Tailoring magnetostriction and magnetic domains of <100>-oriented Fe80Ga16Al4 alloy by magnetic field annealing

Magnetic field annealing (MFA) was used to tailor the magnetostriction and magnetic domains of Fe(80)Ga(16)Al(4)alloy, and the relationship between the two characteristics was studied. The < 100 >-oriented alloy was prepared by the directional solidification technique and annealed for 20 min at 700 degrees C in a magnetic field of 250 mT along a direction 45 degrees to the < 100 > orientation, followed by furnace cooling in the same magnetic field. The magnetostriction along the length direction (lambda(parallel to)), the width direction (lambda perpendicular to) and the saturation magnetostriction (lambda(s)) was changed from lambda(parallel to) = 208 x 10(-6) and lambda perpendicular to = - 16 x 10(-6) of the initial alloy to lambda(parallel to) approximate to - lambda perpendicular to approximate to 1/2 lambda(s) approximate to 112 x 10(-6) after MFA. The magnetic domain structure, which mainly refers to the number, size, and direction of the domains, was tailored and rearranged by MFA. This rearrangement of the magnetic domain structure resulted in a shift of magnetostrictive properties parallel and perpendicular to the < 100 > orientation for the Fe80Ga16Al4 alloy. This magnetic field annealing method can aid understanding of the relationship between the microscopic magnetic domains and the macroscopic magnetostrictive properties. It can also aid in further tailoring better magnetostrictive properties within magnetostrictive materials to meet the requirements of different application conditions.

Automated summary

The study investigated the use of Magnetic Field Annealing (MFA) to tailor the magnetostriction and magnetic domain structure of Fe(80)Ga(16)Al(4) alloy. The MFA process changed the magnetostrictive properties and rearranged the magnetic domain structure of the alloy, showing potential for improving magnetostrictive properties in magnetostrictive materials.