While the principles of the ac susceptibility technique are
relatively simple and well understood, there are still numerous
possible variations in construction of practical susceptometer
devices. The construction of our CryoBIND devices primarily
targets the problem of sensitivity, a decisive quantity in
measurements of small magnetic signals. In many cases the
signals are small either due to the reduced sample volume (small
single crystals, thin films) or it is small due to intrinsic
reasons (like in paramagnets far above their ordering
temperature). Design of the sample/sensor core of our
susceptometry provides an inherent thermal stability revealing,
depending on the model, very small or entirely suppressed offset
voltages. The system design and construction, involved
instrumentation, together with offset compensation, are all
responsible for unsurpassed sensitivity of our integrated
measuring systems: Expressed in equivalent magnetic moment it
reaches almost 10exp-9 EMU. Noteworthy, the CryoBIND devices
reach this sensitivity level, more commonly approached by the
use of SQUID instrumentation, in very small measuring magnetic
fields and in the frequency range of the driving field below 1
kHz. CryoBIND systems integrate low-helium consumption
nitrogen-jacketed glass, all-fibreglass, or stainless steel
dewars. Depending on the model there are either manual or
software control over the particular mechanical functions
(sample positioning, vacuum valve settings). Measuring systems
are delivered with powerful software for measurement execution
and data acquisition.
LK-99 Update
The most straightforward and reliable method for
demonstration/quantification of superconductivity of your
LK-99 samples is AC susceptibility. Whether you are a
prominent research laboratory involved in
synthesis/characterisation or a start-up company let we do the
AC susceptibility measurement on your sample in the
temperature range 100 K-400 K using the most sensitive
non-SQUID-based instrumentation (search the site!). The cost
of each 100 K-400 K run, possibly differing in strengths of
applied AC and DC fields and their frequencies, is 850 EU.
