Amorphous Slater-Pauling like behaviour in magnetic nanoparticles alloys synthesized in liquids

Abstract

On the influence of nanometer-thin antiferromagnetic surface layer on ferromagnetic CrO2 J. Appl. Phys. 112, 053921 (2012) Thermal stability and the magnetic properties of hybrid vanadium oxide-tetradecylamine nanotubes J. Appl. Phys. 112, 053912 (2012) Nanostructured thin manganite films in megagauss magnetic field Appl. Phys. Lett. 101, 092407 (2012) Reversal mechanisms of coupled bi-component magnetic nanostructures Appl. Phys. Lett. 101, 083112 (2012) Formation mechanism, optical and magneto-dielectric studies of new cubic spinel MgMnO3 AIP Advances 2, 032140 (2012) Additional information on J. Appl. Phys.Nanoparticles of Fe, Co, Ni, and their alloys, with an average diameter of 12 nm were synthesized in liquids using a laser. Their saturation magnetization exhibited a Slater-Pauling-like behaviour with two main differences compared to that expected in bulk materials. First, the amplitude of the magnetization was found to be roughly 5 times smaller. Second, the disappearance of the ferromagnetic (FM) behaviour occurred at Ni instead of the expected Ni 0.6 Cu 0.4 . The behaviour can be explained by the presence of non-magnetic oxidized shells which reduced the fraction of ferromagnetic atoms and induce through strain an amorphous structure in the metallic core. Annealing at 500 K leads to some crystallization of the particles and thus to a partial recovery of the expected magnetization. V C 2012 American Institute of Physics. [http://dx.

Stability of metastable phase and soft magnetic properties of bulk Fe-B nano-eutectic alloy prepared by undercooling solidification combined with CU-mold chilling

“…It is widely applied in aerospace, telecommunications and electricity, electronics and other fields. Recently, the bulk nano-crystalline materials as the excellent soft magnetic materials have been paid much attention due to the unique structure characteristics having quantum size effect, super para-magnetism and magnetic orderly particles of small size effect [1][2][3]. However, the stability and preparation of bulk nanocrystalline alloys have become main factors for the soft magnetic properties improving and application fields widening.…”