  We have built a variable temperature scanning probe microscope (SPM) that
covers 4.6 K - 180 K and up to 7 Tesla whose SPM head fits in a 52 mm bore
magnet. It features a temperature-controlled sample stage thermally well
isolated from the SPM body in good thermal contact with the liquid helium bath.
It has a 7 sample holder storage carousel at liquid helium temperature for
systematic studies using multiple samples and field emission targets intended
for spin-polarized spectroscopic-imaging scanning tunneling microscopy (STM)
study on samples with various compositions and doping conditions. The system is
equipped with a UHV sample preparation chamber and mounted on a two-stage
vibration isolation system made of a heavy concrete block and a granite table
on pneumatic vibration isolators. A quartz resonator (qPlus) based non-contact
atomic force microscope (AFM) sensor is used for simultaneous STM/AFM operation
for research on samples with highly insulating properties such as strongly
underdoped cuprates and strongly correlated electron systems.
