MAGNETOSTRICTION MEASUREMENTS ON SOFT MAGNETIC RIBBONS

Roland Grössinger - Stephan Sorta - Reiko Sato Turtelli

   Different experimental possibilities to measure the magnetostriction are discussed. Special emphasis is laid on the measureme nt of the magnetostriction of ribbon shaped samples. For this purpose crystalline Fe₈₅Ga₁₅ ribbons, an amorphous Fe₆₆Co₁₈Si₁B₁₅ sample and a crystalline Fe_83.5Si_16.5 ribbon were investigated at room temperature. In this work, measurements of magnetostriction using SAMR and standard strain gauge methods were performed and the results were compared. In order to investigate the influence of stress on magnetostriction of Fe₈₅Ga₁₅, the hysteresis loop was measured applying different stresses. The stress dependence of the coercivity shows a minimum at around 120MPa, which value corresponds to the onset of deviation from the initial coefficient dH_dc/dσ in SAMR method.

Keywords: magnetostriction, strain gauge, SAMR method, ribbons

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