Conversion of Anisotropically Phase-Segregated Pd/γ-Fe₂O₃ Nanoparticles into Exchange-Coupled fct-FePd/α-Fe Nanocomposite Magnets

Abstract

Exchange-coupled fct-FePd/alpha-Fe nanocomposite magnets were fabricated by converting anisotropically phase-segregated Pd/gamma-Fe2O3 nanoparticles via the interfacial atom diffusion. The magnetically hard fct-FePd phases formed by the interdiffusion between alpha-Fe and fcc-Pd phases nearly preserve their sizes at the nanometer scale because they are surrounded by the alpha-Fe matrix. The VSM measurements reveal that the exchange coupling between the soft and hard phases has been realized.

Textured anisotropic FePd/α-Fe nanocomposite foils by sheath repetitive cold-rolling

“…8 and 9). These magnetic property values are comparable to those ( 0 H c = 0.076 T; J s = 1.31 T) of isotropic FePd/␣-Fe nanoparticles fabricated by chemical selfassembly after annealed at 500 • C for 3 h[17]. Recent results from the chemical self-assembly approach showed that annealing temperatures of 450-500 • C for a long annealing time up to 48 h provided better magnetic properties for the isotropic FePd/␣-Fe nanoparticles.…”

Electrochemical performance of α-Fe2O3 nanorods as anode material for lithium-ion cells

“…Due to its low cost and the abundance of its raw materials in nature, Fe 2 O 3 has been widely investigated in many technological fields for applications such as energy materials for lithium ion storage, gas sensors, catalysts, and magnetic applications [1][2][3][4][5][6]. It is well known that the particle sizes and shapes of nanoscale materials affect their properties and potential applications.…”

Synthesis of α-Fe2O3 hexagons and their magnetic properties

“…Iron oxide and oxyhydroxide iron have been extensively used in the production of pigments, catalysts, gas sensors, magnetic recordings, and raw materials for hard and soft magnets [1][2][3][4][5][6][7]. Among the iron oxides, ␣-Fe 2 O 3 has the corundum structure, while ␥-Fe 2 O 3 and Fe 3 O 4 have the spinel structure.…”