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Magnetics, IEEE Transactions on

Issue 3 • Date May 1993

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Displaying Results 1 - 5 of 5
  • Direction of change of magnetization of a ferromagnet subjected to stress

    Publication Year: 1993 , Page(s): 2077 - 2080
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB)  

    The magnetomechanical effect for a quenched and tempered alloy steel has been studied. In most published work it has been found that stress causes the magnetization to move toward the anhysteretic magnetization. However, in the present work it was found that under special conditions the magnetization moves away from the anhysteretic when a cyclic stress is applied. This behavior is tentatively explained by applying the Preisach model of ferromagnetic hysteresis View full abstract»

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  • Numerical simulations of an electromagnetic acoustic transducer-receiver system for NDT applications

    Publication Year: 1993 , Page(s): 2081 - 2089
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    The development of a multistage numerical model of an electromagnetic acoustic transducer (EMAT), with particular emphasis on an EMAT receiver, is presented. The model includes five separate modeling states: static magnetic field simulation of an electromagnet; pulsed eddy current distribution of a generic meander-line coil suspended over a conducting specimen; Lorentz force distribution due to the interaction of the static magnetic field with the eddy current distributions; acoustic wave generation and propagation based on the dynamic Lorentz forces; and acoustic wave detection by an EMAT receiver. In particular, it is shown how the transient particle displacement fields are converted into an induced voltage response as part of the EMAT receiver system. Numerical simulations show that the voltage response is dependent on the wire spacing of the receiver coil View full abstract»

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  • Eddy current losses at cryogenic temperatures

    Publication Year: 1993 , Page(s): 2095 - 2098
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    The effect of thermal processes on eddy-current losses in the structural elements of cryogenic and superconducting devices are analyzed. Maxwell's equations coupled with the heat-conduction equation are solved, taking into account the dependence of resistivity, heat capacity, and heat-transfer coefficient on temperature. Losses are analyzed as a function of magnetic field, frequency, and geometry for a thin strip in a uniform magnetic field. It is shown that losses calculated taking the thermal processes into account may differ from those obtained at constant temperature View full abstract»

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  • Magnetic field evaluation for thick annular conductors

    Publication Year: 1993 , Page(s): 2090 - 2094
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB)  

    The three-dimensional integration of the Biot-Savart law for conductors in annular sector shape, in which only a constant-density θ-directed current flows, is reported. The expressions obtained allow a quick and accurate evaluation of the components of the vector potential of the stationary magnetic field and of the magnetic induction due to this type of conductor, in iron-free media. The relations presented, together with similar expressions that are valid for other shapes of conductor and current distributions, can be useful for evaluating the magnetic fields in complex, linear, iron-free structures when the geometry can be well approximated with a series of current elements of elementary shape, for which the solution of Laplace's equation is known in closed form View full abstract»

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  • Two-dimensional magnons and domain wall dynamics in yttrium iron garnet

    Publication Year: 1993 , Page(s): 2073 - 2076
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    Interactions between different types of excitations in magnetic domain walls in YIG single crystal plates are investigated by induction and magnetooptic techniques. The behavior of translational and flexural modes of the wall vibrations as a function of wall velocity was found to be asymmetric. The flexural mode amplitudes and eigenfrequencies for positive and negative wall velocities are not equal, and the dynamic structures of the wall moving at positive and negative velocities are found to be essentially different. The character of both asymmetries was reversed by changing the wall polarity. Various nonlinearities in highly excited domain walls were studied, including the appearance of multiple discrete harmonics as well as a continuous component of the Fourier spectrum of the wall vibration signal and the corresponding changes of its mobility and dynamic structure 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.

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