کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1529659 | 995765 | 2012 | 5 صفحه PDF | دانلود رایگان |
Typically the value of the magnetostrictive coefficient (λ) observed for bulk magnetic materials such as cubic ferrites is 10−6. However, giant magnetostriction (λ ≤ 10−3) is only observed in a few bulk intermetallic materials based on alloys of rare earth and iron such as TbFe, TbFe2, DyFe2 and Terefenol-D. While giant magnetostriction is known in nanostructured films, we show for the first time, this phenomenon occurs in magnetic nanoparticles. By using in-field small angle X-ray scattering (SAXS) as a tool, we demonstrate that a 4% relative change in dimension of the particle can be observed in 5.0 nm Fe3O4 nanoparticles at room temperature with 1 kG magnetic field. Also, we propose that the observed values are due to interaction effects and magnetoelastic coupling of particle magnetic moments and external magnetic field.
► Giant magnetostriction in iron oxide nanoparticles.
► A 4% relative change in dimension of the particle.
► Small angle X-ray scattering (SAXS) as a tool for magnetostriction.
► Magnetoelastic coupling between surface spins and external magnetic field.
► There is a surface structure–property relationship.
Journal: Materials Science and Engineering: B - Volume 177, Issue 1, 25 January 2012, Pages 14–18