Magnetostriction of single-crystal SmCo5 and of liquid-phase sintered SmCo5 permanent magnet material

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Abstract
This paper reports measurements of the magnetostriction in both single‐crystal SmCo5 and in the liquid‐phase sintered (LPS) SmCo5 permanent magnet material at fields up to μoH=21 T. By using a strain‐gauge technique the changes in length in different crystallographic directions were measured as a function of the field applied perpendicular to the c axis. Extrapolation of one of the measurements shows that there would be a contraction perpendicular to the c axis of almost 10−3 cm/cm at saturation along the same direction. The magnetostriction had the expected field dependence in SmCo5 except for the measurement containing a contribution from shear. In demagnetized LPS material, the field dependence of the magnetostriction was altered in some cases from that in the single crystal. In one case, the field dependence changed dramatically following magnetization of the LPS material parallel to the c axis.