EFFECT OF 'OVERLAPPING' VOLTAGE CONTACTS IN PLANAR ...

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urlth respect to a pomt-contact at the edge The depth of the overlapping
contact has a larger influence than the width If upper voltage contacts are
chosen (for mstance, because of a simpler technological procedure), a PHT
can have contacts of reasonable size mthout losmg too much output A PHT
mth mammal-sized lower overlappmg contacts can have a higher output and
better resolution than an identically sized MR-head m strong mhomogeneous
fields such as those induced by thin recordmg media The resolution of a
PHT with mmimal-sized upper overlappmg contacts 1s always lower than
that of an MR-head Thus rf one has the technologzal posslblhty to make
a PHT with lower contacts (an lsolatmg layer T;vlth contact holes 1s requrred),
this can be a good alternative to the (barber-pole) MR-head as far as output
and resolution are concerned
Acknowledgements
The author urlshes to thank J H. J Flultman for his helpful dlscusslons
and would like to acknowledge F P H van Beckum for his suggestions
concemmg the mathematical problems Fmally the author 1s mdebted to
P F C Colenbrander for his help with the mathematics and use of the
computer
References
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J H J Flultman and J P J Groenland, Companson of a shielded ‘one-sided’ planar
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J H J Flultman, On the calculatxon of the response of (planar) Hall-effect devices m
mhomogeneous fields, Sensors and Actuators, 2 (1981/82) 155 - 170
J H J Flultman, Recordmg head field measurement with a magnetoreslstlve trans-
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