Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles

Abstract

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Ferromagnetic L10-Structured CoPt Nanoparticles for Permanent Magnets and Low Pt-Based Catalysts

“…The addition of noble metals in CoPt, in contrast to the FePt, does not affect the ordering temperature significantly; however, Sb doping reduces the ordering temperature, but still, an annealing at 400 °C is required to reach a 1 kOe coercivity at room temperature . Similarly, addition of B leads to coercivities of 12 kOe at room temperature after annealing at 600 °C for 2 h, close to the value reported at 700 °C for 2 h in the binary system, effectively reducing the annealing temperature by 100 °C . Following a one-step solid-state methodology, Bian et al reported the synthesis of L1 0 CoPt nanoparticles which reveal 3.2 kOe coercive field after a 550 °C annealing, but the particles lose their uniformity and show a broad distribution of particle size in the range of 10–19 nm.…”

“…31 Similarly, addition of B leads to coercivities of 12 kOe at room temperature after annealing at 600 °C for 2 h, close to the value reported at 700 °C for 2 h in the binary system, effectively reducing the annealing temperature by 100 °C. 32 Following a one-step solid-state methodology, Bian et al 33 reported the synthesis of L1 0 CoPt nanoparticles which reveal 3.2 kOe coercive field after a 550 °C annealing, but the particles lose their uniformity and show a broad distribution of particle size in the range of 10−19 nm. Very recently L1 0 CoPt nanoparticles were synthesized via pyrolysis of metallopolymer precursors at 800 °C.…”

Smallest Bimetallic CoPt3 Superparamagnetic Nanoparticles

“…Despite this thin surface layer, these small CoPt 3 NPs exhibit superparamagnetic behavior with a blocking temperature near 20 K and coercivity at 10 K of 27.9 kA m −1 (∼0.035 T, 350 Oe), which is in agreement with previous reports for similarly nanosized CoPt 3 particles. 51,52 However, there is also evidence of a second magnetic phase in the ZFC curve, possibly a small amount (∼4%) of CoO on the NP surface. This can, in fact, strongly enhance the magnetization compared with other reported NPs without significantly affecting their superparamagnetism.…”

Nanomagnetic CoPt truncated octahedrons: facile synthesis, superior electrocatalytic activity and stability for methanol oxidation

“…It has been well known that magnetic CoPt materials including CoPt NPs and thin films have a broad range of applications in recording media [20,21] and magnetic sensor [22]. Therefore, CoPt NPs are a good candidate to investigate the relationship between the magnetism and catalysis.…”