Enhanced magnetocrystalline anisotropy in an ultra-dense array of air-exposed crystalline cobalt nanowires

Abstract

202406-2Camara et al.

Consolidation of cobalt nanorods: A new route for rare-earth free nanostructured permanent magnets

“…0.59 T in this case. Coercivity values higher than this critical value have already be obtained by decreasing the particle diameter using organometallic route [22,42] or polyol route [19] or by improving the NR shape as well [43].…”

“…The coercivity of cobalt NRs is strongly dependent on their size, shape and crystalline structure [19,20]. Several groups worldwide have recently measured relatively high coercivity on single-crystalline hcp cobalt rods and wires prepared following polyol process and organometallic approaches [21,22].…”

Broadband electron paramagnetic resonance of a molecular spin triangle

“…Such design has been used successfully for broadband ferromagnetic measurements. 8,20,21 Microwave generation and detection An Anritsu MG3695C signal generator is used to produce a continuous-wave microwave signal with a frequency between 8 MHz and 50 GHz. The microwave signal transmitted through the CPW is rectified by a Herotek DZR50024 zero-bias Schottky diode.…”

From soft chemistry to 2D and 3D nanowire arrays with hard magnetic properties and permanent magnet applications

“…Along this direction, coercive fields of 0.35 T and 0.63 T at 300K and 4K respectively are measured for packing fraction of 0.38. Ferromagnetic resonance and magnetic torque measurements have evidenced values of magnetocrystalline anisotropy constants K1 and K2 of more than 40% higher than the ones of Co hcp bulk, possibly due to the surface anisotropy [41].…”