Magnetomechanical damping capacity of TbxDy1-xFe1.92(0.30≤x≤0.50) alloys

The stress-strain hysteresis losses of Tb_xDy_1-xFe_1.92(x=0.30, 0.33, 0.40, 0.45, and 0.50) were measured at a variety of magnetic fields between 0 and 1600 Oe. Stress ranges from ∼0 to -10, -20, -40, and -60 MPa (the minus sign indicates compressive stresses) were used. The hysteresis loop area increased from 5.7 kJ/m³ at x=0.30 to 10 kJ/m³ at x=0.50 as the Tb concentration and the magnetic anisotropy increased. The position of the hysteresis loop shifted to larger compressive stresses as the magnetic field was increased allowing the strength of the damping to be controlled by the magnetic field.