Microstructure analysis of a SmCo/Fe exchange spring bilayer

TitleMicrostructure analysis of a SmCo/Fe exchange spring bilayer
Publication TypeJournal Article
Year of Publication2008
AuthorsLiu YZ, Wu YQ, Kramer MJ, Choi Y, Jiang JS, Wang ZL, Liu JP
Journal TitleApplied Physics Letters
Date Published11/01
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberISI:000260944100060
Keywordschromium, cobalt alloys, diffusion, energy product, iron, MAGNETS, permanent-magnets, samarium alloys, sputtering, stoichiometry, transmission electron microscopy

The microstructure of a magnetron sputtered Cr(20 nm)/Sm-Co(20 nm)/Fe(20 nm)/Cr(5 nm) exchange spring magnet was studied using an advanced analytical transmission electron microscopy to better understand the relationship between its chemistry and structure to enhance the energy product. It is shown that the Fe atoms diffuse into the well textured Sm-Co layer, causing a transition from the stoichiometric Sm2Co7 near the Sm-Co/Cr interface to a defected Sm(Co,Fe)(5) in the Sm-Co-Fe intermixed area. The graded intermixed layer between Sm-Co and pure Fe gives rise to a compositionally enhanced energy product.

Alternate JournalAppl. Phys. Lett.