  The present work identify an island in the values of dimensionless parameter
$\chi$ as +0.10 $<$ $\chi$ $<$ +0.55 outside which no magnetic rotational (MR)
bands due to the repulsive interaction would be observed. The semi-classical
calculations within the hybrid shears mechanism with the principal axis
cranking model (HSPAC) reveal the possibility of the shears band due to the
attractive interaction for nuclei in A $\sim$ 140 region. Though the limited
information exists in literature, the HSPAC calculation exhibits the dipole
bands above the 4389-keV and 4160-keV excited states in $^{145}$Sm and
$^{146}$Eu nuclei, respectively, demand their candidature of the attractive
shears bands. Other interesting consequence of the HSPAC calculations is the
increasing nature of the $B(M1)$ and $B(E2)$ transition strengths with spin
unlike the decreasing nature of the transition strengths ($B(M1)$ and $B(E2)$
values) of the MR bands. Thus measurement of the transition probability has
been required on urgent basis to validate the strong candidature of such an
extreme excitation mechanism in $^{145}$Sm and $^{146}$Eu nuclei.
