Thermal stability, oxidation behavior and magnetic properties of Fe–Co ultrafine particles prepared by hydrogen plasma–metal reaction

Electrical and magnetic properties of ε-Fe3N nanoparticles synthesized by chemical vapor condensation process

“…The metal nanoparticles have been synthesized by both physical [7][8][9] and chemical [10][11][12] techniques, usually, followed by a passivation process in an inert atmosphere with a small amount of oxygen to prevent further oxidization. The presences of nonmagnetic surfaces and the canting of moments in the oxide coating [13][14][15][16] have been found to be detrimental to the magnetic properties of the magnetic nanoparticles/ nanocapsules. Particularly, the oxide surface is known to play an important role on electrical transport properties of the metal nanoparticles.…”

A quasicore-shell structure of FeCo and FeNi nanoparticles

“…In many bimetallic systems, such as AuAg, AgNi, and AgCo, the nanoparticles can form a core-shell structure where the core of metal A is covered by a thin shell of metal B. [17][18][19][20][21][22][23][24][25][26][27][28] Nanometer-sized magnetic particles synthesized by highenergy ball-mill technique, 21 thermal decomposition, coprecipitation route, 27 hydrogen plasma-metal reaction etc., 17 have been demonstrated to possess an oxide shell, resulting in the difficulties in obtaining the element-specific information about the spatial distribution of Fe and Co ͑Ni͒ in these nanoparticles. 4-6 In particular, bimetallic transition metal nanoparticles are of great importance.…”

The hierarchical three-dimensional cobalt superstructure: Controllable synthesis, electromagnetic properties and microwave absorption

“…The saturation magnetization M s was smaller than that of the single-hcp cobalt (168 emu/g) [16]. The reduction in saturation magnetization for the cobalt superstructure is usually due to the formation of oxides on the particle's surface [24]. The coercivity H c was larger than that of bulk cobalt (10 Oe), resulting from particles size, magnetocrystalline and shape anisotropy.…”