource
    Electronic Resource
    Correlation between the Barkhausen noise power and the total power losses in 3% Si–Fe : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6042-6044 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present results on Barkhausen noise power in grain oriented 3% Si–Fe samples of different quality (power losses). Barkhausen noise is measured at constant values of the magnetic field applied in the rolling direction of the sheet. The measurements indicate a strong correlation between the Barkhausen noise power and total power losses. A model is proposed to interpret the results according to which the Barkhausen noise power is related to the density of pinning centers per unit coercive field, an intrinsic parameter of the material. It is shown that this parameter characterizes the ability of the external field to increase the number of moving walls. The model and the experiment demonstrate that the power losses in grain oriented 3% Si–Fe are improved either by dynamic homogenization of magnetization, or by decreasing the domain wall spacing in static conditions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362084
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular-dynamics simulation of mechanical alloying for the Al50Ti50 alloy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 902-904 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural ordering development during mechanical alloying of the Al50Ti50 alloy was investigated by using molecular-dynamics computer simulations. Random external forces with both random orientations and magnitudes were used to simulate the mechanical alloying processes and pseudopotential was used as a model for the interaction between the atoms. The results indicate that the final nonequilibrium phase obtained through simulation of mechanical alloying is an amorphous state which can be formed experimentally in the laboratory. The transformation from crystals to amorphous state may locally be a first-order-like phase transition, but statistically it is a gradual phase transition due to the characteristics of random external forces which help atoms to overcome their energetic barrier during the mechanical alloying. This means that the transformation occurs in random sites and is discontinuous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354885
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropy of power losses in textured soft magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6915-6919 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The purpose of this study is to develop a new method of correlating texture and power losses in soft magnetic materials. During the magnetization process, part of the loss could be attributed to the energy dissipation which takes place at the time of annihilation of domain walls. Domain walls appear and disappear when a ferromagnetic material is magnetized in a direction different from an easy magnetization direction. Starting from this model, we deduce analytical formulas which describe the anisotropy of the power loss in textured soft magnetic materials. The material's texture is represented using the orientation distribution function. The validity of the model is tested by comparing the theoretical results with the experimental data obtained from a grain oriented 3% Si–Fe sample. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363764
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  • 7
    Electronic Resource
    Electronic Resource
    Reversible magnetization rotation in grain-oriented 3% Si–Fe (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3293-3298 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In grain oriented 3% Si–Fe, the magnetization curve from saturation to remanence is mainly determined by the crystallographic texture. The saturation approach law describes the rotation of magnetization vector towards the magnetic field, which increases in strength in this region of the hysteresis curve. The orientation of the magnetization vector with respect to the easy magnetization direction can be experimentally determined measuring the torque produced by the magnetic field in a disk-shaped specimen. This torque is related directly to the spread of grain orientations and its measure allows us to evaluate different texture qualities. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360020
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  • 8
    Electronic Resource
    Electronic Resource
    Glass formation and crystallization of liquid and glass rubidium: A constant-pressure molecular-dynamics study (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1313-1319 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Glass formation and crystallization processes in supercooled metallic liquid and the crystallization processes in glass are investigated for a rubidium system with 500 atoms by means of a constant-pressure molecular-dynamics technique. Calculations of thermodynamic and structural properties associated with the phase transitions are presented. The processes of structure transformation are analyzed by means of the atomic pair concepts, polyhedra, volume, energy, and pair distribution function. The results demonstrate a feature of structure transformation and show a clear picture of structure transitions during the cooling and heating processes. The glass formation has no sharp variations in the volume, the energy, or the structure, with temperature. However, the crystallization of both the supercooled liquid and the glass do have sharp variations. The results confirm that the transitions associated with these crystallization processes are first-order-like transitions, and that if there is a relaxation of the glass before the crystallization, the heating process which follows makes the glass more stable at low temperature. It is also confirmed that the cooling and heating rates have a strong effect on the transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463258
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  • 9
    Electronic Resource
    Electronic Resource
    Application of the recursion method to calculation of the local moments in Nd2Fe14B (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4130-4132 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recursion method has been used to calculate the local magnetic moment on eight different sites in Nd2Fe14B. The origin of the ferromagnetic arrangement between Nd and Fe moments has been explained. The results are discussed in the light of previous calculations for intermetallic compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334641
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  • 10
    Electronic Resource
    Electronic Resource
    Simple model of the magnetic interaction between grains in construction steel (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4465-4467 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple model is suggested which enables the calculation of the relationship between the domain length and the domain wall spacing in constructional steel. The magnetic interaction between domains in neighboring grains is measured from the observed domain patterns and a coefficient is proposed which makes possible such a calculation for antiparallel domains. The calculated results compare favorably with experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336256
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