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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-classicalcalculations within the hybrid shears mechanism with the principal axiscranking model (HSPAC) reveal the possibility of the shears band due to theattractive interaction for nuclei in A $\sim$ 140 region. Though the limitedinformation exists in literature, the HSPAC calculation exhibits the dipolebands above the 4389-keV and 4160-keV excited states in $^{145}$Sm and$^{146}$Eu nuclei, respectively, demand their candidature of the attractiveshears bands. Other interesting consequence of the HSPAC calculations is theincreasing nature of the $B(M1)$ and $B(E2)$ transition strengths with spinunlike the decreasing nature of the transition strengths ($B(M1)$ and $B(E2)$values) of the MR bands. Thus measurement of the transition probability hasbeen required on urgent basis to validate the strong candidature of such anextreme excitation mechanism in $^{145}$Sm and $^{146}$Eu nuclei.

Possibility of shears mechanism due to attractive interaction in the island of $A$ $\sim$ 140 region