Composition anisotropy compensation and spontaneous magnetostriction in Tb[sub 0.2]Dy[sub 0.8-x]Pr[sub x](Fe[sub 0.9]B[sub 0.1])[sub 1.93] alloys

Ren, W. J.; Zhang, Z. D.; Song, X. P.; Zhao, X. G.; Jin, X. M.
April 2003
Applied Physics Letters;4/21/2003, Vol. 82 Issue 16, p2664
Academic Journal
The possibility of the composition anisotropy compensating in Dy[SUB1-x]Pr[SUBx]Fe[SUB2] is discussed phenomenologically, based on a single ion approach. The crystal structure, the easy magnetization direction, and the spontaneous magnetostriction of Tb[SUB0.2]Dy[SUB0.8-x]Pr[SUBx](Fe[SUB0.9]B[SUB0.1])[SUB1.93] (0 ⩽x⩽0.7) alloys are studied. Single-phase Tb[SUB0.2]Dy[SUB0.8-x]Pr[SUBx](Fe[SUB0.9]B[SUB0.1])[SUB1.93] with cubic MgCu[SUB2]-type structure forms up to x = 0.4 and the magnetostrictive phase exists in all the alloys studied. A single (440) peak of x-ray diffraction of the Laves phase exists when 0 ⩽ x ⩽ 0.3, but becomes doubly split when 0.4 ⩽ x ⩽ 0.7 because of a large spontaneous magnetostriction along its easy magnetization direction 〈111〉. Composition anisotropy compensation is realized in (Tb[SUB0.2]Dy[SUB0.8-x]Pr[SUBx](Fe[SUB0.9]B[SUB0.1])[SUB1.93] alloys. Tb[SUB0.2]Dy[SUB0.4]Pr[SUB0.4](Fe[SUB0.9]B[SUB0.1])[SUB1.93] alloy with the single Laves phase has a large magnetostriction (λ[SUB111] &asym; 1200 ppm) and a low anisotoropy, which may be a good candidate material for magnetostriction application.


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