Magnetic domain study of micron-and nano-sized permalloy structures induced by a local current

Master'sMASTER OF ENGINEERIN

Magnetic anisotropy in single crystal nickel films

Imperial Users onl

Solid state research of the Applied Physics Department for the year 1965

Solid state physics - semiconductor energy gap materials, crystal structure, epitaxial vacuum vaporization, magnetic behavior, and optical transmissio

Effect of circular voids on the domain configuration of NI80FE20 micro-structures

Master'sMASTER OF ENGINEERIN

The low frequency magnetic properties of nickel-iron films and their investigation by BH curve plotter techniques.

The present thesis deals with the low frequency or quasistatic properties of thin vacuum evaporated nickel—iron films, in particular with extending the range and accuracy with which these properties can be measured by audio-frequency BH plotter techniques. An integral part of this work has consequently been the design and construction of a suitable BH plotter, together with a critical examination of the theoretical and practical factors limiting the performance of an instrument of this type. Considered in detail are the optimum integration transfer functions for low noise, and the best geometrical shape of the sense coil for the maximum coupling with the film sample. Circuits are given for the transistorized, high accuracy, phase compensated preamplifier and feedback integrator used in the BH plotter. Theoretical and experimental results are given in the use of the BH plotter for the measurement of such quantities as anisotropy torque curves to 0.1 per cent accuracy, which have previously required more complex and delicate instruments. Easy axis hysteresis loops are examined and the switching processes, and consequently the coercive force, shown to be dependent on the time rate of change of the measuring field. The effects of anisotropy dispersion is considered throughout, and a rigorous analysis is given of the wavelength and amplitude of the resulting magnetizational ripple. The properties of thin films are critically dependent on the conditions during deposition. This thesis also describes a self—supporting electron bombardment source with instrumentation for the control of film thickness and the stabilization of the deposition rate

Investigation and development of new concepts for improvement of aircraft electrical power systems Quarterly progress report

Engineering and materials concepts for improved aircraft electrical power system

Gravity gradient stabilization system for the applications technology satellite Second quarterly progress report, 1 Oct. - 31 Dec. 1964

Systems analysis, boom subsystem, combination passive damper, and attitude sensor subsystem in gravity gradient stabilization system of applications technology satellit

Microfluidics and Nanofluidics Handbook

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