  The design of an atomic force microscope with an all-fiber interferometric
detection scheme capable of atomic resolution at about 500 mK is presented. The
microscope body is connected to a small pumped 3He reservoir with a base
temperature of about 300 mK. The bakeable insert with the cooling stage can be
moved from its measurement position inside the bore of a superconducting 10 T
magnet into an ultra-high vacuum chamber, where tip and sample can be exchanged
in-situ. Moreover, single atoms or molecules can be evaporated onto a cold
substrate located inside the microscope. Two side chambers are equipped with
standard surface preparation and surface analysis tools. The performance of the
microscope at low temperatures is demonstrated by resolving single Co atoms on
Mn/W(110) and by showing atomic resolution on NaCl(001).
