By Topic

IBM Journal of Research and Development

Issue 2 • Date April 1960

Filter Results

Displaying Results 1 - 21 of 21
  • Foreword

    Publication Year: 1960 , Page(s): 94 - 95
    Save to Project icon | PDF file iconPDF (318 KB)  
    Freely Available from IEEE
  • Domain Walls in Thin Ni-Fe Films

    Publication Year: 1960 , Page(s): 96 - 106
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1045 KB)  

    Observations of domain walls in Ni-Fe films as a function of thickness demonstrate the strong influence of magnetic stray fields on the wall structure, hence on the coercivity for wall motion. In order to reduce the stray-field energy, the Bloch walls in films thicker than 1000 A are subdivided into sections with alternating polarity which are separated by Bloch lines. In thinner films, the domain... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Measurement of Magnetic-Field Attenuation By Thin Superconducting Films

    Publication Year: 1960 , Page(s): 107 - 115
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (893 KB)  

    The dependence of the field attenuation on temperature and superimposed dc magnetic field is measured with a sensitive rf bridge. It is shown theoretically that the penetration depth λ can be derived from the attenuation measurements, and the experiment therefore yields λ as a function of temperature and dc magnetic field. Changes in λ can be detected to an accuracy of ±... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic Anisotropy in Single-Crystal Thin Films

    Publication Year: 1960 , Page(s): 116 - 129
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1874 KB)  

    Thin, single-crystal films of Ni, Fe, Ni-Fe and Ni-Co have been grown by vacuum deposition onto heated rock salt. The cubic crystalline anisotropy constant, K1, of these films has been measured at room temperature by a torque method. In the case of the Ni-Fe alloys, K1 was found to be the same for thin films as for bulk materials of the same composition. The measured anisotro... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the Residual Gases in Several Types of High-Vacuum Evaporators

    Publication Year: 1960 , Page(s): 130 - 142
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1106 KB)  

    A mass spectrometer study is made of the residual gases in several types of vacuum evaporators ranging from oil-diffusion-pumped, conventional systems to an oil-free, ultra-high-vacuum chamber. Partial pressures of water vapor, hydrogen, carbon monoxide, carbon dioxide, nitrogen, oxygen, argon and hydrocarbon vapors varied appreciably in the evaporators studied. The performance of a conventional s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrical Properties of Thin-Film Semiconductors

    Publication Year: 1960 , Page(s): 143 - 151
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (920 KB)  

    The theory of the electrical properties of metal films as given by Fuchs and Sondheimer is extended to nondegenerate semiconductors with ellipsoidal energy surfaces. A change of variables reduces the problem to a simpler one with spherical energy surfaces but with electric and magnetic fields which are tilted with respect to the film. This is solved to first order in the applied fields. The effect... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Anisotropic Conduction in Solids Near Surfaces

    Publication Year: 1960 , Page(s): 152 - 157
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (540 KB)  

    A reduction in the electrical conductivity of a solid results from “diffuse” reflection of electrons from the surfaces. The effect occurs for specular reflection also, if the operative electron-energy surfaces are not spherical. A theory of the latter case is given here. The average conductivity of a thin crystal tends to a finite limit (rather than zero) as the thickness tends to ze... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Size Effects for Conduction in Thin Bismuth Crystals

    Publication Year: 1960 , Page(s): 158 - 162
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (569 KB)  

    The size dependence of the electrical conductivity, and preliminary results for galvanomagnetic effects, in thin, single crystals of high-purity bismuth at 4.2°K are reported for a range of thicknesses comparable to the electron mean free path. The results, when interpreted according to the theory of Ham and Mattis and of Price (in the accompanying papers), show that the scattering of elect... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Angle-of-Incidence Anisotropy in Evaporated Nickel-Iron Films

    Publication Year: 1960 , Page(s): 163 - 172
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (985 KB)  

    The magnetic anisotropies of iron, nickel, and permalloy films, evaporated onto glass substrates at various incident angles and substrate temperatures, have been measured by a torque method. For all compositions, the largest absolute value for the magnetic anisotropy occurs at the largest incident angle and lowest substrate temperature. A detailed calculation of the anisotropy resulting from a [11... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Superconducting Tin Films of Low Residual Resistivity

    Publication Year: 1960 , Page(s): 173 - 183
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1109 KB)  

    Evaporated tin films of low residual resistivity have been produced by using very high deposition rates in a conventional vacuum system. The substrates were cooled with liquid nitrogen. After the film edges are removed by mechanical trimming or chemical etching, these films show sharp magnetic and temperature transitions from the superconducting to the normal state, a critical field - temperature ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Influence of Aggregation on the Magnetic Phase Transition of Evaporated Superconducting Thin Films

    Publication Year: 1960 , Page(s): 184 - 188
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (577 KB)  

    An investigation was made of the magnetic phase transition of thin, superconducting Sn films. In evaporated films, because of the sloping edges, broad magnetic field transitions are generally found. This paper shows that such “penumbra” effects can be eliminated by raising the temperature of the substrate during evaporation. The lack of penumbra effect was due to the aggregation of t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nanosecond Switching in Thin Magnetic Films

    Publication Year: 1960 , Page(s): 189 - 196
    Cited by:  Papers (14)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (737 KB)  

    A special pulse equipment including a pulse-sampling oscilloscope with an over-all response time of 0.35 nanosecond (10−9 sec) for the observation of the nanosecond flux change in thin permalloy films is described. Film switching signals as short as 1 nanosecond have been obtained and are discussed with respect to the underlying processes. Inverse switching time versus driving-fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Variation of Cryotron Current Amplification Factor with Temperature [Letter to the Editor]

    Publication Year: 1960 , Page(s): 197
    Cited by:  Papers (1)
    Save to Project icon | PDF file iconPDF (237 KB)  
    Freely Available from IEEE
  • The Influence of Edge Effects on Domain Structure and Coercive Force of Circular Nickel-Iron Films [Letter to the Editor]

    Publication Year: 1960 , Page(s): 198 - 201
    Save to Project icon | PDF file iconPDF (497 KB)  
    Freely Available from IEEE
  • A New Electron Mirror Design [Letter to the Editor]

    Publication Year: 1960 , Page(s): 202 - 204
    Cited by:  Papers (1)
    Save to Project icon | PDF file iconPDF (403 KB)  
    Freely Available from IEEE
  • Measurement of Crystallite Size and Strain of Electroplated Films [Letter to the Editor]

    Publication Year: 1960 , Page(s): 205 - 207
    Save to Project icon | PDF file iconPDF (491 KB)  
    Freely Available from IEEE
  • Information-Theoretical Aspects of Inductive and Deductive Inference

    Publication Year: 1960 , Page(s): 208 - 231
    Cited by:  Papers (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2132 KB)  

    By a straightforward application of Bayes' theorem of probability, the behavior is discussed of the credibilities (inductive probabilities) of competing hypotheses as functions of an increasing body of relevant empirical data. It is shown how the effect of a priori credibilities persists in the evaluation of credibilities in general, except in the important limiting cases investigated. An “... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IBM Technical Papers Published in Other Journals

    Publication Year: 1960 , Page(s): 232 - 238
    Save to Project icon | PDF file iconPDF (934 KB)  
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1960 , Page(s): 239 - 240
    Save to Project icon | PDF file iconPDF (244 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1960 , Page(s): 241 - 243
    Save to Project icon | PDF file iconPDF (412 KB)  
    Freely Available from IEEE
  • Contents of Previous Four Issues

    Publication Year: 1960 , Page(s): 244
    Save to Project icon | PDF file iconPDF (240 KB)  
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center