Magnetic microsensors with the active area volume of 10(-5) mm(3) are fabri
cated on the basis of III-V semiconductor microcrystals. To improve the rad
iation resistance of magnetic microsensors complex metallurgical doping was
applied to semiconductor microcrystals during growth. In addition to a bas
ic donor dopant, rare-earth elements and special extras which are able to b
ind oxygen and act as drains for radiation defects are introduced. All that
slows down the process of deep acceptor level complexation by means of rad
iation defects and background impurities, and improves the radiation resist
ance of sensors. Studies of effect of fast neutrons irradiation with energi
es from 0.1 divided by 13 MeV and fluence of 10(14) n cm(-2) were carried o
ut. It has been shown that at the mean sensitivity change of 0.12% for the
set of InSb-based microsensors with the electron concentration of (1 divide
d by 3) . 10(17) cm(-3), for 60% of these microsensors the change does not
exceed the determination error +/- 0.04%. The investigations have shown the
relevance of the continuation of works directed to further improvement of
the magnetic microsensor radiation resistance. (C) 1999 Elsevier Science S.
A. All rights reserved.