Amorphous ribbons of the composition (Fe1-xRx)80B20 (R = Y, Ce, Pr, Nd, Sm, Gd, Ho, Er, Tm, Lu) (0 less-than-or-equal-to x less-than-or-equal-to 0.08) were studied by means of disaccommodation measurements, pinning field, and coercivity measurements. The after-effect scales roughly with the square of the magnetostriction constant. The concentration dependence of the pinning field can be correlated with that of the coercivity.