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Magnetics, IEEE Transactions on

Issue 6 • Date November 1987

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Publication Year: 1987 , Page(s): 0
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    Freely Available from IEEE
  • Magnetic properties of new manganese ferrites submicron particles

    Publication Year: 1987 , Page(s): 3869 - 3873
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    New manganese defect metastable ferrites with spinal structure were prepared by oxidation at a temperature lower than 500°C of submicron manganese substituted magnetites, Fe3-xMNxO4( 0 \leq x < 1 ). X-ray diffraction measurements and thermal analysis studies have been carried out on these systems. Low-temperature magnetic measurements have also been carried out. With these studies, it has been possible to depict the cation distribution in substituted magnetites and oxidized compounds, and to understand the complex process of oxidation. In defect spinels, vacancies are formed not only from oxidation of Fe2+ions, but also of Mn2+and Mn3+ions. Manganese-rich compound with x = 0.97 having high content of Mn3+and Mn4+ions show an important increase in coercive force, which exceeds 700 Oe at 4.2 K. View full abstract»

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  • Curie temperature of METGLAS magnetic alloys measured by different techniques

    Publication Year: 1987 , Page(s): 3874 - 3877
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A series of experiments was performed to determine the Curie temperature Tcof six METGLAS® magnetic alloys using three different techniques: thermogravimetry with magnetic field, differential scanning calorimetry (DSC), and magnetic susceptibility. The purpose of the work was to assess the sensitivity of the three methods, to establish the relationships between magnetic properties and enthalpy in the vicinity of Tc, and finally, to determine physically valid criteria for Tcwhen using the susceptibility method. The full matrix of data is given for the following METGLAS alloys: 2605S-2, 2605SC, 2605S-3A, 2705M, 2826MB, and 2605CO. Good accord between the temperature-dependence of magnetic moment, susceptibility, and enthalpy of the first five alloys is shown. A feature which can be identified with Tcis defined for each of the measurement methods. Interesting behavior was observed in the case of the METGLAS alloy 2605CO which has so small an enthalpy of the magnetic transition that DSC cannot be used. Both magnetic methods used, thermogravimetry with magnetic field and susceptibility, reveal a steplike temperature-dependence of magnetic moment and susceptibility. A strong dependence of Tcon the heating rate during measurement was observed, indicating superposition of the magnetic disordering and relaxation processes in the amorphous state. Extrapolation of the data shows that the virtual Tcfor METGLAS 2605CO in the completely amorphous state should be as high as 547°C (820 K). View full abstract»

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  • The anisotrophy of coercive force in cold-rolled goss-texture electrical sheets

    Publication Year: 1987 , Page(s): 3878 - 3881
    Cited by:  Papers (2)
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    The value of coercive force constitutes an important materals constant, and an unfavorable effect of Hcchanges should be taken into consideration in the course of exploitation of electrical machines and equipment. The values of coercive force of anisotropic and isotropic electrical sheets have been presented. It has been found that the crystalline structure and the degree of texture bring forth the anisotropy of coercive force, i.e., the changes of Hcvalue depending on the magnetization directions. The applied measuring method gives results which are exact enough (error δmax< 3 percent) and reproducible. The minimal value of coercive force has been found to be in direction [001] and the maximal value in direction [110], and not in direction [111]. The anisotropy for the directions is correlated with the anisotropy of mechanical properties (the number of bends) and the magnetostriction. View full abstract»

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  • Magnetostatic interaction fields for a three-dimensional array of ferromagnetic cubes

    Publication Year: 1987 , Page(s): 3882 - 3888
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    An exact analytic formula for the magnetostatic interaction energy of a three-dimensional array of ferromagnetic cubes is presented. The magnetization within each cube is assumed constant but varies in direction from cube to cube. From the expressions for the interaction energy, exact formulas for the effective magnetostatic interaction field are derived. This provides a useful tool for three-dimensional micromagnetic calculations. View full abstract»

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  • A new scalar potential formulation for three-dimensional magnetostatic problems

    Publication Year: 1987 , Page(s): 3889 - 3894
    Cited by:  Papers (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    A new scalar potential formulation for three-dimensional problems is described. This formulation avoids cancellation errors within ferromagnetic objects and discontinuities and nonuniqueness of a scalar potential outside these objects. These deficiencies are peculiar to reduced and total scalar potential formulations, respectively. The finite-element discretization is applied to the new scalar potential formulation, and a novel approach to smoothing and extension of finite-element solutions is presented. Some numerical results obtained using the new scalar potential formulation are reported. View full abstract»

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  • Analytic solutions for axisymmetric magnetostatic systems involving iron

    Publication Year: 1987 , Page(s): 3895 - 3902
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB)  

    The analytic solutions are given for three simple axisymmetric systems involving toroidal conductors and iron. The solutions can be used for testing and gauging the accuracy of three-dimensional numerical schemes. In each case it is demonstrated how the fields can be calculated from a spherical harmonic expansion. This provides a unified and efficient method for calculating the fields. View full abstract»

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  • Prototype "Supersat 001"--Probative results

    Publication Year: 1987 , Page(s): 3903 - 3907
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    A new type of large torque air-cored cryogenic ac machine has been presented earlier. The experimental results obtained with the first prototype Supersat 001 are discussed. The experimental results are compared with the theorical ones deduced from a three-dimensional analytical model. The main results concern the static and dynamic behavior and the analysis of the losses which have led to the consideration of a new design of the first prototype. View full abstract»

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  • A hybrid method of analysis of low-speed linear induction motors

    Publication Year: 1987 , Page(s): 3908 - 3915
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    A current-excited low-speed solid-iron secondary single-sided linear induction motor (SLIM) with aluminum reaction rail is considered, A hybrid method of analysis consisting of field analysis in conjunction with the multilayer transfer-matrix concept with adjustment of secondary iron permeability to match the tangential magnetizing field in each layer is developed. It is shown that this method gives valuable information on permeability and flux penetration in secondary iron. Computed thrusts are in good agreement with test results. View full abstract»

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  • Self-inductance of air-core circular coils with rectangular cross section

    Publication Year: 1987 , Page(s): 3916 - 3921
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    Using analytic integration, accurate self-inductance expressions (requiring only single numerical integration) for air-core circular coils with rectangular cross sections (and two special cases, namely thin-wall solenoids and disk (pancake) coils) are derived from the basic mutual-energy formula of two coaxial circular current loops. Based upon these expressions, with integration singularities analytically treated, the self-inductance of any air-core coil can be precisely calculated by use of a microcomputer. Values so computed agreed, to one part in 104, with those reported in the literature. View full abstract»

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  • Imaging effects in contact recording on particulate media

    Publication Year: 1987 , Page(s): 3922 - 3926
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    Contact recording on longitudinal particulate media is modeled self-consistently, including the proper image for the finite gapped head. For moderate ratios of deep gap field to remanent coercivity, the major effect of the proper image occurs in readback, where the reciprocity integral must be performed self-consistently, convolving the head field with the magnetization at each head position. In contact recording the use of proper imaging has a significant effect which predominates in readback and is due to the reversible permeability of the medium. Utilization of proper imaging largely removes the vertical contribution from the readback pulse. However, for higher deep gap fields, the first readback causes irreversible erasure of the high-frequency components of the transition. View full abstract»

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  • [Back cover]

    Publication Year: 1987 , Page(s): 0
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    Freely Available from IEEE
  • Implementation of MB algorithm for nonlinear magnetostatics

    Publication Year: 1987 , Page(s): 3927 - 3928
    Cited by:  Papers (2)
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    The iteration strategy in the MB formulation for nonlinear magnetostatic problems is discussed. The difference between MH and MB iteration is examined, and two methods for implementating the constitutive M(B) relation are presented. View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology