  We investigate the magnetic field distribution near the surface of a magnetic
superconductor when a magnetic source is placed close to the superconductor.
The magnetic field distribution can be measured by magnetic force microscopy
and scanning SQUID microscopy, from which one can extract both the penetration
depth $\lambda_L$ and magnetic susceptibility $\chi$. When the magnetic moments
are parallel to the surface, one extracts $\lambda_L/\sqrt{1-4\pi \chi}$. When
the moments are perpendicular to the surface, one obtains $\lambda_L$. By
changing the orientation of the crystal, one thus is able to extract both
$\chi$ and $\lambda_L$.
