Details

Autor(en) / Beteiligte

• Pinkerton, F.E.
• Herbst, J.F.
• Olk, C.H.
• Meyer, M.S.
• Moleski, J.J.

Titel

Tb 1− xDy xFe 2/Fe composites: compositional effects on torque response

Ist Teil von

• Journal of magnetism and magnetic materials, 2002, Vol.241 (2), p.162-172

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2002

Link zum Volltext

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Magnetostrictive composites of melt-spun Tb 1− x Dy x Fe 2 in an Fe matrix spanning the entire Tb–Dy composition range ( x = 0, 0.2, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1) have been prepared by hot pressing. Equal volumes of the two components and identical consolidation procedures were used for each composition. We find that the saturation magnetostriction λ S, a measure of the direct magnetostrictive effect in the composites, decreases monotonically, but not linearly, with increasing Dy content x from ∼580 ppm for TbFe 2 to ∼120 ppm for DyFe 2. In contrast, the torque response R τ in a ring sensor configuration, which is a measure of the inverse magnetostrictive effect, varies by an order of magnitude over the composition interval and exhibits a peak value of R τ = 6 G/100 ppm at x=0.5. This value is almost three times larger than the response of maraging steel in the same sensor configuration. The magnetostrictive ribbon and Fe matrix components of the x=0.5 composite were also examined with phase-contrast magnetic force microscopy (MFM) and atomic force microscopy (AFM).