Interaction of Trace Rare-Earth Dopants and Nanoheterogeneities Induces G iant Magnetostriction in Fe-Ga Alloys

• Date:2025-04-30
• Title of Paper:Interaction of Trace Rare-Earth Dopants and Nanoheterogeneities Induces G iant Magnetostriction in Fe-Ga Alloys
• Journal:Advanced Functional Materials
• Summary:The discovery of a tenfold increase in magnetostriction of Fe by alloying nonmagnetic Ga was a breakthrough in magnetostrictive materials. The large magnetostriction is attributed to tetragonal nanoheterogeneities dispersed in the bcc matrix. A further remarkable fivefold increase is achieved by trace rare earth doping (<1 at%) up to a value of ≈1500 ppm, more than 50 times that of pure iron. However, it remains a mystery why trace rare earth dopants can induce such giant magnetostriction. Here, it is found that interaction of rare earth dopants with the nanoheterogeneities produces the giant magnetostriction, through a combination of experimental studies, first‐principles calculation and phase field simulations. The dopants tend to enter the nanoheterogeneities, increasing their distortion thereby creating a larger tetragonal distortion of the matrix as well as increased magnetocrystalline anisotropy. A mesoscopic …
• Co-author:Yangkun He; Xiaoqin Ke; Chengbao Jiang; Naihua Miao; Hui Wang; John Michael David Coey; Y unzhi Wang; Huibin Xu
• Volume:28
• Page Number:20
• Translation or Not:No
• Date of Publication:2018-05-01