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IEEE Transactions on Magnetics

Issue 2 • March 1980

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Displaying Results 1 - 25 of 56
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Guest editorial

    Publication Year: 1980, Page(s): 171
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    Freely Available from IEEE
  • Progress in the development of ferromagnetic liquids

    Publication Year: 1980, Page(s):172 - 177
    Cited by:  Papers (24)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Factors affecting the stability of suspensions of ferromagnetic particles in non-conducting and metallic liquids are discussed. The preparation and properties of suspensions of Fe3O4particles and metallic particles in various liquids are discussed and the progress in the development of new ferromagnetic liquids reviewed. View full abstract»

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  • Preparation of dilution-stable aqueous magnetic fluids

    Publication Year: 1980, Page(s):178 - 183
    Cited by:  Papers (159)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    As part of its program in advancing mineral technology, the Bureau of Mines, U.S. Department of the Interior, has investigated the production of water-base magnetic fluids that are stable toward dilution, and therefore fit for mineral and material beneficiation. Extension of the Bureau developed peptization technique for kerosine-base magnetic fluids to the preparation of the aqueous variety was p... View full abstract»

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  • Properties of magnetic fluid particles

    Publication Year: 1980, Page(s):184 - 190
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    Very fine particles of magnetite, nickel ferrite, and cobalt ferrite were produced by grinding coarser powders in a ball mill with a carrier fluid and a surfactant. The particles were examined by means of chemical analysis, electron microscopy, x-ray diffraction, magnetic measurements, and Mössbauer spectroscopy. Properties were determined before and after removing the surfactant coating. The... View full abstract»

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  • Aggregate formation in metallic ferromagnetic liquids

    Publication Year: 1980, Page(s):191 - 196
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Ferromagnetic liquids containing 45A diameter tin or antimony coated iron particles dispersed in mercury have been prepared electrolytically. The fluids are found to have a magnetisation which is time dependent when an applied field is abruptly reduced. The characteristic decay time which is of the order of 60s cannot be attributed to magnetisation changes due to small noninteracting particles of ... View full abstract»

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  • Concentration-dependent correlations in ferrofluids studied by small-angle scattering of synchrotron X-radiation

    Publication Year: 1980, Page(s):197 - 202
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Small-angle X-ray scattering has been used to study correlations between the magnetic grains of ferrofluids : for dilute colloïids, the grains look isolated or associated in dimers, trimers, etc ... depending on the nature of the ferrofluids. At higher concentration, an order appears in the spatial distribution of the grains even without magnetic field. The application of a magnetic field can... View full abstract»

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  • Scattering and polarization of light by magnetic fluids

    Publication Year: 1980, Page(s):203 - 206
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Expression for the intensity and the degree of polarization of light scattered by a magnetic colloid are derived. Experimental results obtained by earlier investigators are discussed on the basis of these expressions. View full abstract»

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  • Continuum mechanics of a magnetically saturated fluid

    Publication Year: 1980, Page(s):207 - 210
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The physical properties of a magnetically saturated fluid are well accepted. This work is concerned with its continuous description. Using global balance law approach we first derive the differential equations and boundary conditions for continua with internal rotations of hydrodynamic as well as of magnetic origin. The constitutive relationships are then introduced which together with the foregoi... View full abstract»

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  • Theory of ultrasonic attenuation in magnetic fluids

    Publication Year: 1980, Page(s):211 - 213
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Recent ultrasonic measurements have yielded anomalous results for the velocity and attenuation in magnetic fluids as a function of the applied field. Thus far, the experimental results have not been satisfactorily explained by a theoretical model. In the present paper, starting with Tarapov's ferrohydro-dynamical equations, we attempt to derive an expression for the ultrasonic attenuation. Numeric... View full abstract»

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  • Mathematical theory of non-linear waves on the surface of a magnetic fluid

    Publication Year: 1980, Page(s):214 - 220
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Consider a ferrofluid occupying the region z \leq 0 . If the fluid is subjected to a sufficiently strong magnetic field, surface waves appear. Under certain assumptions we shall prove that when the field strength becomes greater than a critical strength, a nontrivial wave solution on the surface of the ferrofluid bifurcates from the trivial solution. We then ... View full abstract»

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  • The origin of magnetic birefringence and dichroism in magnetic fluids

    Publication Year: 1980, Page(s):221 - 225
    Cited by:  Papers (117)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The optical birefringence and dichroism observed in magnetic fluids when subjected to a magnetic field are generally ascribed to orientation of the particles, to anisotropic spatial ordering, or to string formation. Magnitude, concentration- and time dependence of the anisotropies predicted by these mechanisms are compared with the available experimental data. This leads to the conclusion that ori... View full abstract»

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  • New phenomena in barbotage and sedimentation in magnetic fluids

    Publication Year: 1980, Page(s):226 - 232
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    New multivelocity model was deduced for a dispersive magnetizable medium: magnetic fluid - gas bubbles or solid particles. Resulting equations may be used for discribing the processes of concentration, separation and barbotage. The characteristics of deduced set were examined. The problem was solved concerning floatation and sedimentation of particles or babbles in a magnetic fluid in a solenoidal... View full abstract»

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  • Experimental investigations of magnetic fluids

    Publication Year: 1980, Page(s):237 - 250
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1752 KB)

    First Page of the Article
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  • Phase diagrams of model magnetofluids

    Publication Year: 1980, Page(s):233 - 236
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A model of ferrofluids is treated analytically and numerically in order to discuss the phase diagrams. Magnetic particles are supposed to sit on a lattice and to interact through a magnetic Kac potential and through a short range potential between nearest neighbours. The equation of state and the phase diagrams of such one and two dimensional ferrofluids are presented and discussed. View full abstract»

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  • Review of agglomeration in ferrofluids

    Publication Year: 1980, Page(s):251 - 253
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Ideally, magnetic colloids have sufficient surfactant and thermal agitation to prevent the agglomeration of the particles. However, agglomeration has been observed in light scattering, light microscope observations, pulsed magnetization measurements, and gravitational settling experiments. Agglomerate sizes have ranged from a chain of a few particles to ellipsoidal clumps of more than 10... View full abstract»

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  • Dielectric behaviour of a ferrofluid subjected to a uniform magnetic field

    Publication Year: 1980, Page(s):254 - 257
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The electric susceptibility of samples of ferrofluids subjected to a uniform magnetic field H was measured. The electric susceptibility \chi is dependent on the magnitude of the magnetic field and on the relative direction between the electric field E and the magnetic field View full abstract»

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  • Inversion in magneto-optical effects

    Publication Year: 1980, Page(s):258 - 261
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Magnetically induced birefringence and dichroism in certain colloidal suspensions exhibit inversion in sign of the effect. The paper discusses various mechanisms which may give rise to such effects. Methods are suggested to trace origin of such inversions. Certain theoretical and experimental results are also discussed. View full abstract»

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  • New determination of the liquidus line of AuCo by magnetic measurements

    Publication Year: 1980, Page(s):262 - 265
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Magnetic measurements of Au-Co alloys at high temperatures are presented. They prove that Au73Co27 is not the eutectic alloy but a hypereutectic one; the phase diagram is corrected and the eutectic composition is determined: 24.2 ± .2 at. % Co. Magnetic measurements of the eutectic alloy indicate the existence of small Co-clusters in the liquid state only a few degrees above the eutectic temp... View full abstract»

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  • Ferronematic lyotropic

    Publication Year: 1980, Page(s):266 - 269
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Combination of ferrofluids and liquid crystals has been possible using a nematic lyotropic phase which is an aqueous micellar system and a water base ferrofluid. A stable product results which can be oriented in magnetic fields of several Gauss, i.e. 103times lower than for the initial liquid crystal. Cholesterization has been possible on the same material. View full abstract»

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  • The Landau and Lifshitz hydrostatic "pressure" p(ρ,T) exemplified by thought experiments

    Publication Year: 1980, Page(s):270 - 274
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The density-related, Landau and Lifshitz hydrostatic "pressure" p(ρ,T), appearing in the modern literature on the stresses in polarizable fluids, and known also as the Abraham-Becker hydrostatic "pressure", is examined in a thought experiment. Fluid in a rectangular channel is put through a cyclic magnetization and dilatation process at constant temperature. A very direct solution for p(ρ... View full abstract»

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  • Stability of magnetic fluid penetration through a porous medium with uniform magnetic field oblique to the interface

    Publication Year: 1980, Page(s):275 - 282
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Recent work has shown that the fingering instability, which develops when a more viscous fluid is pushed through the voids of a porous medium or through a Hele-Shaw cell by a less viscous fluid, can be prevented if a magnetic field is applied tangential to a flat fluid interface separating magnetizable and non-magnetizable fluids. This earlier work is extended here by considering equilibrium magne... View full abstract»

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  • Ferrofluid flow under the influence of rotating magnetic fields

    Publication Year: 1980, Page(s):283 - 287
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Experimental data are presented concerning the physical mechanism of the electromagnetically induced macroscopic rotation of ferrofluids. The rotating velocity distributions, determined using a DISA anemometer equipment and a tensometric transducer system, showed a very different behaviour of ferrofluids in a low frequency (0 + 10 Hz) rotating magnetic field in comparison with that observed in the... View full abstract»

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  • Instabilities of magnetic fluids leading to a rupture of continuity

    Publication Year: 1980, Page(s):288 - 297
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1432 KB)

    In the present paper attention is focused on topological instabilities of magnetic fluids. The authors review various studies concerned with the magnetic fluid instabilities leading to disintegration of the initial fluid volume. View full abstract»

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  • A dissipative process in ferrofluid in non-homogeneous magnetic field

    Publication Year: 1980, Page(s):298 - 300
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Equations of motion of ferrofluid in non-homogenious magnetic field are derived, and it is shown that due to the orientational relaxation of suspesion particles, additional dissipative terms appear in this equations proportional to the velocity and the angular velocity of ferrofluid. Additional kinetic coefficients are found as functions of magnetic field and temperature by means of the approximat... 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