IEEE Transactions on Magnetics

Issue 5 • September 1980

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Displaying Results 1 - 25 of 219
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • General chairman's message

    Publication Year: 1980, Page(s):602 - 603
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    Freely Available from IEEE
  • The simultaneous multiple dipping of magnetic bubble garnets

    Publication Year: 1980, Page(s):604 - 609
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The simultaneous growth of LPE films on two-inch diameter Gd3Ga5O12substrates with nominal film compositions in the (YLuSmCa)3(FeGe)5O12system is studied. The effective distribution coefficients of Ca2+-Ge4+, Y3+, Lu3+and Sm3+are discussed and related to the magnetic property va... View full abstract»

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  • Submicron bubble garnets and their characterizations

    Publication Year: 1980, Page(s):610 - 615
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    New Submicron (0.5-1.0 mum diam) bubble garnets have been developed. In order to reduce saturation induction4piMsas low as possible, suitable choice of amounts of nonmagnetic ions substituting for ferric ions in both tetrahedral and octahedral sites were studied in (YSm)3(FeAl)5O12, (YSmLu)3- (FeGaSc)5O12, (YSm... View full abstract»

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  • Small bubble garnet films with collapse-field temperature coefficients ranging from -0.3 to about 0%/°C

    Publication Year: 1980, Page(s):616 - 618
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (295 KB)

    It is confirmed that collapse-field temperature coefficientsDeltaH_{o}(T)of conventional YSmLuCaGeIG (SL) films varied in the range of -0.1 ∼ -0.3 %/°C in proportion to the molar ratio of Lu2O3/Sm2O3in the melt composition.DeltaH_{o}(T)of the SL system was found to be limited in the range of -0.21 ∼ -0.3 %/°C w... View full abstract»

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  • Bubble states and other magnetic properties of the (LaSmLu)(GaFe) and (LaSmTm)(GaFe) garnet films

    Publication Year: 1980, Page(s):619 - 621
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (337 KB)

    For the epitaxial films of the (LaSmLu) (GaFe) and the (LaSmTm)(GaFe) garnets, bubble rocking experiments have been performed on as grown films i.e. films without an ion implanted or a specifically grown capping or booting layer. Based on these results, the films studied can be classified into three groups: (1) Films in which only a single bubble state, the S=1, was observed. (2) Films in which at... View full abstract»

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  • Static characterization of magnetic bubble films

    Publication Year: 1980, Page(s):622 - 624
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A.C. susceptibility and optical interference are combined to determine the material length, saturation magnetization and thickness of garnet bubble films on GGG substrates. These measurements have been automated to provide precisions of better than 1% and throughputs of more than sixty wafers per hour. Derived values of material length and saturation magnetization agree to better than ±3% wit... View full abstract»

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  • New method for routine measurement of coercivity in magnetic bubble films

    Publication Year: 1980, Page(s):625 - 627
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    We describe a new technique for measuring coercivity in magnetic bubble films which consists of placing the film in a weak field gradient (∼1 Oe./μm) in order to obtain a set of finger-like domains. The unconstrained ends of these domains are caused to move back and forth in response to an oscillatory field, and the coercivity is obtained from an extrapolation of the linear portion of t... View full abstract»

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  • Noncontact transverse scan rotating head recording device

    Publication Year: 1980, Page(s):628 - 630
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A new transverse scan rotating head recording device was investigated which is capable of high speed tracking and noncontact recording. Small tracking time less than 1 ms was obtained in a reel-to-reel tape transport by the circuit technology improving the effective resolution of a reel motor tachometer. Noncontact recording capable of more than 107head scans without tape wear was achie... View full abstract»

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  • Optical methods of the head positioning in magnetic disk systems

    Publication Year: 1980, Page(s):631 - 633
    Cited by:  Papers (3)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    This paper reports a new method of head positioning by applying optics to magnetic disk systems. To increase the accuracy of head positioning, several methods in which a servo disk is not used have been investigated. Until now these methods were unsuccessful because of interference between the head positioning signal and the data signal, both of which were recorded on the same data surface. In the... View full abstract»

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  • A statistical model for determining the error rate of the recording channel

    Publication Year: 1980, Page(s):634 - 636
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A statistical model of the recording channel using a Monte Carlo computer simulation program has been developed. All the sources which contribute to the error rate can be simultaneously examined. System error rates and error rate trends due to parameter variations, sensitivities, and trade-offs can be studied with a good degree of confidence. Several examples of studies utilized in the development... View full abstract»

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  • Selection of modulation code parameters for maximum lineal density

    Publication Year: 1980, Page(s):637 - 639
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The relative performance capabilities for many known run-length-limited binary modulation codes useful in digital magnetic recording are placed in perspective. The criteria for grading is relative maximum achievable lineal recording density under conditions of quasi-optimal spectral shaping. The results are based upon a linear system analysis in which superposition is applicable in modeling satura... View full abstract»

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  • Processing of signals from media with perpendicular magnetic anisotropy

    Publication Year: 1980, Page(s):640 - 642
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The readback signals from a ring (Karlqvist) head and recording medium with perpendicular magnetic anisotropy are analyzed using signal processing criteria. The self-consistent model developed by Beardsley and Potter is used to study the feasibility of detecting transitions at high densities. Simulated readback signals are discussed in terms of time and frequency domain characteristics. A simplifi... View full abstract»

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  • Magnetoresistive response of small permalloy features

    Publication Year: 1980, Page(s):643 - 645
    Cited by:  Papers (36)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    We have systematically studied the character and variations of Barkhausen noise in a variety of micron size magnetoresistive sensors. From domain observations, we have revealed the basic micromagnetic process involved and demonstrated the central role played by Neel wall structures and their instabilities in Barkhausen noise. A small amount of easy axis field is effective in producing rotational r... View full abstract»

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  • Superparamagnetic properties of thin films and small particles of magnesium ferrite

    Publication Year: 1980, Page(s):649 - 651
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (329 KB)

    The magnetic properties of superparamagnetic thin films and small particles of magnesium ferrite obtained by thermal treatment of the iron films evaporated in vacuum on the View full abstract»

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  • Facing targets type of sputtering method for deposition of magnetic metal films at low temperature and high rate

    Publication Year: 1980, Page(s):646 - 648
    Cited by:  Papers (153)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A new type of cathode sputtering apparatus with two targets facing each other has been developed to prepare magnetic films at a high deposition rate without the extreme rise of the substrate temperature. When two disks of iron and nickel were used as targets, the maximum deposition rates obtained were approximately 4000 and 5000 Å/min, respectively. The substrate temperature was not elevated ... View full abstract»

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  • Rotatable magnetic anisotropy in epitaxial ferrite layers

    Publication Year: 1980, Page(s):652 - 653
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Magnetic domain structure and magnetic anisotropy were studied in monocrystalline epilayers of Mg0.9Mn0.3Fe1.8O4ferrite. The layers, several micrometers thick, were obtained by a CVD method on monocrystalline MgO substrates. Domain observations were performed by the Bitter's method. Magnetic anisotropy measurements were performed by torque and FMR method... View full abstract»

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  • A new magnetic alloy of high constant permeability

    Publication Year: 1980, Page(s):654 - 656
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Several conventional alloys of constant permeability used previously were of lower values of permeability, or they would change obviously in different intensities of magnetic field and thus could not satisfy some specific requirements of electrical application. The alloys consisted of Ni 60-70 wt%, Fe 29-39wt% and Mn 0-1 wt% were investigated. The best of those alloys for certain use is 1J66 alloy... View full abstract»

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  • Spectrum and lineshape of bubble-lattice resonance

    Publication Year: 1980, Page(s):657 - 659
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Spectral analysis of photometrically detected bubble-lattice oscillations reveal resonance frequencies of 45 and 66 MHz in a 6.2μm film of (Gd,Y)3(Fe,Ga)5O12. Similar results are obtained for stripe lattices. Existing theory explains the dependence of the lower-frequency resonance on bias field and lattice parameter. To explain the higher resonance, a theory o... View full abstract»

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  • Microwave transmission through ferromagnetic metals

    Publication Year: 1980, Page(s):660 - 665
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Transmission of microwave radiation through a metal ferromagnet is enhanced at the field corresponding to ferromagnetic antiresonance. This phenomenon can be used to measure the magnetic parameters of a specimen. It is a particularly useful and sensitive tool for studying the damping processes in metals. This technique is compared with that of ferromagnetic resonance absorption (FMR). It is pointe... View full abstract»

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  • Resonant transmission of electromagnetic energy through thick ferromagnetic films via phonons

    Publication Year: 1980, Page(s):666 - 668
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The transmission lineshape is calculated for the case when exchange shift of the field, at which sound attenuation is a maximum, is comparable to the half-width of the ferromagnetic resonance. It is assumed that the d.c. magnetic field is perpendicular to the film and is directed along the axis [001] ; the r.f. magnetic field is applied in the plane of the film. A brief description of the main res... View full abstract»

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  • Broadened low-field modes in thick yttrium iron garnet epilayers

    Publication Year: 1980, Page(s):669 - 671
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Damped surface modes in thick YIG epilayers which appear at fields below the Damon-Eshbach limit in microwave spectra with the dc magnetic field parallel to the surface, have been investigated. The introduction of a surface anisotropy term in the boundary conditions of the propagation equations qualitatively accounts for these low-field modes. View full abstract»

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  • A study of narrow linewidth Li-ferrite

    Publication Year: 1980, Page(s):672 - 674
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB)

    Using conventional ceramic procedure and cheap raw materials, we have succeeded in preparing narrow linewidth polycrystalline Li-ferrites with the chemical formula: Li0.5(1-x+y)ZnxTiyFe2.5-0.5(x+3y)-zMnzO4in the region of0.15 < x leq 0.30,0.85 < y < 1.10,0.03 leq z leq 0.05and observed the growth condition of the... View full abstract»

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  • Measurement of magnetic losses in resonant metallised ferrites

    Publication Year: 1980, Page(s):675 - 677
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Microwave magnetic losses, far enough from the ferromagnetic resonance, are generally measured by perturbation methods, i.e. by comparing resonance of a cavity with and without magnetic sample. Nevertheless such methods require very accurate apparatuses, for parameters of the resonant cavity are slightly altered by the presence of the sample because of the relative smallness of the latter. The for... View full abstract»

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  • Crystal defects and characteristics of YGaIG single crystal grown by the float zone method

    Publication Year: 1980, Page(s):678 - 680
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    It was revealed that the YGaIG single crystal grown by the FZ method shows an etch pit pattern caused by crystal defects different from that obtained by flux method. To reduce such crystal defects, various experiments as parameters of crystallizing conditions have been studied. These experimental results revealed that crystal defects of etch pit density of less thatn 102pcs.cm-2 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