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An improved soft film biased magneto-resistive sensor is produced by the use of a ternary alloy consisting of NiFe permalloy with a small quantity of a third element such as rhodium.
English (United States)
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NiFeRh Soft Film Biased Magneto-Resistive Sensors
An improved soft film biased magneto-resistive sensor is produced by the
use of a ternary alloy consisting of NiFe permalloy with a small quantity of a third
element such as rhodium.
One of the hard-axis bias schemes for magneto-resistive heads has involved
the use of so called "soft film." The soft film is a low coercivity (i.e. "soft")
magnetic film which is deposited close to but separated from the magnetic
sensor film. When a current is passed through the sensor, the resulting magnetic
field magnetizes the soft film in such a manner that the magnetic field of the
magnetized soft film biases the sensor film properly. The material commonly
used for the soft film is permalloy (Ni .8 Fe .2). This usage has the undesirable
result that when the sensor "reads," the soft film also "reads" and the signal from
the soft film subtracts from that of the sensor thereby resulting in reduced
amplitude and possible bit shift.
It is proposed that the soft film be made of a material differing from the
sensor film in that it has a much lower magneto-resistance and a larger zero field
resistivity. The lower magneto-resistance insures that the "reading" of data by
the soft film will be reduced. The higher resistivity results in more of the sense
current passing through the sensor thereby increasing the signal amplitude. It is
necessary that the soft film be soft magnetically so that it is easily magnetized
and it is necessary that...