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The innovation in microwave absorbing material has increased exponentially to support telecommunication technology. Fe 3 O 4 could be one candidate for absorber material; however, Fe 3 O 4 still has lower permeability at high frequency and high density; thus, it fails to meet one of MAM's ideal characteristics. In this research, we try to make an excellent microwave absorber material by combining conventional microwave absorber Fe 3 O 4 with multi-walled carbon nanotubes and TiO 2 (Fe 3 O 4 /MWCNT/TiO 2 nanocomposites). Structural characterization results strongly suggested that the Fe 3 O 4 /MWCNT/TiO 2 nanocomposites have been successfully fabricated. The nanocomposite presented superparamagnetic properties and has a band gap energy range between 2.236 and 2.255 eV, which is suitable for microwave absorbers. We found that increased TiO 2 concentration in the nanocomposite enhanced the microwave absorption performance. The maximum reflection loss of this study was 44.3 dB with thicknesses of 20 mm, in which 99% of the microwave was absorbed by Fe 3 O 4 /MWCNT/TiO 2 , indicating excellent microwave absorption performance. [Display omitted] • The innovation in microwave absorbing material has increased exponentially to support telecommunication technology. • Fe 3 O 4 as absorber material still has limitations. We combine it with MWCNT and TiO 2 to enhance their absorption properties. • The Fe 3 O 4 /MWCNT/TiO 2 has superparamagnetic behavior. Its M s decreases with the increase of TiO 2 nanoparticles. • The addition of TiO 2 to the nanocomposite resulted in higher microwave absorbing power. • The RL in this study ranged from − 4.4 to − 44.3 dB which indicate 90–99% absorption ability of the microwave. [ABSTRACT FROM AUTHOR]