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IEEE Transactions on Magnetics

Issue 4 • Date December 1967

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Displaying Results 1 - 25 of 25
  • [Front cover and table of contents]

    Publication Year: 1967, Page(s): 0
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  • Editorial

    Publication Year: 1967, Page(s): 576
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  • New ADCOM members

    Publication Year: 1967, Page(s):577 - 578
    Cited by:  Papers (1)
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  • Hysteretic magnetic dipole interaction model

    Publication Year: 1967, Page(s):579 - 586
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The interacting array of fine magnetic particles has been studied with a hysteretic magnetic dipole model which simulates a dilute well-dispersed array of fine particles. In any state each dipole element is either parallel or antiparallel to the array axis. In the model the elements reverse according to vulnerability. The cubic array of assigned elements is extended in the calculations by adding h... View full abstract»

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  • Empirical expression for the axial field of cylindrical bar magnets

    Publication Year: 1967, Page(s):587 - 589
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (317 KB)

    Theoretical values of the magnetic field intensity outside a permanent magnet usually agree with experiment only at distance greater than the length of the magnet. This theoretical formula is modified to fit experimental results at shorter distances as well so that it can serve as a convenient analytical approximation for practical problems involving cylindrical bar magnets. Measurements are repor... View full abstract»

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  • A simple electromagnetic shock wave analysis using boundaries in a moving frame of reference

    Publication Year: 1967, Page(s):589 - 593
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    The propagation of a planar shock wave in a lossless nonlinear magnetic medium is treated with certain idealizations. Considering a monotonically increasing pulse input, a simple formulation is given for the calculation of shock velocities and shock discontinuities. Field profiles are obtained with procedures very similar to those of linear media with fixed discontinuity surfaces. The implications... View full abstract»

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  • Proposal for a magnetic-film memory accessed by combined photon and electron beams

    Publication Year: 1967, Page(s):593 - 599
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (673 KB)

    A magnetic-film memory accessed by combined photon and electron beams is proposed. The electron beam is used to heat a selected bit, which results in lowering the switching threshold so that information can be written selectively into that bit by means of an external magnetic field. Reading is accomplished by simultaneously illuminating a bit with an electron and a photon beam. Then a thermally mo... View full abstract»

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  • Dynamic magneto-optic detector for analog readout

    Publication Year: 1967, Page(s):599 - 605
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (799 KB)

    The addition of a polarization azimuth vibrator, such as a Faraday cell, to a conventional Kerr apparatus yields a dynamic detector with a high SNR capability. The method described here has been utilized in the past as a null detector to observe Kerr rotation. It can be used equally well for analog readout of the magnetic state of the film element. The improved Kerr apparatus is well-suited to a c... View full abstract»

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  • A high-density magneto-optic memory

    Publication Year: 1967, Page(s):605 - 611
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1068 KB)

    A magneto-optic memory element which was first proposed by Chang et al. has been investigated. The element is based upon the properties of ferrimagnetic materials with a compensation temperature. It is a single crystal wafer of gadolinium iron garnet. The importance of domain walls in limiting the minimum size of a bit was recognized. This limitation was removed by scribing the wafer into square b... View full abstract»

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  • Curvature of domain walls

    Publication Year: 1967, Page(s):611 - 615
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (673 KB)

    An experiment was performed whereby domain walls were forced to bulge under the influence of an applied easy-axis field H . The region where the domain wall is bent appears to be approximately circular. To relate the radius of such a curved domain wall to theory, a model was chosen that takes into account magnetostatic, anisotropy, and exchange energy. The assu... View full abstract»

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  • A novel type of reversal propagating at high speed

    Publication Year: 1967, Page(s):616 - 620
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Switching of a magnetic film can be induced by a homogeneous easy-axis field Hebelow switching threshold and a large, locally applied hard-axis field Hh. If Hhis a step function in time, the magnetization inside the region of the hard-axis field rotates with negligible delay toward the hard axis while the region outside tries to establish a state of curled magnetiz... View full abstract»

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  • Method of determining the magnetic field of a recording head by using tapes of various coating thicknesses

    Publication Year: 1967, Page(s):625 - 627
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    In magnetic recording, the field configuration of the writing head is of major importance, but it is difficult to measure its actual strength. This paper describes a method of determining both the field geometry of a head and the field strength by using tapes of various coating thicknesses. By differentiating the magnetic flux with respect to the thickness, remanence curves are obtained. These cur... View full abstract»

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  • The vibrating head magnetometer--Instrument for the measurement of magnetic transitions in high coercive force films

    Publication Year: 1967, Page(s):621 - 624
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The magnetization pattern recorded in high coercive force media, such as magnetic tapes or discs, is measured with the vibrating head magnetometer (VHM) by vibrating a recording head parallel to the surface of the medium and along the track length. The VHM can be used with small, irregular-shaped samples. It can be used to measure precisely the shape of recorded magnetic transitions. Application o... View full abstract»

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  • Crossed-film cryotron switching speed

    Publication Year: 1967, Page(s):628 - 635
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    To date there have been no direct measurements of the switching speed of an individual crossed-film cryotron (CFC) due to the extremely low gate resistance of the device in its normal state. A method which is, in principle, similar to conventional sampling techniques is used to determine the CFC switching speed with a 2-ns time resolution and a gate resistance sensitivity of 0.1 μΩ. CFC ... View full abstract»

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  • Multilayer processing for magnetic film memory devices

    Publication Year: 1967, Page(s):635 - 640
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (967 KB)

    Planar processing techniques for producing coupled film storage devices are presented. The discussion centers around a process sequence for a coupled easy-axis structure built on a metal substrate, largely by vacuum deposition techniques. The process results in packing density of about 8000 bits/in2. Included is a test of one such element displaying useful memory device characteristics ... View full abstract»

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  • Low-frequency measurement of anisotropy field

    Publication Year: 1967, Page(s):647 - 653
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A number of different methods of measuring the anisotropy field HKof magnetic films were investigated for application to the automation of low-frequency measurements. These methods included torque, the large signal susceptibility method recommended by the IEEE,[5] the small signal susceptibility, and a new method using the second harmonic component of the magnetization signal. The agree... View full abstract»

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  • Very high-speed cross-sectional model for a 147-kbit thin magnetic film memory in the NDRO mode

    Publication Year: 1967, Page(s):640 - 647
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    A cross-sectional model is designed to prove the feasibility of a 147-kbit thin magnetic film memory in the eddy current braked nondestructive readout (NDRO) mode. With the full word, digit, and sense line lengths, the model is operated with drive currents smaller than 400 mA. The write and the nondestructive read word pulses are different in amplitude and duration, but fit the requirements of a h... View full abstract»

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  • Bibliograpgy of thin magnetic films (1963--1967)

    Publication Year: 1967, Page(s):653 - 700
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5729 KB)

    This bibliography (1963-1967) lists 1300 articles and 170 patents, supplementing an earlier one (-1963) which contains 735 articles and 60 patents. View full abstract»

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  • A conducting sphere in an alternating magnetic field

    Publication Year: 1967, Page(s):700 - 702
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    First Page of the Article
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  • Some remarks on geometrical considerations in the design of Hall-effect gyrators

    Publication Year: 1967, Page(s):702 - 703
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  • Strain sensitivity in Ni-Fe-Co thin films

    Publication Year: 1967, Page(s): 702
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (151 KB)

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  • Analysis of a balanced magnetic circuit as a memory element

    Publication Year: 1967, Page(s):703 - 704
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (191 KB)

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  • Determination of Tcin ferrimagnetic garnet materials

    Publication Year: 1967, Page(s): 705
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  • Use of the digital signal averager for delta noise measurements

    Publication Year: 1967, Page(s):705 - 706
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  • Contributors and back cover

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE

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