Negative magnetostrictive paper formed by dispersing CoFe2O4 particles in cellulose nanofibrils

Polymers are often combined with magnetostrictive materials to enhance their toughness. This study reports a cellulose nanofibril (CNF)-based composite paper containing dispersed CoFe2O4 particles (CNF-CoFe2O4). Besides imparting magnetization and magnetostriction, the incorporation of CoFe2O4 particles decreased the ultimate tensile strength and increased the fracture elongation of the CNF-CoFe2O4 composite paper. CNF was responsible for the tensile properties of CNF-CoFe2O4 composite paper. Consequently, the magnetic and magnetostrictive properties and tensile properties of CNF-CoFe2O4 composite paper can be controlled by changing the mixture ratio of CNF and CoFe2O4 particles.