Magnetic anisotropy and giant magnetostriction of amorphous TbDyFe films

Abstract

The influence of internal stress on the magnetic anisotropy and the magnetostriction was investigated in sputter-deposited amorphous (Tb0.27Dy0.73)0.42Fe0.58 films. Films with tensile stress show in-plane anisotropy and giant magnetostriction of λ∥=400×10−6 at 1 T measured in a field parallel to the film plane at room temperature. The magnetostriction rises rapidly to λ∥=200×10−6 at 0.05 T and the coercivity is less than 0.01 T. On the other hand films with compressive stress show perpendicular anisotropy and still higher magnetostriction of λ∥=540×10−6 at 1 T; however, this is by far a slower increase of magnetostriction at small fields. This different behavior is explained by considering the nature of magnetization processes, i.e., domain-wall motion and spin rotation.

Sputter deposited Terfenol-D thin films for multiferroic applications

“…[10][11][12] The as-deposited films are always amorphous with relatively poor magnetic properties including magnetoelastic behavior. 13 The thin films must be crystallized to obtain mechanical and magnetic properties close to bulk Terfenol-D. This can be achieved either by depositing the film on a heated substrate or by post-annealing.…”

Ar Ion Beam Irradiation Effects on Magnetostrictive Characteristics of Tb-Fe Thin Film

“…4) The giant magnetostrictive films are affected by vacuum condition, chemical composition, microstructure, and internal stress. Among them, internal stress could dominate the magnetostrictive properties (Schatz et al, 1994, Xu et al, 2001). 13,14) Wada et al (1996) have reported that the magnetostrictive properties of Tb-Dy-Fe thin films prepared by ion beam sputtering system using Ar may be attributed to the internal stress induced by Ar inclusion during the deposition.…”

Altering magnetostrictive strain pathways via morphology of spontaneously aligned domains

“…5 Additional reduction in anisotropy is possible by making the films amorphous, 6,7 however, this also causes a reduction in the saturation magnetostriction (λ ~ 10 -4 ). 1 A further decrease in switching field is possible by use of magnetic multilayers based on Kneller's exchange spring mechanism.…”