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Magnetics, IEEE Transactions on

Issue 4 • Date December 1971

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1971 , Page(s): 0
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  • Storage hierarchies: Gaps, cliffs, and trends

    Publication Year: 1971 , Page(s): 810 - 814
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (648 KB)  

    Trends in storage from 1952 to 1972 are presented. They include an increasing diversity of storage types, an increase in on-line storage capacity that exceeds the three-orders-of-magnitude increase in computer power, and an increased management of the storage complex by the system. The impact on past and present system design of the access gap between main memory and electro-mechanical storage is ... View full abstract»

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  • Virtual memory: A combined hardware-software memory system

    Publication Year: 1971 , Page(s): 819
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (105 KB)  

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  • Evaluation of multilevel memories

    Publication Year: 1971 , Page(s): 814 - 819
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    Proposed memory hierarchy technologies and configurations are usually evaluated by repeated running of "typical" jobs through simulated hierarchies while various parameters are adjusted. Simulation is too slow to be a tool for selecting among the choices in 1) technologies to be included, 2) implementation of each technology, and 3) management of data flow in the hierarchy. Four current hardware-m... View full abstract»

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  • The use of hierarchical storage in language-based multiprocessing systems

    Publication Year: 1971 , Page(s): 819
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (105 KB)  

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  • Data base management systems: The influence of hardware

    Publication Year: 1971 , Page(s): 820 - 823
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (536 KB)  

    The technology of software of data base management systems is described, and the influence that hardware has had on such systems in the past is discussed. In addition, an attempt is made to highlight some hardware advances that are awaited eagerly by software designers. View full abstract»

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  • The storage complex considered as a system component

    Publication Year: 1971 , Page(s): 824 - 829
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (872 KB)  

    To permit further growth in the application of information systems, the lower level activities must be automated so that they cease to be a burden on the user. A synthesis of known hardware devices and software algorithms for dynamic storage allocation is advocated which can achieve acceptable efficiency at run time by using the explicitly defined data structure as a basis for store management and... View full abstract»

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  • Bulk storage requirements in large-scale scientific calculations

    Publication Year: 1971 , Page(s): 830 - 833
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    The experience and plans of three scientific computing installations with bulk storage are reviewed with respect to capacity requirements, reliability enhancement, and the avoidance of recording delays. The bulk storage requirements of experimental data bases, array storage for large-scale scientific calculations, and large output files are reviewed. Results are presented of a survey of tape libra... View full abstract»

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  • Bulk storage requirements at the social security administration

    Publication Year: 1971 , Page(s): 833 - 834
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (256 KB)  

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  • Information retrieval: United air lines operations system

    Publication Year: 1971 , Page(s): 835 - 838
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (528 KB)  

    The development of United Air Lines operational computer system is described. This is a medium-volume general-purpose on-line system with off-line capability, the need for such a system arose from the decentralized nature of airline operations coupled with the increasing need to automate many areas of company operations in addition to the traditional reservations and accounting functions. The comp... View full abstract»

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  • Bulk storage applications in the illiac IV system

    Publication Year: 1971 , Page(s): 838 - 842
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (544 KB)  

    In the next year several fourth generation machines with performance in the 100 million instructions per second range will become available. The Illiac IV is one of these machines. With the advent of these machines it will become practical to include an extra dimension, or to greatly increase the resolution of many mesh calculations. Problems which are currently constrained to two spatial dimensio... View full abstract»

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  • National archives mass storage requirements--1975 to 1980

    Publication Year: 1971 , Page(s): 843 - 847
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (704 KB)  

    The Federal Government is the largest buyer of magnetic tape in the world. Current procurement is approximately one million reels annually. Of these tapes, slightly ever 1 percent are destined to contain data of permanent value. The problems the National Archives and Records Service (NARS) is encountering in preserving machine-readable records for long periods of time, particularly periods in exce... View full abstract»

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  • Mass storage utility: Considerations for shared storage applications

    Publication Year: 1971 , Page(s): 848 - 852
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (568 KB)  

    Desirable characteristics for future massive storage systems in the 1012- to 1015-bit range are projected for systems operating in a shared storage environment. Characteristics for capacity, cost, access, and reliability, as deemed important to the user of such systems are listed. Emphasis is placed on the operation of large capacity storages as central data banks serving a n... View full abstract»

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  • Annealing effects in plated-wire memory elements, part I: Interdiffusion of copper and permalloy

    Publication Year: 1971 , Page(s): 852 - 858
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1032 KB)  

    Results of investigations using X-ray diffraction and electron-beam microprobe techniques have shown that copper and Permalloy platings interdiffuse at low temperatures (in the range 180-230°C) when plated-wire memory elements are annealed for times as short as 50 h. Measurable interdiffusion between Permalloy platings and gold substrates does not occur in similar conditions. Both magnetic an... View full abstract»

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  • Annealing effects in plated-wire memory elements, part II: Recrystallization in permalloy films

    Publication Year: 1971 , Page(s): 858 - 860
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (368 KB)  

    Results of grain-size measurements in Permalloy platings suggest that recrystallization is possible at temperatures as low as 200°C, but that it is an extremely heterogeneous process. No worthwhile correlation was found to exist between observed grain size and magnetic dispersion in samples aged in the temperature range 180 and 230°C, and it is suggested that the magnetic aging which occ... View full abstract»

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  • Magnetic stress anisotropy field in plated cylindrical permalloy films

    Publication Year: 1971 , Page(s): 861 - 867
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (760 KB)  

    An analysis is made of the magnetic stress anisotropy field Hks, arising from internal and external stress sources in plated-wire memory elements. The analysis takes into consideration circumferential composition variation and cylindrical geometry of the Permalloy film. Expressions are derived relating Hksto uniaxial film stress, average composition, and amplitude of composit... View full abstract»

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  • A high-density coupled-magnetic-film memory array

    Publication Year: 1971 , Page(s): 868 - 872
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (648 KB)  

    A high-density coupled-hard-axis (CHA) destructive readout (DRO) magnetic-film device which yields storage density ≥ 6400 cells per square inch and drive currents compatible with ICs is described. A thin word line design is unique in that its own resistance is used as its termination. This thin word line design permits word line grouping on the substrate level resulting in larger spaced fan-... View full abstract»

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  • Self-consistently computed magnetization patterns in thin magnetic recording media

    Publication Year: 1971 , Page(s): 873 - 880
    Cited by:  Papers (57)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (976 KB)  

    A model involving head motion is given for self-consistently computing magnetic recording medium magnetization patterns. The reduction in demagnetizing field due to the presence of the high-permeability head structure is included, as is record head removal, read head replacement, and computation of the readback voltage. The model is capable of handling an arbitrary record current waveform. Optimum... View full abstract»

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  • The WRITE process in magnetic recording

    Publication Year: 1971 , Page(s): 880 - 885
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (768 KB)  

    An extension of an earlier model of the WRITE process in saturation recording that accounts for internal fields due to magnetization divergence in the recording medium is presented. It is shown that the initial condition of the medium determines the internal field distribution during WRITE and may lead to appreciable peak shift and WRITE over modulation. The special case of two successive reversal... View full abstract»

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  • Thermomagnetic writing in homogeneous MnBi films

    Publication Year: 1971 , Page(s): 885 - 890
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (808 KB)  

    The specific Faraday rotation of the homogeneous low-temperature phase (LTP) and quenched high-temperature phase (HTP) MnBi films used for the writing experiments was measured to be 9.5\times10^{5} degrees per centimeter and 4.3\times10^{5} degrees per centimeter, respectively, at 25°C and a light wavelength of 632.... View full abstract»

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  • An unsymmetrical mode of ferroresonance

    Publication Year: 1971 , Page(s): 890 - 895
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    Earlier studies of ferroresonance note the existence of unsymmetrical modes of operation of series circuits with square-loop reactors. Here the observation of stable second harmonics in a series ferroresonant circuit with a reactor having very nonsquare-loop core material is noted; these harmonics produce unsymmetrical circuit waveforms. Circuit behavior is described, and a qualitative explanation... View full abstract»

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  • Magnetization, anomalous barkhausen effect, and core loss of supermendur under high temperature cycling

    Publication Year: 1971 , Page(s): 896 - 899
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    The magnetization and core loss of Supermendur were measured up to 900°C under conditions of slow temperature cycling in vacuum. As a consequence of this heating the coercivity at 25°C increased from 21 A/m to about 110 A/m. This increase is less than previously reported. A prominent anomalous Barkhausen effect, pinched-in hysteresis loops, and a magnetic viscosity field in excess of 20 ... View full abstract»

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  • Measurement of flux distribution in toroidal and multiaperture cores

    Publication Year: 1971 , Page(s): 899 - 905
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (768 KB)  

    Recently, magnetic devices utilizing a partial switching have been used in many fields. From a point of core design, a flux distribution must be known. It is possible to calculate them under some assumptions, but it is difficult to measure them experimentally. This paper describes a technique of determining a flux distribution in toroidal and multiaperture ferrite cores. The patterns of flux distr... View full abstract»

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  • Influence of construction data on the dynamics of dry-reed relays

    Publication Year: 1971 , Page(s): 905 - 909
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (376 KB)  

    Analysis and the results of calculations connected with the closing process and bounces of dry reeds are presented. Dynamic properties of dry-reed relay are described by means of several dimensionless parameters. The calculation results of dynamic properties of dry-reed relays are presented in appropriate characteristics. The case of quasi-optimal control is also discussed. View full abstract»

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  • Long-term stability of a ferrite core flux-gate magnetometer in high field

    Publication Year: 1971 , Page(s): 909 - 910
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB)  

    A 9-month comparison between a single component flux gate and a proton magnetometer has been made. The fluxgate sensor was oriented parallel to the total field so that the output was directly comparable to a proton mangnetometer reading. During the period the total drift of the flux-gate magnetometer baseline was +35γ. 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