Abstract
Amorphous and nanocrystalline giant magnetostrictive thin films of the composition (Tb 0.3Dy 0.7) 40(Fe 0.95X 0.05) 60 (X=Nb, Zr) have been prepared by DC magnetron sputtering at substrate temperatures of T S=440 and 470°C. At T S=440°C the films are amorphous and present magnetostriction of ≈350 ppm at the maximum applied field, 4 kOe, and at room temperature, which is comparable to those without Nb or Zr. In the case of the Nb samples deposited at 470°C, nanocrystalline films with room-temperature magnetostriction as large as 500 ppm at 4 kOe and with coercivity lower than 30 Oe are obtained.
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