Dynamic magnetomechanical properties of Sm0.88Dy0.12Fe1.93/epoxy composites

Abstract The dynamic magnetomechanical properties of Sm 0.88 Dy 0.12 Fe 1.93 /epoxy composites with 51 vol% Sm 0.88 Dy 0.12 Fe 1.93 particles were investigated. The dynamic relative permeability ( μ r33 ) showed a flat response with frequency for all bias fields ( H Bias ) apart from the fundamental-shape-resonance-induced variations in the vicinity of 42 kHz. The free ( μ r 33 T ) and clamped ( μ r 33 S ) permeabilities attained their maximum values at H Bias = 20 kA / m . The elastic modulus at constant field strength ( E 3 H ) and that at constant flux density ( E 3 B ) exhibited a steady negative – Δ E effect for H Bias ⩽240 kA/m. The dynamic strain coefficient ( d 33 ) displayed a broad negative maximum around H Bias = 180 kA / m .