Synthesis of high magnetic moment CoFe nanoparticles via interfacial diffusion in core/shell structured Co/Fe nanoparticles

Abstract

We report the synthesis of high magnetic moment CoFe nanoparticles via the diffusion of Co and Fe in core/ shell structured Co/Fe nanoparticles. In an organic solution, Co nanoparticles were coated with a layer of Fe to form a Co/Fe core/shell structure. Further raising the solution temperature led to inter-diffusion of Co and Fe and formation of CoFe alloy nanoparticles. These nanoparticles have high saturation magnetization of up to 192 emu/g CoFe and can be further stabilized by thermal annealing at 600 °C.

Co3Fe7/C core–shell microspheres as a lightweight microwave absorbent

“…Clearly, S 500 possesses the smallest Ms value among the three samples. It is known that the Ms strongly depends on the chemical composition, and the Ms value of CoFe 2 O 4 is lower than that of Co 3 Fe 7 [34,35]. So compared with S 500 , the increasing Ms values of S 600 and S 700 are largely due to the increased proportion of the Co 3 Fe 7 phase, which is in agreement with the XRD results.…”

One-pot synthesis of high magnetization air-stable FeCo nanoparticles by modified polyol method

“…Similarly, magnetic labels for biosensor applications should possess high magnetic moments for efficient translocation of the functionalized labels to the specific sites on the sensor surface [6,7]. Thus, the quest for identifying suitable materials for the said purpose points towards the most feasible body centered cubic (bcc) FeCo magnetic nanoparticles due to their high saturation magnetization (Ms¼240 emu/g), high Curie temperature and permeability properties [8,9].…”

Comparative Study of Nanoparticles Fe 100−x Co x Alloy Synthesized by High Energy Ball Milling and by Polyol Process

“…Those alloys present also many performed properties such as high saturation magnetization , high Curie temperature, low coercivity, and high permeability. [2][3][4][5]. Thanks to these properties, FeCo alloys are used in various technical and industrial applications such as biomedical application, drug delivery, high density data storage, and microwave absorption [6][7][8].…”