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IEEE Transactions on Magnetics

Issue 1 • Date March 1971

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Displaying Results 1 - 25 of 30
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1971, Page(s): 3
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • Saturation magnetic recording process

    Publication Year: 1971, Page(s):4 - 16
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    This review of the saturation magnetic recording process is tutorial in approach. The emphasis throughout is on the development of intuitive understanding as well as the development of a first-order analysis (good to 10-20 percent) of the process. By means of treating two different functional approximations to the magnetization distribution in the medium, linear and arctangent, it is shown that th... View full abstract»

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  • Pulse transformers

    Publication Year: 1971, Page(s):17 - 28
    Cited by:  Papers (25)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1680 KB)

    Pulse transformers capable of transmitting substantially rectangular voltage pulses, with durations of less than one microsecond, were developed for radar applications during World War II. Their primary functions were to match the impedances of high-power microwave radio-frequency electron-tube generators to electronic pulse generators and coaxial transmission cables, and to provide polarity rever... View full abstract»

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  • Magnetostrictive phenomena in metallic materials and some of their device applications

    Publication Year: 1971, Page(s):29 - 48
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2672 KB)

    The phenomenon of magnetostriction, or the change in a body's dimensions during the magnetization process, was first reported by Joule. Since then, the interaction between strain and the magnetization process has been studied extensively, particularly in the magnetic metals and alloys that have been found to be of technological importance. The purpose of this paper is to review magnetostrictive ph... View full abstract»

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  • Iron and silicon-iron alloys

    Publication Year: 1971, Page(s):48 - 60
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1680 KB)

    The principal soft ferromagnetic materials in use today are still iron and silicon-iron alloys. Factors affecting magnetic properties of importance in practical use are evaluated and related to properties attainable in iron and electrical steels. Developments in metallurgy and technology leading up to the present status of com-merical materials in the principal categories of iron, low-carbon steel... View full abstract»

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  • Magnetic materials analyses by nuclear spectrometry: A joint approach to Mössbauer effect and nuclear magnetic resonance

    Publication Year: 1971, Page(s):61 - 91
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3208 KB)

    The common physical basis of the Mossbauer effect (ME) and the nuclear magnetic resonance (NMR) methods is shortly reviewed by discussing the relevant physical properties of nuclei and the interactions of atomic nuclei with electric and magnetic fields. A survey is given of the measurement methods. In principle all those properties of materials can be measured by ME and NMR which influence the ene... View full abstract»

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  • Soft magnetic structural alloys for elevated-temperature applications

    Publication Year: 1971, Page(s):91 - 102
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1872 KB)

    Metallurgical efforts to develop a soft magnetic material suitable for application in the rotor of a generator or motor in advanced aerospace electric systems are reviewed. Commercial materials which have been considered include AISI 4340 steel, H-11 steel, Nivco alloy, and 15- and 18-percent Ni maraging steels. Developments described have led to several new materials with combination of good mech... View full abstract»

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  • Review of magnetic properties of Fe-Ni alloys

    Publication Year: 1971, Page(s):102 - 113
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    During the past two decades, improved understanding of the fundamental magnetic behavior of Fe-Ni alloys has made them one of the most versatile class of soft magnetic materials. No longer is the concern limited to high permeability and low coercfve force at room temperature. Alloys have now been custom-crafted to meet high permeability requirements at cryogenic temperatures, exhibit a skewed hyst... View full abstract»

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  • Magnetomechanical effects in the Rayleigh region

    Publication Year: 1971, Page(s):113 - 133
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2616 KB)

    A brief résumé of basic magnetism is followed by a consideration of the magnetization process in the absence of applied mechanical stress, in which the importance of internal stresses and inclusions is emphasized and which leads to the introduction of Néel's disperse field theory. The Rayleigh laws are interpreted in terms of "Preisach loops." Early work on the influence of stress o... View full abstract»

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  • Parametric generation of acoustic waves and mode-locking of spin waves through magnetoelastic coupling

    Publication Year: 1971, Page(s):133 - 137
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A YIG disk with parallel and polished surfaces was bonded onto a quartz rod with a transducer attached to it. The YIG sample was placed in a microwave cavity in a parallel-pumping configuration. For microwave power several decibels above the threshold for spin-wave instability, parametric generation of low-frequency acoustic waves was observed, and was accompanied by the simultaneous appearance of... View full abstract»

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  • Acoustic Faraday rotation

    Publication Year: 1971, Page(s):138 - 141
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    In ferrimagnets, under a dc magnetic field, magnon-phonon coupling can result in such effects as acoustic birefringence and Faraday rotation. From our work on acoustic Faraday rotation in nonellipsoidal samples of YIG, we found three regions of rotation. The low field region has an internal magnetic field insufficient for effective phonon-magnon conversion. Fitting the rotation observed to the the... View full abstract»

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  • Stroboscopic observation of cylindrical domain propagation in a T-bar structure

    Publication Year: 1971, Page(s):142 - 145
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A technique of stroboscopic observation has been applied to the examination of the dynamic behavior of cylindrical magnetic domains, in a single crystal platelet of Sm0.55Tb0.45FeO3, propagating around a closed path Permalloy film T-bar structured overlay. Domain propagation is achieved by means of the time-varying magnetic pole configuration induced by a rotating ... View full abstract»

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  • Integrated magnetic recording heads

    Publication Year: 1971, Page(s):146 - 150
    Cited by:  Papers (27)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A new type of integrated magnetic recording head has been developed. The head is made completely from thin films by vacuum deposition through a mask. This technology enables us to make many heads in one vacuum cycle. A special study has been carried out on the geometrical forms and on the anisotropic magnetic material. The demagnetizing fields require that we make magnetostatic coupling layers for... View full abstract»

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  • A magnetoresistive readout transducer

    Publication Year: 1971, Page(s):150 - 154
    Cited by:  Papers (64)  |  Patents (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A new type of reproduce transducer for reading magnetically recorded tapes is described. The device structure, which utilizes the magnetoresistive effect in a thin magnetic film deposited onto a nonmagnetic substrate, provides wavelength response characteristics comparable to existing technology. Indigenous noise effects are subordinate to tape noise. No intrinsic frequency limitations are experie... View full abstract»

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  • Polymer-coated metal and alloy particles for magnetic recording

    Publication Year: 1971, Page(s):155 - 158
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Fine particles of cobalt and an iron-cobalt alloy were prepared and encapsulated in a plastic film to protect them from oxidation. The magnetic properties of the coated powders were determined and compared with the properties of coated iron powders studied previously. The thermal degradation of magnetic properties was also investigated. Polymer-coated iron and cobalt powders were incorporated in a... View full abstract»

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  • Calculations of external bit fields

    Publication Year: 1971, Page(s):158 - 162
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The amplitude and distribution of the external fields emanating from recorded transitions are of great interest to technologists in the field of information storage and retrieval and, more particularly, to those studying alternate readout techniques to the conventional inductive readout method. Such areas include the magnetic transfer process, Hall probe techniques, and the magneto-optic and Loren... View full abstract»

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  • Change of RF susceptibility and parametric oscillations of the magnetization of stripe films in magnetic fields normal to the surface

    Publication Year: 1971, Page(s):163 - 165
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Multidomain ferromagnetic resonance (FMR) for Permalloy magnetic fills (thickness 2700 Å) 83 percent Ni with rotatable anisotropy was experimentally observed with an external magnetic field applied normal to the sample surface. The lower frequency branch of multidomain FMR was excited when the RF magnetic field h was oriented along the film plane; for View full abstract»

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  • Influence of coercive force on low-frequency creep in bloch-wall permalloy films

    Publication Year: 1971, Page(s):165 - 171
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A very high resolution Bitter pattern technique is used to observe the motion of Bloch walls in Permalloy films excited by slowly rising and slowly falling hard-axis fields. For low coercive force films, the basic motion consists of approximately equal and opposite jumps induced by simultaneous wall structure changes at two transition fields. Net motion begins with the application of small easy-ax... View full abstract»

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  • Magnetization spreading in a thin film memory

    Publication Year: 1971, Page(s):171 - 174
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The hard axis magnetic field distribution within the uniaxial magnetic film element of a thin film memory device is calculated. In the memory device considered, the driving stripline and magnetic film are located between a magnetic keeper and a conducting ground plane. The difficulty encountered in the keeper-ground plane problem arises from the requirement of satisfying boundary conditions at the... View full abstract»

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  • Application of ferrites by electrophoresis process as keepers on printed circuit wiring of thin-film memories

    Publication Year: 1971, Page(s):174 - 179
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A process for applying coatings to conductive materials by means of electrophoresis has been used for coating ferrites on printed circuit conductors as a magnetic keeper material for cylindrical thin film wire memories. This process is also known as electrocoating when used in this manner. The advantage of this process is the ability to obtain consistently a uniform coating of predetermined thickn... View full abstract»

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  • Some developments of electrodeposited wire analog memory

    Publication Year: 1971, Page(s):179 - 182
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The basic readout and write-in characteristics of NDRO analog memory elements composed of electrodeposited Permalloy wires were reported previously by the authors. The output signal was the second harmonic voltage of the interrogation sinusoidal-wave field (225 kHz) applied along the hard axis, and the amplitude was proportional to the product of the set flux level and square of the interrogation ... View full abstract»

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  • A gamma-level portable ring-core magnetometer

    Publication Year: 1971, Page(s):183 - 185
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A four-transistor circuit is described for a battery operated magnetometer that has 0.1γ resolution using 1-in diameter 4-79 or 6-81 Mo-Permalloy tape cores of 20-40 Mx capacity. The center-tapped drive winding also serves as the sense winding, simplifying the sensor assembly. Some signal-to-noise results are presented to illustrate the fairly wide difference that may exist between cores of t... View full abstract»

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  • Computation and modeling of eddy currents in tape-wound square-loop cores

    Publication Year: 1971, Page(s):185 - 197
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1960 KB)

    Eddy currents in tape-wound cores are classified into microscopic and macroscopic eddy currents. The latter, denoted by ie, exists during mode II among three switching modes. Inherent peak ... View full abstract»

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  • Measurement of losses in saturated solid magnetic cores

    Publication Year: 1971, Page(s):198 - 201
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A new method of measuring the losses in saturated solid magnetic cores subjected to alternating magnetization is described. The method is based on the measurement of an alternative Poynting vector in the region between the surface of the iron core and the magnetizing winding. The two constituent components of this power-flow vector are the partial electric field and the magnetic field. A brief des... 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