  We present a single-crystal neutron diffraction study on the
Shastry-Sutherland lattice system TbB$_4$ at zero magnetic field and under
pulsed high magnetic fields up to 35 T applied along the crystallographic $c$
axis. While our results confirm the magnetic structures at zero-field as well
as those at the half- and full-magnetization plateaus, they offer new insight
into the $\frac{2}{9}$- and $\frac{1}{3}$-magnetization plateaus observed in
this system. A stripe model of polarized 4-spin-plaquettes whose stripe density
proportionally increases with the macroscopic magnetization is in full
agreement with the neutron diffraction data. Equally well suited alternative
models exist which explain the observed Bragg peaks which are inherently
limited in a pulsed high magnetic field experiment. We discuss the different
intensity distribution in $Q$ space which can be used to distinguish these
models in future experiments.
