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IEEE Transactions on Magnetics

Issue 2 • Date June 1971

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

    Publication Year: 1971, Page(s): 0
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  • Calculation of intrinsic coercivity of magnetic domain walls in perfect crystals

    Publication Year: 1971, Page(s):226 - 230
    Cited by:  Papers (101)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The critical field strength at which a classical domain wall moves through a perfect ferromagnetic crystal of simplified structure is calculated as a function of the ratio between anisotropy energy K and ferromagnetic coupling energy C , taking into account the discrete nature of the spins. When View full abstract»

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  • On the effect of strain on the coercive force of some Fe-Ni alloys under tensile stress

    Publication Year: 1971, Page(s):230 - 233
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The behavior of the coercive force of two Fe-Ni alloys with 51 and 72 percent Ni as a function of plastic strain was studied, both with a static tensile stress applied and released. It was found that the coercive force depends on the interaction between dislocations and 180° domain walls when the tensile stress was applied, and therefore increases linearly with the square root of the strain. ... View full abstract»

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  • Electrodeposited closed flux memory

    Publication Year: 1971, Page(s):233 - 236
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A magnetic memory is described that can be produced by batch fabrication techniques in some respects similar to those developed for the production of semiconductors. Drive requirements and sense signals are such as to make this approach completely compatible with integrated circuits. Production and operation of the device is explained and the functioning of a complete memory system is discussed. View full abstract»

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  • A high speed push-pull analog memory using transfluxors

    Publication Year: 1971, Page(s):236 - 240
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A two-transfluxor analog memory is described. It uses single coincident-current pulses on separate signal and bais windings to store a flux level analogous to the input signal sample in about 10 μs. An additional winding senses the set flux level and permits further linearization of the storage characteristic by means of negative feedback. View full abstract»

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  • A self-consistent calculation of the magnetic transition recorded on a thin film disk

    Publication Year: 1971, Page(s):240 - 243
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We have extended the self-consistent calculation of a magnetic transition recorded on a thin film disk to where the head has been removed. The calculated transition width is compared with experiment and its functional dependences on the magnetic parameters of the medium are compared with previous theories. View full abstract»

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  • Theoretical analysis of contact printing on magnetic tape

    Publication Year: 1971, Page(s):244 - 248
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The magnetization process in contact printing is considered to be the same process as an ideal anhysteretic magnetization process. In the anhysteretic magnetization process a self-demagnetization effect by an internal field is an important factor, especially at short wavelength. Therefore, the internal field effect should be evaluated dynamically depending on the instantaneous strength of the dimi... View full abstract»

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  • A computer simulation of unbiased sine wave recording

    Publication Year: 1971, Page(s):249 - 254
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A computer simulation is described which uses the approximation that the output voltage derives from longitudinal tape magnetization acquired solely from the longitudinal head field. Using a simple noninteracting M_{r}-H model, the remanent state of 200 points per half-wavelength of tape is calculated by following each point's field history as it passes the r... View full abstract»

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  • Theoretical signal-to-noise ratios for magnetic tape heads

    Publication Year: 1971, Page(s):254 - 259
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The signal-to-noise ratio of a magnetic tape reproduce system is discussed. An expression for the theoretical value of the signal-to-average-band-limited-noise is developed in terms of the statistical properties of the signal and the probable noise sources. The concept of power spectral density is used to simplify the discussion and to develop insight into system behavior. The resultant system equ... View full abstract»

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  • Orientation of magnetic particles in a recording medium

    Publication Year: 1971, Page(s):259 - 262
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The theory of the motion of magnetic particles in a viscous Newtonian medium, first outlined by Newman and Yar-brough, has been extended to include both low and high field orientation modes. It is shown that the equations of motion can be solved analytically, i.e., without resort to numerical integration. The results of the analysis are used to predict values for easily measured parameters of reco... View full abstract»

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  • Magnetic anisotropy of thin metallic film tapes deposited at oblique incidence

    Publication Year: 1971, Page(s):263 - 267
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The origin of magnetic anisotropy of thin films deposited at oblique incidence is investigated. Electron micrographs of such films prepared at various incident angles demonstrate a characteristic particle structure. A model of the film developed on this basis is composed of identical elongated rotation ellipsoids whose long axes are oriented parallel to the beam direction. The energy density View full abstract»

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  • Optimum thermal compensation axes in YIG and GaYIG ferrimagnetic spheres

    Publication Year: 1971, Page(s):267 - 276
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    A new measurement technique using a bandpass filter structure, called a filter-orienter, allows determination of magnetic properties of single crystal ferrimagnetic samples at arbitrary crystallographic directions. Materials properties can be conveniently measured over several octaves in field and over a considerable temperature rang. This technique was utilized to examine the ferromagnetic resona... View full abstract»

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  • Temperature stability of ferrite substrates in microwave integrated circuits

    Publication Year: 1971, Page(s):276 - 280
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    With the increasing use of ferrites in microwave integrated circuits, it becomes important to determine the temperature stability of the effective values of dielectric constant and unmagnetized permeability of ferrites in this application. This paper reports the results of such measurements on several ferrites. The test samples were slabs 2 × 0.5 × 0.032 in. In order to provide a basis f... View full abstract»

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  • Characterization of samarium-cobalt TWT magnets

    Publication Year: 1971, Page(s):281 - 285
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Since the development of high-energy product Sm-Co magnets, ring type Sin-Co magnets have been producted for TWTs at Raytheon. A direct correlation between hysteresis loop measurements and the functional measurements made on the periodic permanent magnet (PPM) stacks of TWT ring magnets is highly desirable. A vibrating sample magnetometer which is capable of measuring the View full abstract»

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  • Measurement of magnetic properties of cobalt-rare earth permanent magnets

    Publication Year: 1971, Page(s):285 - 291
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Co-rare earth permanent magnets generally display a high intrinsic coercive force. In order to make magnetic measurements with such materials fully saturated, we have found it necessary to use magnetizing fields in excess of 50 kOe. The superconducting solenoid is ideally suited for generating such fields. In this study, we have used a 100 kOe Nb3-Sn superconducting solenoid for magneti... View full abstract»

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  • Magnetic properties of cobalt-rare earth magnets for microwave applications

    Publication Year: 1971, Page(s):291 - 294
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A family of sintered Co-rare earth alloys utilizing Sm, Pr, La, or Ce mischmetal has been developed. Each alloy is designed to optimize one of the following characteristics: 1) Magnets which exhibit magnetic energy products in excess of 20 MG . Oe; 2) Magnets which exhibit reversible demagnetization behavior in adverse fields up to 14 000 Oe; 3) Magnets using inexpensive rare earth metals to maxim... View full abstract»

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  • Permanent magnet utilization criteria in a DC motor

    Publication Year: 1971, Page(s):295 - 297
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    In a dc motor with permanent magnet stator, the mean no-load working point of the magnet material can, after stabilization by stall current, be represented by a point B_{m},H_{m} on a recoil line inside the demagnetization curve. The point results from the application during stall of an effective mean field Hadue to armature reaction in addition to... View full abstract»

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  • Improvement of turn-off performance of series-connected thyristors by magnetic components

    Publication Year: 1971, Page(s):297 - 304
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Conventional voltage sharing networks for series-connected thyristors have serious deficiencies with forced commutation. It is shown that great improvement in turn-off performance over that attainable with the usual shunt resistive and capacitive components can be achieved by using an additional series saturating inductor, transformer(s) connected across the thyristors, or a combination of these. ... View full abstract»

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  • Analog approximations of transient flux diffusion

    Publication Year: 1971, Page(s):304 - 308
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The diffusion of stray magnetic fields into conductors is modeled. By considering only the perpendicular axis of a planar magnetic film, then by assuming a rectangular approximation to the stray flux density, the analysis is greatly simplified while identifying the dominant aspects of the interaction. Use of analogous RC transmission line equations permits the representation of instantaneous film ... View full abstract»

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  • Correction to "Anisotropy of wall energy in orthoferrites"

    Publication Year: 1971, Page(s): 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    First Page of the Article
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  • Magnetization of Ni-Fe-Mo Electrolytic films at low temperatures

    Publication Year: 1971, Page(s):309 - 310
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    H_{c}, J_{s} , and Jrwere measured on Ni-Fe-Mo films at low temperatures. As the temperature dropped from 300 to 80°K, the Hccoercive field of Ni-Fe-Mo films with 0 percent content of Mo decreases from 1800 to 680 A/m. On the contrary, for the films with 5 and 10 percent Mo, the Hcincreases. The magnetization J... View full abstract»

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  • Noise from anhysteretic remanence in magnetic tapes

    Publication Year: 1971, Page(s):312 - 315
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A technique is described for producing anhysteretic remanent magnetization (ARM) in situ on an endless loop tape recorder. A comparison of noise from ARM with dc noise, arising from room temperature isothermal remanent magnetization (IRM) is presented in the form of demagnetization curves. By these methods, tape properties can be studied under conditions simulating "ideal" ac biased recording. View full abstract»

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  • Magnetic properties of mismatched coupled films

    Publication Year: 1971, Page(s):315 - 316
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Magnetically coupled thin films have proven useful in the development of high density NDRO magnetic thin film memory devices. This communication reports the variation in magnetic properties of both films comprising the film pair as a function of the interlayer thickness. View full abstract»

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  • Experimental study of core noise in various ferromagnetic materials

    Publication Year: 1971, Page(s):316 - 319
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1971, 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.

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Meet Our Editors

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