title: Giant magnetostriction in annealed Co(1-x)Fe(x) thin-films.
abstract: Chemical and structural heterogeneity and the resulting interaction of coexisting phases can lead to extraordinary behaviours in oxides, as observed in piezoelectric materials at morphotropic phase boundaries and relaxor ferroelectrics. However, such phenomena are rare in metallic alloys. Here we show that, by tuning the presence of structural heterogeneity in textured Co(1-x)Fe(x) thin films, effective magnetostriction λ(eff) as large as 260 p.p.m. can be achieved at low-saturation field of ~10 mT. Assuming λ(100) is the dominant component, this number translates to an upper limit of magnetostriction of λ(100)≈5λ(eff) >1,000 p.p.m. Microstructural analyses of Co(1-x)Fe(x) films indicate that maximal magnetostriction occurs at compositions near the (fcc+bcc)/bcc phase boundary and originates from precipitation of an equilibrium Co-rich fcc phase embedded in a Fe-rich bcc matrix. The results indicate that the recently proposed heterogeneous magnetostriction mechanism can be used to guide exploration of compounds with unusual magnetoelastic properties.
authors: Department of Materials and Science Engineering, University of Maryland, College Park, Maryland 20742, USA.
authors: Dwight
authors: D
authors: Hunter
authors: Will
authors: W
authors: Osborn
authors: Ke
authors: K
authors: Wang
authors: Nataliya
authors: N
authors: Kazantseva
authors: Jason
authors: J
authors: Hattrick-Simpers
authors: Richard
authors: R
authors: Suchoski
authors: Ryota
authors: R
authors: Takahashi
authors: Marcus L
authors: ML
authors: Young
authors: Apurva
authors: A
authors: Mehta
authors: Leonid A
authors: LA
authors: Bendersky
authors: Sam E
authors: SE
authors: Lofland
authors: Manfred
authors: M
authors: Wuttig
authors: Ichiro
authors: I
authors: Takeuchi