  The interface of two dissimilar materials is well known for surprises in
condensed matter, and provides avenues for rich physics as well as seeds for
future technological advancements. We present some exciting magnetization (M)
and remnant magnetization ($\mu$) results, which conclusively arise at the
interface of two highly functional materials, namely the graphitic shells of a
carbon nanotube (CNT) and $\alpha$-Fe$_2$O$_3$, a Dzyaloshinskii-Moriya
Interaction (DMI) driven weak ferromagnet (WFM) and piezomagnet (PzM). We show
that the encapsulation inside CNT leads to a very significant enhancement in M
and correspondingly in $\mu$, a time- stable part of the remanence, exclusive
to the WFM phase. Up to 70% of in-field magnetization is retained in the form
of $\mu$ at the room temperature. Lattice parameter of CNT around the Morin
transition of the encapsulate exhibits a clear anomaly, confirming the novel
interface effects. Control experiments on bare $\alpha$-Fe$_2$O$_3$ nanowires
bring into fore that the weak ferromagnets such as $\alpha$-Fe$_2$O$_3$ as are
not as weak, as far as their remanence and its stability with time is
concerned, and encapsulation inside CNT leads to a substantial enhancement in
these functionalities.
