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IEEE Transactions on Magnetics

Issue 3 • September 1973

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Displaying Results 1 - 25 of 116
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • 1973 INTERMAG keynote address: NBS - The magnetic domain

    Publication Year: 1973, Page(s):152 - 155
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    Freely Available from IEEE
  • 1973 Intermag

    Publication Year: 1973, Page(s): 151
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    First Page of the Article
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  • Structure and stability of SmCo5

    Publication Year: 1973, Page(s):156 - 158
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The structure of SmCo5has been investigated between 500°C and its melting point. It is found that SmCo5is a composite of two phases. One of them is unstable and decomposes below 1150°C giving rise to the neighboring phase Sm2Co17. No traces of Sm2Co7have been observed during this decomposition. The reaction of SmCo... View full abstract»

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  • Phase analysis of liquid-phase sintered Co5Sm magnet compacts

    Publication Year: 1973, Page(s):158 - 160
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The purpose of this work is to determine the phases present in liquid-phase sintered Co5Sm magnets. Specimens sintered at 1100°C and given subsequent thermal treatments were examined by optical metallography, electron microprobe, and X-ray diffraction techniques. The results of this work suggest that these materials do not exhibit an equilibrium configuration of phases. View full abstract»

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  • A model for the field dependence of magnetization discontinuities in high-anisotropy materials

    Publication Year: 1973, Page(s):161 - 164
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A simple model involving two types of nuclei, neither with any unusual or unsymmetrical properties, can describe a large variety of phenomena related to the field dependence of coercive force in powders and nucleating fields in single particles of high-anisotropy materials, including orthoferrites and hexagonal oxides as well as cobalt-rare-earths. One type of nucleus is a domain wall trap that is... View full abstract»

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  • The influence of surface conditions on the coercive force of SmCo5particles

    Publication Year: 1973, Page(s):164 - 167
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The magnetic properties of single crystals of SmCo5have been studied. The spontaneous magnetization was 894 emu/cm3at room temperature. The process of magnetization reversal was extremely sensitive to the surface condition. The magnetization reversal process for spheres with rough surfaces was dominated by free wall motion, while the magnetization for spheres with the smoothe... View full abstract»

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  • Some observations of the magnetic properties of fluid-quenched Co5Sm magnets

    Publication Year: 1973, Page(s):168 - 171
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The purpose of this work was to study the effect of different quenching rates from 900°C on the magnetic properties of liquid-phase sintered Co5Sm magnets. Various fluids with different thermal conductivities were used to achieve different cooling rates. Interpretations of this behavior were warranted in terms of the microstructures and chemical compositions of the samples examined... View full abstract»

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  • Thermally activated domain wall motion

    Publication Year: 1973, Page(s):171 - 173
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A theory of thermally activated domain wall motion is presented in which attention is focused on the functional form of the domain wall energy variation in the direction of motion. It is shown that in general the activation volume is magnetic field dependent, and not necessarily constant, as is often assumed. A simple power law form of the wall energy variation, due to sample inhomogeneities, is f... View full abstract»

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  • An efficient flexible buffered memory system

    Publication Year: 1973, Page(s):173 - 179
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A flexible low cost multiclass memory system has been evaluated and constructed to accommodate memory sizes from 128 000 to 4 000 000 ten-bit bytes. For 1.2 to 1.5 μs cycle time memory modules, typical system cycle times range from 0.25 to 0.40 μs. Provision is made for conveniently varying the block size, the number of blocks per class, and the number of classes. An efficient directory ... View full abstract»

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  • Recording with magnetic bubbles

    Publication Year: 1973, Page(s):179 - 182
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    We propose to use the stray field of a magnetic domain (e.g, a bubble) for magnetic recording. It is shown that these stray fields are large enough to write information into a conventional disc or tape. An experiment in which an audio signal is recorded on a conventional tape with the aid of a stripe domain is described. We consider the feasibility of an integrated recording head for "one head per... View full abstract»

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  • Fabrication and properties of Fe/Fe oxide and Co/Co oxide films

    Publication Year: 1973, Page(s):183 - 185
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Evaporation of Fe and Co at a residual O2pressure of 10-5to 10-4Torr yielded magnetic films of high coercivities up to 500 Oe and magnetizations of about 1000 EMU/cm3. While the Co films were continuously deposited in the O2atmosphere, a sandwich structure of Fe and Fe2O3was formed by intermittently altering the evaporati... View full abstract»

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  • A new high Hcgamma ferric oxide exhibiting coercive force as high as 450-470 Oe

    Publication Year: 1973, Page(s):185 - 188
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The basic properties of a new high Hcgamma ferric oxide (γ-HY) exhibiting coercive force as high as 450 ∼ 470 Oe were compared with those of conventional gamma ferric oxide (γ-LOP). The average axial ratio was 9 : 1 and the average number of pores was 0.2 per one particle for γ-HY. The pigment volume concentration was 15% increased and the gloss of tape surface 25% ... View full abstract»

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  • On the texture of γFe2O3particles in magnetically and mechanically oriented magnetic tape

    Publication Year: 1973, Page(s):188 - 191
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The degree of preferred orientation in magnetic recording tape was investigated by an X-ray pole figure technique and by measuring magnetic properties. Acicular γFe2O3particles dispersed in PVA film were oriented by mechanical stretching and magnetic orientation. The pole figures of these samples indicated the texture with [110] to the orientating direction. The degree o... View full abstract»

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  • A magnetic recording tape based on iron particles

    Publication Year: 1973, Page(s):191 - 194
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Tapes based on acicular iron particles give an outstanding recording performance compared to γ-Fe2O3and CrO2tapes. Especially in the short wavelength region the signal to noise ratio is, respectively, 12 and 7 dB better, whereas the bias noise level is somewhat lower. The iron tapes have a high coercivity, between 80 and ... View full abstract»

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  • Magnetic properties of Co5Sm-Lodex and Co5Sm-lead composites

    Publication Year: 1973, Page(s):194 - 197
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Demagnetization curves were recorded for composites of 1) Co5Sm and Lodex, 2) Co5Sm and lead, and 3) two different Co5Sm powders of widely different Hcivalues. "Kinks" observed for the first and third composites but not the second show that the effect results from the difference in Hci. The Co5Sm-Lodex composites produced "kinks" in... View full abstract»

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  • Observation of magnetic domains in NdCo5using an electro-etching technique

    Publication Year: 1973, Page(s):197 - 201
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    Magnetic domains have been observed in NdCo5using an electro-etching technique. Electro-etching in an applied magnetic filed yields a surface record of the field related domain structure that can be viewed using a light microscope without polarizers. High contrast between oppositely magnetized domains can be obtained on surfaces both parallel and perpendicular to the ... View full abstract»

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  • The observation of domain structures in SmCo5by electron microscopy

    Publication Year: 1973, Page(s):201 - 203
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    In situ observations of the domain structure of SmCo5under changing magnetic field conditions have been carried out with a high-voltage electron microscope. These observations demonstrate the existence of some pinning processes and suggest that while pinning at crystallographic defects may have some significance, that at grain boundaries may be more important. Such a view is supported b... View full abstract»

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  • Influence of cerium content on the structure and magnetic behavior of Co-Fe-Cu-Ce permanent magnets

    Publication Year: 1973, Page(s):203 - 205
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    As part of a continuing program to understand and optimize the magnetic behavior of Co-Fe-Cu-Ce permanent magnet alloys, we have made studies on the alloy system Co3.5Fe0.5CuCexwith x in the range 0.8 to 1.2. An alloy of x = 1 had previously been studied in detail and found to have good permanent magnet properties. In the present work, it was found that when x >... View full abstract»

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  • The structure of Co-Cu-Fe-Ce permanent magnets

    Publication Year: 1973, Page(s):205 - 209
    Cited by:  Papers (29)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1240 KB)

    The precipitates responsible for magnetic age hardening of a Co3.8Cu0.9Fe0.5Ce alloy have been directly observed by transmission electron microscopy. The precipitates are coherent, plate shaped disks which possess the rhombohedral Co17Ce2structure. They form in a [001] plate normal orientation and cluster in staggered rows at ... View full abstract»

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  • Quantitative considerations to self-centering magnetic suspensions with permanent magnets

    Publication Year: 1973, Page(s):210 - 214
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Center containment and simultaneous support of rotating bodies by forces between two permanent magnets has become a technical reality due to high-coercive force magnets. The Self-Centering principle is described and experimental results are reported as examples for the advantages of the new arrangement over conventional magnetic bearings. Performance tests of prototype units are described concerni... View full abstract»

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  • Magnetic interactions in pseudobinary rare earth-3d intermetallics

    Publication Year: 1973, Page(s):214 - 217
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Magnetic measurements on pseudobinary intermetallic compounds of the series R(MnxFe1-x)2(R = Y, Gd, Er) R6(MnxFe1-x)23(R = Y, Gd, Tb, Dy, Ho, Er, Tm) R2(FexCo1-x)17(R = Y, Gd, Dy) R2(FexNi1-x)17(R = Y, Gd) are reported. Magnetization a... View full abstract»

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  • Neutron diffraction study of the Th(Co1-xFex)5alloys

    Publication Year: 1973, Page(s):217 - 220
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    We have studied the ordering of Fe atoms and the magnetic properties of Th(Co1-xFex)5alloys with the CaCu5- type structure. From the neutron diffraction analysis it is concluded that the larger Fe atoms prefer to occupy the site ... View full abstract»

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  • Measurement of weak magnetic fields using zero-field parametric resonance in optically pumped He4

    Publication Year: 1973, Page(s):221 - 226
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A vector magnetometer has been built utilizing the n = 0, p = 1 parametric resonance associated with zero-field level crossings in the optically pumped 23S1level of He4. The principles of operation are discussed and performance is described. The parametric resonance signal-to-noise ratio is 3.5 × 104in a 0.5 Hz... View full abstract»

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  • Lunar surface magnetometers

    Publication Year: 1973, Page(s):226 - 231
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Magnetometers have been placed on the moon by astronauts of the Apollo 12, 14, 15, and 16 missions. These instruments have measured permanent fields due to fossil magnetic material in the lunar crust and transient fields due to electrical eddy currents generated in the lunar interior. A stationary magnetometer which transmits data continuously was flown on each of the Apollo 12, 15, and 16 mission... 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