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This article describes novel techniques for preparing magnetic films to give a fast (microsecond), noise-free, self-induced voltage output caused by a change in magnetic induction.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
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Magnetic Detector or Magnetic Memory Element
This article describes novel techniques for preparing magnetic films to give a
fast (microsecond), noise-free, self-induced voltage output caused by a change
in magnetic induction.
The film can be composed of a binary or ternary alloy such as Ni-Co, Ni-Fe,
Fe-Co or Ni-Fe-Co, adjusted to give optimum properties of coercive field,
permeability and magnetostriction.
Fig. 1 shows the shape of the film 12 which can be plated or evaporated on
a copper wire 10 or other conductor. Typically, film 12 could be 1 to 25 Mu thick
and the conducting wire 0.01 to 0.1 cm diameter. Film thickness is adjusted to
give maximum self-induced voltage with minimum demagnetization compatible
for the required application.
One method for preparing such a film, either by plating or evaporation,
incorporates a magnetic field designed to cause an easy magnetic axis in the
form of a spiral. As indicated in Fig. 2, during the plating or evaporation, an
electrical current i of a few amperes is passed through the wire from A to B. This
gives rise to a radial field H(R). Superimposed is an axial field H(A) parallel to
wire 10 caused by a suitably located coil or permanent magnet. The resulting
field is a spiral H(RA) which causes an easy magnetic axis of the same form in
A film 12, made under these conditions, can be made to switch its direction of
magnetization along H(RA). Because of the spiral path, there is a component of
electric field directed along the wire axi...