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IEEE Transactions on Magnetics

Issue 2 • June 1970

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Displaying Results 1 - 25 of 97
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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  • Introduction to the second European conference on hard magnetic materials

    Publication Year: 1970, Page(s): 152
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    Freely Available from IEEE
  • Sublattice magnetization and cation distribution in BaMg2Fe16O27(Mg2W) ferrite

    Publication Year: 1970, Page(s):158 - 161
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (421 KB)

    Mössbauer measurements were carried out in compound BaMg2Fe16O27(Mg2W) by utilizing both polycrystalline and single-crystal samples. The resonant γ-absorption spectra have been measured with the absorbers at temperatures of 85 to 800°K and in some cases in the presence of a 15-kOe external magnetic field. The values of the hyperfine magnet... View full abstract»

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  • Magnetism of rare earth alloys

    Publication Year: 1970, Page(s):153 - 157
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The main properties of the rare earth elements are discussed, emphasizing their magnetic properties. However, it is difficult to use these elements in practice, because their Curie points are located below room temperature. In order to take advantage of the properties of these substances, they can be alloyed with iron, cobalt, or nickel. The properties of the rare earth-cobalt alloys are discussed... View full abstract»

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  • On the state and distribution of iron in the alnico 8 alloy

    Publication Year: 1970, Page(s):161 - 163
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Mössbauer measurements have been carried out on Alnico 8 alloy after various heat treatments. The spectrum measured at room temperature (RT) of the sample heat treated for optimum permanent-magnet characteristics shows the presence of Fe in paramagnetic environment, with an average quadrupolar splitting Δ = 0.16 mm/s probably due to tetragonal distortion of the matrix. For the sample que... View full abstract»

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  • Alternating and rotational hysteresis losses of γ-Fe2O3powders in a nonmagnetic matrix

    Publication Year: 1970, Page(s):164 - 166
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    Some aspects of the alternating and rotational hysteresis losses of very diluted samples of γ-Fe2O3particles are examined. The packing fractionpof the particles ranges from 0.001 to 0.120. The coercive force is found to be independent ofp. The alternating and rotational hysteresis losses appear dependent uponpforp < 0.04; th... View full abstract»

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  • On the origin of oblique-incidence anisotropy in evaporated cobalt films

    Publication Year: 1970, Page(s):167 - 169
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The main results obtained when studying a temperature dependence of the uniaxial anisotropy of oblique-incidence magnetic films of cobalt are given. It has been stated that when depositing the films onto a substratum heated to 350°C, the easy magnetization axis (EA) is perpendicular to the incidence plane of a molecular beam (a positive anisotropy). EA is in the incidence plane (a negative an... View full abstract»

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  • Rotational hysteresis in ticonal alloy

    Publication Year: 1970, Page(s):169 - 172
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Anisotropy constants and rotational hysteresis have been investigated at different stages of optimal heat treatment on 8-mm-diameter spherical samples. The changes in the uniaxial anisotropy constant obtained upon tempering are in good agreement with the respective changes in coercive force. Rotational hysteresis has been measured in the range from 400 to 28 800 Oe. Two maxima have been obtained o... View full abstract»

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  • Magnetization and remagnetization of anisotrophic magnetically hard ferrites

    Publication Year: 1970, Page(s):172 - 177
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    Magnetization curves and hysteresis loops of anisotropic hard ferrites were analyzed after the specimens had been demagnetized either thermally or by an ac field parallel or perpendicular to the preferred axis (PA) between -196°C and Curie temperature, or by a dc field. Each demagnetization yields a specific magnetization curve; below saturation fields, asymmetrically positioned and noncentro... View full abstract»

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  • The influence of magnetic reversal on the magnetic stiffness of polycrystalline barium ferrite

    Publication Year: 1970, Page(s):177 - 179
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The magnetic stiffness of polycrystalline isotropic barium ferrite has been measured in the region of negative field strength. It is found that the Stoner-Wohlfarth model describes magnetic reversal only for small field strength. Irreversible magnetization processes known from magnetization measurements have strong influence on the field dependence of the magnetic stiffness. The domain splitting o... View full abstract»

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  • Coercivity and wall motion

    Publication Year: 1970, Page(s):179 - 181
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The process of magnetization reversal in ferromagnets with uniaxial crystal anisotropy is discussed. It is shown that the "critical-size concept" has no relevance to coercivity. Critical fields are distinguished as nucleation fields and propagation, or pinning, fields. The pinning of walls is discussed and illustrated by experiments on various substances. Intrinsic pinning in highly anisotropic ma... View full abstract»

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  • The recent development of permanent magnet materials containing rare earth metals

    Publication Year: 1970, Page(s):182 - 190
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1086 KB)

    The prospect that permanent magnets with previously unattainable coercivities and energy products might be made from cobalt-rare earth alloys has caused intense research efforts in the last three years. Alternative ways of preparing magnets from powders and by casting were demonstrated in several laboratories.(BH)_{max} approx 20MG.Oe andMH_{c} > 25 000Oe have b... View full abstract»

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  • The structure of Ni-Co-Al-Ti-Cu-Fe permanent magnets

    Publication Year: 1970, Page(s):191 - 194
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (789 KB)

    A technique has been developed for extracting one of the phases present in Ni-Co-Al-Ti-Cu-Fe permanent magnet alloys heat-treated to give optimum magnetic properties. Examination of such extracts by electron microscopy and electron-probe microanalysis has confirmed previously held theories that the precipitate is strongly magnetic (50 percent Fe and 50 percent Co) in a virtually nonmagnetic matrix... View full abstract»

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  • Magnetic properties of alnico 5 and alnico 8 phases at the sequential stages of heat treatment in a field

    Publication Year: 1970, Page(s):194 - 198
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The results of an investigation of the magnetic properties of the α' and α phases in Alnico 8 and Alnico 5 alloys are presented. The influence on the alloy magnetic characteristics of changing these properties during the process of heat treatment is discussed. View full abstract»

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  • Experiments on RCO5and related compounds with permanent magnet properties

    Publication Year: 1970, Page(s):198 - 201
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    This paper investigates the possibility of replacing the expensive rare-earth metals by the relatively inexpensive cerium mischmetal in rare-earth-cobalt permanent magnets. Using mischmetal, it is possible to obtain powders with coercivities as high as when pure cerium or lanthanum are used, although it is not possible to equal the values obtained with samarium. A compact with a density of 5.3 g.c... View full abstract»

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  • On some peculiarities of the curves sigma versus temperature on alni and alnico alloys

    Publication Year: 1970, Page(s):205 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB)

    The curves σ =f(T)are taken at a very high heating rate (1000°C/min) on samples of Alni, Alnico 5, and Alnico 8 alloys, heat treated so that their equilibrium state should correspond to a temperature of about 600°C and the α' phase particles should be much bigger than after a usual heat treatment. The Curie point occurs respectively at 760, 905, and 920°C. As we... View full abstract»

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  • The effect of cobalt, sulfur, and tellurium on the liquidus-solidus gaps of Fe-Ni-Al-Co-Ti alloys

    Publication Year: 1970, Page(s):201 - 204
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The values of liquidus and solidus temperatures were measured for various permanent magnet alloys including Alcomax III and Hycomax II, III, and IV. The effect of sulfur on these temperatures was studied for each of the alloys, and the effect of tellurium on the temperatures for Hycomax IV was also studied. The effect of liquidus-solidus gaps on columnar crystal formation is discussed. An attempt ... View full abstract»

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  • The temperature dependence of the domain structure of uniaxial single crystals with high-anisotropy field

    Publication Year: 1970, Page(s):207 - 210
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (575 KB)

    The temperature dependence of the domain structure of single crystals of uniaxial ferrimagnetic oxides with high-anisotropy field in the SrO(6 - x)Fe2O3xAl2O3compositional series, withx = 1.8and 2.4, was investigated. The domain configurations of thermally and/or ac field demagnetized states and the changes in dc and ac f... View full abstract»

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  • Structural changes in alnico alloys

    Publication Year: 1970, Page(s):211 - 214
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The solid solution decomposition of Alnico 5 and Alnico 8 is studied by means of electron microscopy and X-rays. The following sequence of the decomposition process is found: Alnico 5: spherical zones-periodic modulated structure-rod-shaped particles of metastable tetragonal phases-final cubic phases; Alnico 8: the same sequence, but due to great importance of elastic energy at the decomposition, ... View full abstract»

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  • X-ray and Mössbauer study of alnico 8

    Publication Year: 1970, Page(s):215 - 217
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Mössbauer spectroscopy and X-ray studies have been used to investigate two Alnico 8 alloys in different stages of a thermomagnetic treatment cycle. It is revealed that the first low-temperature aging subsequent to magnetic field hardening results in redistribution of components among the alloy phases, while the second low-temperature aging causes the variation in the degree of weak magnetic p... View full abstract»

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  • Physical metallurgy and magnetic measurements of SmCo5-SmCu5alloys

    Publication Year: 1970, Page(s):221 - 224
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (839 KB)

    The magnetic properties of the hexagonal intermetallic compounds involving the rare-earth and3dtransition metals have been reported in the literature. These alloys look promising as fine-particle permanent magnets. A large number of samples in the system SmCo5-xCuxwere prepared by induction melting under a protective atmosphere, and annealed at various temperatures... View full abstract»

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  • Some relationships between crystal textures and magnetic properties of alnico 8

    Publication Year: 1970, Page(s):218 - 220
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Some relationships between crystal textures and their permanent magnet properties are reviewed on the basis of a homogeneous uniaxial anisotropic ferromagnet and a mosaic grain agglomerate in the commercial size of an Alnico 8 alloy. From the results obtained, it has been concluded that the highest energy might be obtained by control of the following two factors (besides the ordinary ones of compo... View full abstract»

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  • Investigations of high-coercivity alnico alloys

    Publication Year: 1970, Page(s):225 - 230
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (881 KB)

    For Alnico alloys containing 32-42 percent Co, 0-9 percent Ti, 6-8 percent Al, 14 percent Ni, 3 percent Cu, 0-0.5 percent S, 0-2 percent Nb, remainder Fe, the liquidus and solidus temperatures and the upper limit of the (α + γ) phase field were determined. The greatest influence is exerted by titanium in that all temperatures decrease as the Ti content increases. The influence of cobalt ... View full abstract»

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  • Relations between structure and properties in magnetically hard Fe-Co-V alloys: Deficiencies of equilibrium diagrams

    Publication Year: 1970, Page(s):230 - 232
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

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  • Crystal structure and morphology of the alloys for cast permanent magnets

    Publication Year: 1970, Page(s):237 - 239
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB)

    The structure of the Ticonal-type alloys was investigated using a transmission electron microscope technique. Two-dimensional square macrolattice was observed in the section normal to the magnetic field which was applied at heat treatment. The translation vectors of that lattice coincide with thelangle100rangledirections of the crystal lattice. There were equiaxed regions of various con... 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.

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Meet Our Editors

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