Knowledge of the glass-substrate temperature and its control is often very important in the vacuum deposition of nickel-iron thin films. Discrepancies in vacuum-component-temperature measurements and control prompted a study on the subject. A theoretical investigation showed that a large-area low-temperature radiation source would be most desirable for glass-substrate heating. Experimentation with various heating techniques resulted in two acceptable methods. A temperature variation of less than two degrees at 250 °C was achieved over a large volume.
An observation technique utilizing the longitudinal Kerr magneto-optic effect was used in various studies of thin film recording. The semitransparent nature of the recording media allowed simultaneous observation of recorded domains and the write and read head gaps. Thin film heads were used to record in iron films having coercivities ranging from 60 to 160 Oe. The apparatus allowed quick determinations of maximum linear densities which were as high as 1550 flux reversals/cm. Recorded domain orientation with respect to the gap of a thin film read head was easily observed, and the corresponding output signals on an oscilloscope were photographed. The write-read-observe apparatus with a thin film read head was also helpful in detecting the magnetic field from Néel walls.
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