Magnetic field dependence of galfenol elastic properties | Zendy

Gabriela Petculescu | Zendy; K. B. Hathaway | Zendy; T. A. Lograsso | Zendy; M. WunFogle | Zendy; A. E. Clark | Zendy

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Magnetic field dependence of galfenol elastic properties

Author(s) -

Gabriela Petculescu,

K. B. Hathaway,

T. A. Lograsso,

M. WunFogle,

A. E. Clark

Publication year - 2005

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.1855711

Subject(s) - resonant ultrasound spectroscopy , magnetostriction , tetragonal crystal system , materials science , condensed matter physics , shear modulus , anisotropy , softening , shear (geology) , elastic modulus , moduli , magnetization , magnetic anisotropy , magnetic field , nuclear magnetic resonance , composite material , crystallography , chemistry , crystal structure , optics , physics , quantum mechanics

Elastic shear moduli measurements on Fe100−xGax (x=12–33) single crystals (via resonant ultrasound spectroscopy) with and without a magnetic field and within 4–300 K are reported. The pronounced softening of the tetragonal shear modulus c′ is concluded to be, based on magnetoelastic coupling, the cause of the second peak in the tetragonal magnetostriction constant λ100 near x=28. Exceedingly high ΔE effects (∼25%), combined with the extreme softness in c′ (c′<10GPa), suggest structural changes take place, yet, gradual in nature, as the moduli show a smooth dependence on Ga concentration, temperature, and magnetic field. Shear anisotropy (c44∕c′) as high as 14.7 was observed for Fe71.2Ga28.8.

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