**5. Conclusions**

In this review, we briefly overviewed fabrication, characterizations, properties, and applications of smart MREs composed of various magnetic particles, elastomers, and additives based on the recent studies. Especially, various polymeric elastomeric materials including waste tire rubber are extensively covered. While the morphology of iso/anisotropic MREs was typically observed with SEM images along with their synthesis and physical characteristics, the mechanical properties of MREs are explained based on tensile strength, Payne e ffect and loss factor. The MR performance of anisotropic MRE was superior than that of isotropic MRE. Accordingly, the mechanical characteristics of surface coated based MRE was observed stronger than the pure CI particle coated MRE due to the enhanced bonding energy between rubber matrix and CI particle. The MR analysis of MRE under various range of magnetic field is conducted with strain amplitude and frequency sweep. According to the MR property measurements, the G' increases with high magnetic field and at various strain. Hence, the MRE has been drawn a grea<sup>t</sup> attention on various applications, such as absorber, isolator, sensor and EMI shielding.

**Author Contributions:** S.S.K. and K.C. prepared the draft together with the guidance of H.J.C and J.-D.N., H.J.C. initiated and finalized this review paper. S.S.K. and K.C. contributed equally to this work. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by National Research Foundation of Korea, gran<sup>t</sup> number 2018R1A4A1025169.

**Conflicts of Interest:** The authors declare no conflict of interest.
