Magnetostriction of rare earth<inf>2</inf>-iron<inf>17</inf>compounds

Abstract

The magnetostrictions of polycrystal R <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</inf> compounds (R=Y,Pr,Sm,Tb,Dy,Ho,Er, and Tm) were measured in the temperature range from 4.2K to 340K in magnetic fields up to 25kOe. Pr <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</inf> exhibited the highest magnetostriction at OK of all the compounds studied: λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</inf> (0) = 1250 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-6</sup> . For R=Pr,Ho,Er, and Tm compounds the volume magnetostriction and thermal expansion coefficients were measured near the magnetic ordering temperature T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> . These are compared using classical thermodynamic theory.