Title :
The stress dependence of k33, d33 , λ and μ in Tb0.3Dy0.7Fe1.95
Author :
Schulze, M.P. ; Greenough, R.D. ; Galloway, N.
Author_Institution :
Dept. of Appl. Phys., Hull Univ., UK
fDate :
9/1/1992 12:00:00 AM
Abstract :
DC field measurements of λ, d33, k 33, and μ under uniaxial prestresses up to ~20 MPa have made on a 152-mm-long 6-mm-diameter grain-oriented rod of Tb0.3Dy07Fe1.95 prepared by a free float zone technique. The λ-vs.-H curve shows a negative dip at low fields which persist to ~20 MPa. The maximum negative strains ~-120 ppm occur under ~2 MPa, which is also the pressure at which optimum permeability and magnetomechanical coupling occur. The origin of the negative strains is discussed in the light of earlier predictions based on an anisotropic rotational model for magnetization and magnetostriction, and the practical consequences are examined
Keywords :
dysprosium alloys; ferromagnetic properties of substances; iron alloys; magnetic permeability; magnetomechanical effects; magnetostriction; terbium alloys; DC field measurements; Tb0.3Dy0.7Fe1.95; Terfenol-D; anisotropic rotational model; free float zone technique; magnetization; magnetomechanical coupling; magnetostriction; maximum negative strains; optimum permeability; stress dependence; uniaxial prestresses; Anisotropic magnetoresistance; Couplings; Iron; Magnetic anisotropy; Magnetic field induced strain; Magnetic field measurement; Magnetostriction; Permeability; Perpendicular magnetic anisotropy; Stress;
Journal_Title :
Magnetics, IEEE Transactions on
