Scheduled System Maintenance:
Some services will be unavailable Sunday, March 29th through Monday, March 30th. We apologize for the inconvenience.
By Topic

Magnetics, IEEE Transactions on

Issue 1 • Date January 1983

Filter Results

Displaying Results 1 - 12 of 12
  • [Front cover and table of contents]

    Publication Year: 1983 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (310 KB)  
    Freely Available from IEEE
  • New single-mask approach to bubble device fabrication

    Publication Year: 1983 , Page(s): 2 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (848 KB)  

    Permalloy devices with two separate levels of fine permalloy and conductor patterns have been fabricated by the use of a single-mask process. This process makes possible the production of devices having an essentially conventional design in addition to a completely planar structure. The features of this new process include 1) preparation of a reticle on which patterns for both permalloy and conductor layers are superimposed, 2) use of SiO2, Mo/Au/Mo, SiO2, permalloy, and TiO2thin films deposited sequentially on the bubble materials, and 3) simultaneous delineation of both photoresist patterns with two different thicknesses and of the desired patterns by CF4plasma etching and ion-milling. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Signal-to-noise ratio studies on γ-Fe2O3thin film recording disks

    Publication Year: 1983 , Page(s): 7 - 12
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    The signal-to-noise ratio SNRwof γ-Fe2O3thin film disks has been investigated in a linear bit density range of 77-1500 flux reversals per millimeter (FRPM), for several media whose average crystallite sizes were changed by Ti doping. The noise voltage was found to increase as the bit-cell length became shorter, and as the average crystallite size became larger. A SNRwrelationship to the average crystallite size, the resolution, and the bit-cell length was empirically determined as a simple formula. For a 10-μm core width and for a 1.0-μm bit-cell length, an SNRwof more than 35 dB was estimated to be attainable from the medium which had a 0.90 resolution and had crystallites averaging less than 0.06 μm in size. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pressure-induced signal loss in Fe3O4and γ-Fe2O3thin film disks

    Publication Year: 1983 , Page(s): 12 - 19
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (912 KB)  

    Pressure-induced signal loss in Fe3O4and γ-Fe2O3thin film disks has been investigated. Through gauzes, pressure of 20 to 500 g/cm2were applied to the surface of a disk rotating 300 revolutions per minute (rpm). The result was extremely large signal losses of 40 to 90 percent. Several types of losses characteristic of ferrite surfaces were observed: initial loss, subsequent loss, and steady loss. These phenomena were consistently explained by a model that shows that the removal of a small amount of unstable surface crystallites by pressure reduces the leakage flux density. Wiping the rotating disk surface with gauze at a pressure of about 1000 g/cm2was effective in reducing the loss. It was confirmed that Ti doped γ-Fe2O3thin films prepared from α-Fe2O3show better resistance to pressure than do Fe3O4and other γ-Fe2O3films. Surface lubrication of the medium was also confirmed to be effective in reducing the loss. Contact-start-stop (CSS) induced signal loss and the possibility of pressure-induced missing signal errors due to thin film pinholes were also examined for typical γ-Fe2O3thin film disks. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • AC magnetostriction in Si-Fe single crystals close to

    Publication Year: 1983 , Page(s): 20 - 27
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1008 KB)  

    The relation between the ac magnetostriction and magnetization processes as to Si-Fe single crystals close to the View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characterization of magnetohydrostatic axial separation system

    Publication Year: 1983 , Page(s): 27 - 32
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    The use of the magnetohydrostatic axial separation system for separation and characterization of particulates is considered. It is shown that one reference curve determined with a given paramagnetic fluid at a given current level is sufficient for the calculation and construction of a set of calibration curves for different fluids and current levels. In cases where a solution of the magnetic field is available, calculation of reference curves are straightforward. In other cases they must be determined experimentally. Procedures for calculations of the density and susceptibility of particles by use of the calibration curves are outlined, and expected axial separation patterns of a mixture of particles are evaluated. It is shown that lower resolution is associated with high levitational forces. Increase of resolution may be obtained at higher current levels or by smaller rate of tapering of the poles in the region of small air gap. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The deposition of material on millimeter-sized single spheres in the transverse configuration of HGMS

    Publication Year: 1983 , Page(s): 32 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    The deposition of particles on millimeter-sized single spheres in transverse high gradient magnetic separation (HGMS) is observed microscopically under different conditions of magnetic field and flow velocity. The results are related to a semiempirical model of the collection process as a function of total particle mass transfer through the system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Boundary integral equations analysis of induction devices with rotational symmetry

    Publication Year: 1983 , Page(s): 36 - 44
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    The application of boundary integral equations (BIE's) for the analysis of linear induction devices with rotational symmetry is considered. One-dimensional Fredholm integral equations are derived for the tangential field components at the boundary of a conducting medium with constant scalar conductivity and permeability excited by a time-harmonic azimuthal current source. The important special case of a short right circular conducting cylinder (magnetic or nonmagnetic) coaxial with one or more short coils is treated in detail. The explicit form of the kernels and the numerical solution technique are presented. Numerical results are presented for typical induction heating applications where the load length as well as the coil length are finite. Results are also presented for the magnetostatic problem of finding the demagnetization factors for short magnetic rods. In each case the results are compared with published results and the accuracy and efficiency of the proposed approach are demonstrated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Static interferometer characteristics with many equal Josephson junctions

    Publication Year: 1983 , Page(s): 44 - 50
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB)  

    Flux quantum states (FQS) of interferometers with up to ten equal Josephson point junctions are characterized in the phase and current plane. Their symmetry properties are derived. Simple formulas are given to design interferometers being equivalent to uniformly distributed Josephson junctions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Eddy currents in conducting magnetic recording media

    Publication Year: 1983 , Page(s): 51 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    Use of metallic magnetic recording media raises the possibility that medium eddy currents will influence the recording process. The mathematical analog to diffusion of heat allows exact solutions for cases approximating those of interest. Eddy current effects are shown to be negligible for usual thicknesses of longitudinal and perpendicular media. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Large-railgun residue material analyzed by X-ray photoelectron spectroscopy

    Publication Year: 1983 , Page(s): 53 - 54
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    Samples of a black powdery residue material which appeared on the rails of a large-scale railgun system were analyzed using X-ray photoelectron spectroscopy. No copper content could be detected in the residue materials associated with nominally sliding contact or arc-driven test shots. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1983 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (612 KB)  
    Freely Available from IEEE

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