  In-medium masses of the pseudoscalar and vector open bottom mesons ($B$,
$\bar{B}$, $B_s$ and $B^*$, $\bar{B}^*$, $B_s^*$) are studied in the magnetized
nuclear matter by considering the effects of Dirac sea, within the chiral
effective model. The mass modifications arise due to the interactions of the
open bottom mesons with the nucleons and the scalar mesons, calculated in terms
of the scalar and number densities of the nucleons and the scalar fields
fluctuations. The effects of the magnetized Dirac sea lead to the considerable
changes in the scalar fields with magnetic field, which are related to the
light quark condensates. There is observed to be a (reduction) enhancement in
the light quark condensates with magnetic field, a phenomenon called (inverse)
magnetic catalysis.The contribution of the magnetic field on the Fermi sea of
nucleons are taken into account through the Landau energy levels of protons and
anomalous magnetic moments (AMMs) of the nucleons. The additional contribution
of the lowest Landau level for the charged mesons are considered. The
spin-magnetic field interaction between the longitudinal component of the
vector and the pseudoscalar mesons ($B^{*||}(\bar{B}^{*||})-B (\bar{B}))$ and
($B_s^{*||}-B_s$) are studied, which lead to a level repulsion between their
masses with magnetic field. Magnetic fields are observed to have significant
contribution on the in-medium masses of the open bottom mesons through the
Dirac sea effect as comparedto the case when this effect is not considered. In
vacuum, considerable changes are obtained only due to the magnetized Dirac sea
at zero and finite nucleonic AMMs.
