Magnetomechanical damping capacity of Tb/sub x/Dy/sub 1-x/Fe/sub 1.92/(0.30/spl les/x/spl les/0.50) alloys

The stress-strain hysteresis losses of Tb/sub x/Dy/sub 1-x/Fe/sub 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 /spl sim/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/m/sup 3/ at x=0.30 to 10 kJ/m/sup 3/ 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.