  An ongoing process of miniaturization of spintronics and magnetic-films-based
devices, as well as a growing necessity for basic material research place
stringent requirements for sensitive and accurate magnetometric measurements of
minute magnetic constituencies deposited on large magnetically responsive
carriers. However, the most popular multipurpose commercial superconducting
quantum interference device (SQUID) magnetometers are not object-selective
probes, so the sought signal is usually buried in the magnetic response of the
carrier, contaminated by signals from the sample support, system instabilities
and additionally degraded by an inadequate data reduction. In this report a
comprehensive method based on the in situ magnetic compensation for mitigating
all these weak elements of SQUID-based magnetometry is presented. Practical
solutions and proper expressions to evaluate the final outcome of the
investigations are given. Their universal form allows to employ the suggested
design in investigations of a broad range of specimens of different sizes,
shapes and compositions. The method does not require any extensive numerical
modelling, it relies only on the data taken from the standard magnetometer
output. The solution can be straightforwardly implemented in every field where
magnetic investigations are of a prime importance, including in particular
emerging new fields of topological insulators, 3D-Dirac semimetals and
2D-materials.
