Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

Abstract

We synthesized Sm-Co/a-Fe nanocomposite film-magnets, approximately 10 lm in thickness, composed of 780 layers by the pulse laser deposition method. Transmission electron microscopic observations revealed that the synthesized film is composed of Sm-Co and a-Fe layers with the well-controlled a-Fe thickness of approximately 10-20 nm, which is suitable one predicted by the micromagnetic simulation. In spite of the enhanced interlayer diffusion of Fe and Co by annealing for crystallization, the (BH) max value of 100 kJ/m 3 was obtained at the averaged compositions of Sm/(Sm þ Co) ¼ 0.16 and Fe/(Sm þ Co þ Fe) ¼ 0.47. The a-Fe fraction for obtaining the highest (BH) max value was smaller than that expected from the micromagnetic simulation. Although the annealing for crystallization lay the easy direction of magnetization in the plane, the film is not expected to have strong crystallographic texture. V C 2014 AIP Publishing LLC. [http://dx

Formation of Fe–Co/glass multilayer films via pulsed laser deposition

“…Our group has proposed magnetic films that are thicker than several microns and applied them to miniaturized devices together with microelectromechanical system processes. [16][17][18][19][20][21][22] We then synthesized magnetic metal (or magnetic metal compound) laminated films with over 100 (approximately 10 μm in thickness) layers via pulsed laser deposition (PLD) using rotating composite targets, namely, Nd-Fe-B/α-Fe, 23,24) Sm-Co/α-Fe 25,26) and Pr-Fe-B/α-Fe. 27) Motivated by the above mentioned advances related to metal-ceramic laminated films, we prepare metal-ceramic multilayer thick-films in the present study.…”