Wide-range Modulation of Dynamic Modulus and Loss Tangent for Magnetic Elastomers Containing Submilimeter Magnetic Particles

Magnetic elastomers containing magnetic particles with a diameter of 235 mu m have been synthesized, and the magnetic response of the elasticity was investigated. The storage modulus for the magnetic elastomer with a volume fraction of 0.18 increased from 12.5 kPa to 2.43 MPa by applying a magnetic field of 500 mT. The relative change in the storage modulus was 194 times, which is higher than that of magnetic elastomers containing small iron particles (ca. 58 times at 2.5 mu m). It was also revealed that the magnetic elastomer exhibited wide-range modulation of loss tangent by varying magnetic fields.