Magnetostrictive properties of directional solidification Fe82Ga9Al9 alloy

Abstract

Abstract"Fe82Ga9Al9 alloy rod was prepared by the directional solidification (DS) method. The effects of uniaxial compressive stress on magnetostriction of the alloy and the temperature dependence of magnetostriction were investigated. The results show that the magnetostriction increases from 135 x 10(-6) at 2.3 MPa to 221 x 10(-6) at 53 MPa and then remains at this value between 53 MPa and 90 MPa. This enhancement results from domain rotation under the compressive stress. The temperature dependence results show that the saturated magnetostriction decreases by 11% (25 degrees C-120 degrees C) and 13% (25 degrees C-100 degrees C) for samples with 0 MPa and 15 MPa compressive stress applied, respectively. This decrease is due to reduced magnetic crystalline anisotropy as the temperature increases. Under the compressive stress conditions, the magnetostriction decreases more notably. Fe 82 Ga 9 Al 9 alloy rod was prepared by the directional solidification (DS) method. The effects of uniaxial compressive stress on magnetostriction of the alloy and the temperature dependence of magnetostriction were investigated. The results show that the magnetostriction increases from 135 Â 10 À6 at 2.3 MPa to 221 Â 10 À6 at 53 MPa and then remains at this value between 53 MPa and 90 MPa. This enhancement results from domain rotation under the compressive stress. The temperature dependence results show that the saturated magnetostriction decreases by 11% (25 C-120 C) and 13% (25 C-100 C) for samples with 0 MPa and 15 MPa compressive stress applied, respectively. This decrease is due to reduced magnetic crystalline anisotropy as the temperature increases. Under the compressive stress conditions, the magnetostriction decreases more notably.

Determination of bulk domain structure and magnetization processes in bcc ferromagnetic alloys: Analysis of magnetostriction in Fe83Ga17

“…Useful information can also be gleaned about the magnetization process from the shape of the magnetostriction curve. In particular, domain rotation process that pass through an auxetic 110 direction, or give rise to the E effect have characteristic signatures that have been observed but not previously explained in many magnetostriction measurement on Fe-Ga crystals [12,15,40,[43][44][45]. These processes do not necessarily conserve the sample volume, and they merit further investigation.…”

“…The effect is similar to applied stress, which favors domain orientation perpendicular to the stress direction. Data of [40] suggest the E effect in Fe 82 Ga 9 Al 9 may be of order 25%. Comparison of different magnetostrictive (MS) effects in Fe 83 Ga 17 alloys is shown in Table III.…”