|
The facility is a state-of-the-art magneto-optical imaging system
built on a Nikon polarized light microscope. A solenoid mounted at
the base of the column can produce external magnetic fields of 0 -
0.12 T oriented either in the plane or normal to the plane of the
sample. The detector system uses Bi -doped ferromagnetic garnet
indicator films with in-plane magnetic anisotropy. This unique
ferromagnetic indicator material measures the perpendicular
component of the magnetic field above the surface of the sample
with a spatial resolution of ~ 5 microns. Images are collected with
analog or digital cameras. The local magnetic field above the
sample can be compared directly with conventional light
microscope images of the same region for studies of
structure-property relationships. A He-flow cryostat allows control
of the sample temperature from room temperature down to as low
as ~7 K. Specialized image analysis software for analysis of the
magnetic field distribution above superconducting samples is
integrated into the system.
|