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IEEE Transactions on Magnetics

Issue 4 • Date December 1965

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Displaying Results 1 - 25 of 41
  • [Front cover and table of contents]

    Publication Year: 1965, Page(s): 0
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    Freely Available from IEEE
  • Administrative committee members

    Publication Year: 1965, Page(s): 245
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    Freely Available from IEEE
  • An electroplated 84Fe-5Ni-11Cu isotropic thin film for the cubic waffle-iron

    Publication Year: 1965, Page(s):246 - 250
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    The information storage media in the cubic waffle-iron memory is a square loop, isotropic, medium coercive force planar film called the overlay, which is placed in contact with ferrite posts. An 84Fe-5Ni-11Cu alloy has been developed to meet the requirements of the waffle-iron overlay. The film is electrodeposited on a specially prepared 2 frac{1}/{2} by View full abstract»

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  • Magnetostatic wall interaction effects in multilayer films

    Publication Year: 1965, Page(s):251 - 253
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The critical film thickness for Bloch-Néel (B-N) wall-type transition has previously been determined experimentally for the configuration of two parallel and equally thick 81 percent Ni-19 percent Fe films separated by a nonferromagnetic layer of SiO as a function of the thickness of the separating layer. The experimental results are interpreted assuming a simple coupled-wall model and using ... View full abstract»

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  • Dependence of coercivity on driving field in multilayer films of nickel

    Publication Year: 1965, Page(s):254 - 257
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The variation in the coercivity of magnetization loops of multilayer films of nickel was investigated as function of the rate of rise r in the applied magnetic field. The films were prepared by deposition of nickel and copper alternately in a vacuum of 2 \times 10^{-6} mm of Hg on to substrates made of thin aluminium foil... View full abstract»

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  • Switching processes in thin ferromagnetic film memory elements

    Publication Year: 1965, Page(s):258 - 262
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The switching properties of small, rectangular areas of thin ferromagnetic films, relevant to their utilization as memory elements in digital computers, are discussed. An attempt is made to derive the switching properties theoretically by superposition of the calculated demagnetizing field effects upon the known intrinsic film properties. Experiments performed using homogeneous quasi-static applie... View full abstract»

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  • Temperature effects on film memory drive current margins

    Publication Year: 1965, Page(s):263 - 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Negligible reversible changes in magnetic properties of thin metallic films exhibiting high Curie temperatures are expected over normally encountered temperature ranges. However, irreversible changes of the magnetic properties of vacuum-deposited films have been observed when they are subjected to high magnetic fields at temperatures in the order of 100°C. A similar effect is also observed in... View full abstract»

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  • Permalloy film NDRO memory

    Publication Year: 1965, Page(s):266 - 271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    A thin magnetic film NDRO storage cell has been developed for very high-speed word-organized memories. The storage cell contains two 500-Å, 15-mil-square Permalloy film elements with a read and sense line between them. One film element is deposited on a metallic ground plane, so that the read line and its image in the ground plane are coupled to the readout film and decoupled from the storage... View full abstract»

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  • Integrated transmission lines for magnetic thin film memories

    Publication Year: 1965, Page(s):272 - 276
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The pulse transmission properties of integrated strip lines are examined for a structure that has been proposed for application in a large capacity, high-speed magnetic film memory. The lines are vacuum-deposited onto an insulated ground plane and are characterized by low impedances. Previous analyses, such as those given by Eastman and Chang, McQuillan, and Harloff, examine the effects of skin-de... View full abstract»

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  • Uniaxial anisotropy by "radiomagnetic" treatment; controlling factors in a new process

    Publication Year: 1965, Page(s):277 - 280
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A new process-an electron-"radiomagnetic" treatment-for obtaining high-remanence, low-coercive-force loops in magnetic alloys was recently announced. As an example, 2-MeV electron irradiation of 6-mil-thick ring laminations of polycrystalline 5-80 Mo Permalloy with 1017e/cm2in an applied circumferential magnetic field of 0.2 Oe at ... View full abstract»

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  • A magnetic shift register employing controlled domain wall motion

    Publication Year: 1965, Page(s):281 - 284
    Cited by:  Papers (6)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A shift register based on controlled domain wall propagation in a magnetic wire with an axial easy direction has been developed. The operational characteristics of an experimental model are discussed. Some hard drawn magnetic materials have been shown to have at least a 3-to-1 nucleation-to-propagation threshold field window over several hundred foot lengths of wire which guarantees operation, Thi... View full abstract»

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  • Wide PRIME-current range for all-magnetic shift registers

    Publication Year: 1965, Page(s):285 - 292
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    In an all-magnetic resistance-type shift register, a PRIME current pulse i_{p}(t) , of amplitude Ip, is applied to Npand Nbturns through the minor and major apertures, respectively. For given operation frequency ... View full abstract»

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  • Phenomenological model for the BIAX

    Publication Year: 1965, Page(s):292 - 295
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    This paper describes a model developed for the operation of the BIAX as applicable to an NDRO memory system. The role of a field transverse to the storage direction during writing is described. Factors contributing to the output and to the back voltage are pointed out to explain the ratio observed between these two. These individual contributions arise from rotation of the magnetization vector and... View full abstract»

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  • Sampling and analog recording with square-loop magnetic devices

    Publication Year: 1965, Page(s):296 - 299
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Square-loop magnetic devices have been used traditionally in digital circuitry. Methods by which a combination of the square-loop and time-limited switching properties of magnetic devices can be used to sample and record a transient signal are described. These circuit functions have been previously performed by rather complicated electronic means. Magnetic sampling and recording has several advant... View full abstract»

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  • The theory of ratchet writing in multipath magnetic cores

    Publication Year: 1965, Page(s):299 - 308
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Ratchet writing is a method of writing information into certain nondestructive-readout (NDRO) magnetic memory elements. Writing is accomplished by reversing (or "ratcheting") the flux about one hole of the element with a word-oriented wire while simultaneously applying information-determined bit current to another hole called the storage hole. The effect of ratcheting is a threshold reduction for ... View full abstract»

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  • Switching properties of a partially set square-loop ferrite core

    Publication Year: 1965, Page(s):309 - 314
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The switching properties of a partially set square-loop ferrite core depend not only upon the initial flux level, but also upon how that flux level was attained, and are therefore complex. Experimental results that describe some of this history dependence are presented. A thin-ring core ( OD/ID = 1.10 ) was partially set by switching it from negative remanenc... View full abstract»

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  • Technique for determining the speed capabilities of 2D ferrite core memories

    Publication Year: 1965, Page(s):315 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    A new and powerful method has been developed which makes possible an analytical study of the sensitivity of 2D memory cycle times to most of the pertinent memory variables. Worst-case conditions in a 2D ferrite core memory have been considered. The analysis allows independent variations (from nominal) of all drive pulse amplitudes and widths, plus variations in the thresholds of the cores caused b... View full abstract»

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  • Measurement of useful properties of memory devices

    Publication Year: 1965, Page(s):320 - 323
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    It is customary to measure properties of a memory device in terms of a specific mode of memory operation. Estimating device properties relevant to a different operating mode is usually difficult, if not impossible. At the present time, memory configurations are growing in number and in basic function, ranging widely in size, speed, power, and read/write patterns. It is often necessary to select an... View full abstract»

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  • Continuous sheet sensing for random access memories

    Publication Year: 1965, Page(s):324 - 329
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Magnetic and superconductive random access memories contain arrays of flux storage elements or sites, each of which is intersected by two selection lines used to switch flux, and one sense line used to detect flux changes. The need to have three lines intersect at many storage locations produces severe alignment problems in the fabrication of high-density deposited film memories. This paper explai... View full abstract»

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  • Factors affecting the sensitivity of gamma-level ring-core magnetometers

    Publication Year: 1965, Page(s):330 - 337
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A theoretical and experimental analysis has been made of the geometrical and magnetic factors affecting the sensitivity of the ring-core magnetometer first introduced by Geyger in 1961. Using a drive-to-pickup transfer function derived from an assumed dynamic hysteresis loop and a given dc input signal, the second-harmonic output voltage was derived for both current-source and voltage-source drivi... View full abstract»

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  • On the analysis of second-harmonic modulators

    Publication Year: 1965, Page(s):337 - 341
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Analysis of magnetic modulators, which includes low-level transducer amplifiers and magnetometers, usually is based on control-signal displacement of fixed hysteresis loops of some particular shape. Experience shows, however, that many qualitative aspects of the device operation do not agree with the analysis. In this paper, an analysis is based on the d\phi/dt...
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  • A magnetic time division multiplexer for use in control circuits

    Publication Year: 1965, Page(s):341 - 343
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The essentially magnetic multiplexing system described uses saturable inductors and diodes interconnected so that sending and receiving ends of the information link operate as synchronous switches slaved to the ac line. The switching rate is proportional to the number of channels desired. The information may be encoded singly, simultaneously or serially; or in combination, simultaneously or serial... View full abstract»

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  • Digital recording properties of evaporated cobalt films

    Publication Year: 1965, Page(s):344 - 348
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Thin coatings of cobalt, cobalt-nickel, and cobalt-phosphorous have been in use for some years as a medium in recording drums. Recent papers [1]-[3] have described the recording properties of chemical- and electro-deposits on flexible plastic bases for in-contact digital tape recording. The BH loop squareness and high coercivities achievable in films of a few... View full abstract»

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  • A correlation between magnetic properties and recording behavior in metallic chemically deposited surfaces

    Publication Year: 1965, Page(s):348 - 352
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    One of the most intriguing problems in understanding the recording behavior of thin metallic surfaces is to determine the extent to which this behavior depends on and correlates with the magnetic properties of the surface. From the point of view of demagnetization it is obvious that the recording surface with the best high density resolution is one that has zero moment; unfortunately, this surface... View full abstract»

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  • A computer simulation of the magnetic recording process

    Publication Year: 1965, Page(s):352 - 357
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    This paper describes a new method of analyzing the saturation magnetic recording process using digital computer simulation techniques. This model closely simulates the physical system and avoids the usual mathematical approximating expressions for the various recording functions. In addition, automatic consideration of nonlinear effects such as recording demagnetization and finite recording curren... 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