Micromagnetic Simulations of Chaotic Ferromagnetic Nanofiber Networks

Abstract

Electrospinning can be used to create nanofibers with diameters of typically a few tens to a few hundred nanometers. While pure polymers are often electrospun, it is also possible to use polymer blends or to include nanoparticles. In this way, e.g., magnetic nanofiber networks can be created with a certain diameter distribution, random fiber orientations, and random crossing positions and angles. Here we present for the first time micromagnetic simulations of small parts of stochastically oriented nanofiber networks. Magnetization reversal mechanisms are investigated for different local spatial distributions; mutual influences of neighboring magnetic fibers due to dipolar interactions are depicted. This study serves as a base for the possible use of such stochastic nanofiber networks in the research area of neuro-inspired materials.

Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization

“…Fiber thickness was assumed as 120 nm, as according to the chosen part of a real magnetic nanofiber mat. Generally, the fiber thickness and thus the shape of the cross-section can be modified by a hot-pressing treatment [76]; this possibility was not further investigated here. The simulated hysteresis loops shown here were superposed of 7 hysteresis loops each, simulated for external magnetic field sweeps in the range of ±3000 Oe with the field axis applied along 0° (horizontal in Figure 1), 15°, … 90° (vertical in Figure 1).…”

Stochasticvs.deterministic magnetic coding in designed cylindrical nanowires for 3D magnetic networks

“…Additionally, it can act as a building block for nanowires networks. [12,20,[43][44][45] Similar systems have been suggested for bar coding, [46,47] ratchet memory devices [19,48] or 3D spin-transfer devices such as vertically coupled magnetic nano-scale oscillators, but without exploring the control over the vortex states. [11,12] Multifunctional magnetic/optical response can also be designed, e.g.…”

A review on electrospun magnetic nanomaterials: methods, properties and applications

“…This 'on'/'off' state could not only be used for data storage, but also as logic elements (such as AND or NAND) for neuromorphic computing. Blachowicz et al 288 further simulated the magnetisation reversal mechanisms under different local spatial distributions and mutual influences of neighbouring magnetic fibres. They found a tendency towards larger coercive fields as the NFs were distributed at a larger random angle range.…”

“…Of the work currently completed there has been a focus on simulating magnetic properties with respect to complex intra-and inter-fibre electrospun MNFs. Blachowicz et al 288 studied the influence of numbers and dimensions of contact points of electrospun NFs, and proposed a scheme to verify the mechanism. However, this application requires further investigation to enable widespread implementation.…”