Giant magnetostrictive spring magnet type multilayers

Quandt, Eckhard; Ludwig, Alfred; Betz, J.; Mackay, K.; Givord, D.

doi:10.1063/1.364558

Cited by 74 publications

(31 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their major advantages over other smart materials include remote control operation, simple actuator designs, and compatibility with semiconductor manufacturing processes that facilitates integration in current microelectronic technologies [4][5][6][7][8] . To fully exploit their capabilities and meet the stringent needs of microactuator and sensor applications, small driving magnetic fields on the order of mT are desirable.…”

mentioning

confidence: 99%

Giant magnetostriction in annealed Co1−xFex thin-films

et al. 2011

View full text Add to dashboard Cite

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 lowsaturation 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.

show abstract

mentioning

confidence: 99%

Giant magnetostriction in annealed Co1−xFex thin-films

et al. 2011

View full text Add to dashboard Cite

show abstract

“…6 we display, as an example, the σ(b, a) and σ(b, b) magnetoelastic stresses for the thin Ho layers superlattice Ho 8 /Lu 15 . The isotherms were done in the temperature range from 10 to 160 K (the lower limit of 10 K was chosen to avoid the superconductivity of the Nb layer present in the samples, appearing below 9 K, which uncontrollably modifies the magnetization and the magnetoelastic stress measurements).…”

Section: Magnetoelastic Behavior Of Ho/lu Superlatticesmentioning

confidence: 99%

“…By solving the system of Eqs. (13), (14), and (15) we obtain these MEL parameters as a function of the MEL stresses which can be determined from the experimental results (see Sec. 3 below).…”

Section: Relation Between Curvatures and Magnetoelastic Stresses Paramentioning

confidence: 99%

“…The well-known REFe 2 (RE: rare earth or rare-earth alloy) Laves phases appear as good candidates to fulfil the necessary requirements for applications. The magnetostriction of bulk single-crystal and polycrystalline REFe 2 was thoroughly studied in the 1970's and a noticeable effort has been made in the last years to produce amorphous and polycrystalline RE-TM (TM: transition metal) films and spring-magnet type multilayers of with improved magnetoelastic properties [9,15]. However, the intrinsic magnetoelastic behavior of thin-film samples had not been compared with that of crystalline bulk materials due to the lack of REFe 2 single-crystal films.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetoelastic stresses in rare-earth thin films and superlattices

Arnaudas

Ciria

Fuente

et al. 2001

Low Temperature Physics

View full text Add to dashboard Cite

A rn auda s J. I., Cir i a M., de la Fu ente C., Beni to L., del Mo ral A. , War d R . C. C., Wells M . R ., Dufou r C ., Dume snil K ., an d Mou gi n A. Mag net oelastic str esses in ra re-ea rth thin fil m s and sup erl at ti cesA rna udas J. I., Cir ia M ., de la Fue nte C ., B enito L., del Mor al A., Ward R. C. C., W ell s M . R. , Du four C ., Du mesn i l K., and Mougin A.M ag neto elastic str esses in rar e-ear th th i n fi lms a nd supe rl att i c es We report on the study of the magnetoelastic behavior of some rare-earth based thin films and superlattices (SL's). Magnetoelastic stress (MS) measurements (by using a cantilever capacitive technique) within a wide range of temperatures (10-300 K) and magnetic fields (up to 12 T) have been performed. We derive expressions relating the cantilever curvatures and the magnetoelastic stresses in anisotropic thin films and SL's (for cubic symmetry) deposited onto crystalline substrates. The magnetoelastic energy associated to the interfaces and the epitaxial stress dependence of the volume MS has been investigated by studying the basal plane MS in Ho n /Lu 15 and in Ho 10 /Y m SL's: we obtain interface MS even higher than the volume ones and the effect in bulk's MS of the epitaxial strain is large. In Dy/Y and Er/Lu SL's we also deduce the MS contributions but, for Er/Lu, incomplete saturation leads to inconclusive results. Although the latter case also happens in Ho/Tm SL's, MS clearly shows anisotropy competition. In TbFe 2 (t)/YFe 2 (1000 A°) (300 A° < t < 1300 A°) epitaxial bilayers, we determine all the MS allowed by the symmetry and show that epitaxial stress strongly modifies the tetragonal MS. The thermal dependence of MS parameters is also analysed. PACS: 75.70.-i, 75.80.+q

show abstract

“…1 A further decrease in switching field is possible by use of magnetic multilayers based on Kneller's exchange spring mechanism. [8][9][10][11][12] These approaches essentially represent the materials limits to further reduce the switching fields.…”

mentioning

confidence: 99%