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In this work,a magnetic annealing method used to enhance the magnetostrictive property of a narrow hysteresis alloy Tb_(0.26)Dy_(0.54)Ho_(0.20)Fe_2 is reported.Cylindrical-rod shaped specimen with <110> crystal orientation was fabricated using zone-melting unidirectional solidification technique,followed by annealing in a transverse magnetic field of 366 kA/m.The crystal orientation and bi-phase solidified morphology can be retained after magnetic annealing.A high magnetostriction of 1.508×10-3 was obtained in the magnetically annealed specimen,which is 25.2% larger than the untreated one.Simultaneously,the magnetostriction hysteresis width is slightly enlarged from 4.45 to 6.36 kA/m,which is still much lower than that of the Ho-free Tb0.3Dy0.7Fe2 alloy.The additional anisotropy which is induced by magnetic annealing,as reflected by the magnetic hysteresis loops,is responsible for the enhancement of magnetostrictive performance.
In this work, a magnetic annealing method used to enhance the magnetostrictive property of a narrow hysteresis alloy Tb_ (0.26) Dy_ (0.54) Ho_ (0.20) Fe_2 is reported. Cylindrical-rod shaped specimen with <110> crystal orientation was fabricated using zone -melting unidirectional solidification technique, followed by annealing in a transverse magnetic field of 366 kA / m. The crystal orientation and bi-phase solidified morphology can be retained after magnetic annealing. A high magnetostriction of 1.508 x 10-3 was obtained in the magnetically annealed specimen, which is 25.2% larger than the untreated one. Simultaneously, the magnetostriction hysteresis width is slightly enlarged from 4.45 to 6.36 kA / m, which is still much lower than that of the Ho-free Tb0.3Dy0.7Fe2 alloy. additional anisotropy which is induced by magnetic annealing, as reflected by the magnetic hysteresis loops, is responsible for the enhancement of magnetostrictive performance.