Burst magnetostriction in Tb{sub 0.3}Dy{sub 0.7}Fe{sub 1.9}
- Riso/ National Laboratory, Materials Department, DK-4000 Roskilde (Denmark)
The magnetostriction and magnetic induction calculated by a continuous, anisotropic, anhysteric, magnetization model are compared with magnetostriction and magnetic induction measurements on burst and nonburst magnetostrictive Tb{sub 0.3}Dy{sub 0.7}Fe{sub 1.9} twinned single crystal rods. The model shows that the magnetostriction and permeability suppression occurring at low applied field is the result of the rotation, and subsequent capture, of initial field antiparallel magnetization into field transverse [11{bar 1}] or [{bar 1}{bar 1}1] local magnetoelastic energy minima. The model further shows that the interval of high magnetostriction applied field derivative, d{lambda}/dH is the result of the rotation of field transverse [11{bar 1}] or [{bar 1}{bar 1}1] oriented magnetization into the [111] near field magnetocrystalline minima. The occurance of burst magnetostriction is therefore contingent on obtaining sufficient magnetocrystalline anisotropy and sufficiently tight magnetization energy distribution in experimental Tb{sub 0.3}Dy{sub 0.7}Fe{sub 1.9} twinned single crystal rods so as to minimize the applied field interval over which this magnetization rotation process occurs. The present model is able to correctly approximate the applied field dependence of the burst magnetostriction response and the applied field dependence of the simultaneous magnetostriction and permeability suppression with a single set of parameters for a range of constant [112] applied compressive stresses, and correct saturation magnetostrictions for a range of experimentally applied compressive stresses. However, the model fails to match the experimental behavior above a simultaneous d{lambda}/dH, permeability and field hysteresis transition, located approximately 1000 microstrain from the saturation magnetostriction. The experimental transition clearly indicates a change in magnetization mechanism not accommodated by the present model. (Abstract Truncated)
- OSTI ID:
- 554248
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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