Control method for the tunable ordered structures in magnetic fluid microstrips

Abstract

Structural evolution along the edges of magnetic fluid microstrips under external magnetic fields is investigated in this article. It was found that when the external magnetic field increased the structure evolves from an originally monodispersed state to a disordered column state, and then to several levels of ordered structures. For the ordered structure state, a one-dimensional periodic structure resulted under lower field strengths, and with an increase in field strength, more columns formed. Hence, a two-dimensional ordered array of columns was achieved. Further experimental results showed that the ordered structure can be manipulated by adjusting control parameters, such as field strength, sweep rate, fluid concentration, strip width, and strip thickness. These results lay the groundwork for utilizing controllable ordered structures in magnetic fluid microstrips to develop potential applications, such as photonic crystals or waveguides.

Tunable refractive index of magnetic fluids and its applications

“…But, the difference between saturated value and zero-field n MF becomes larger as φ increases from 1.21% to 1.93% of volume fraction. This is due to enhanced of phase separation in a magnetic fluid film with a higher concentration when an external field is applied [13]. Furthermore, as the concentration increases, the n MF -H curve moves to a region with higher refractive indices.…”

Tunable photonic crystals based on MnFe2O4 magnetic fluids by magnetic fields

“…For two-dimensional PCs simulations, these data should be modified so that the ordered structure is infinitely long. However, the structures and the refractive indices of the magnetic fluids under externally magnetic field simultaneously depend on many other parameters, such as the concentration of the magnetic fluids, the sweep rate of the magnetic fields and the sizes of the samples [14,22]. Therefore, these parameters can be optimized to meet the data listed in Table 1 for different samples.…”

“…into ordered column structure in the magnetic fluid [14][15][16]. These periodic column structure composed of magnetic nanoparticle aggregations is usually in hexagonal pattern, which is attributed to the condition of minimum total energy [17].…”

“…These periodic column structure composed of magnetic nanoparticle aggregations is usually in hexagonal pattern, which is attributed to the condition of minimum total energy [17]. The diameter of each column is usually around 1 m and the distance between the neighboring columns is about several micrometers [14,16]. A schematic illustration of the periodic column structure self-assembled in the presence of an externally magnetic field is shown in Fig.…”

Periodic structure of spicular magnetic clusters in a magnetic liquid

“…A number of works are devoted to the experimental investigation of formation and properties of ordered clusters in thin films of ML [5,[11][12][13][14]. Authors analyzed primarily the case of homogeneous external magnetic field applied perpendicularly to the surface of a film and clusters arranged like cylindrical magnetic domains in thin magnetic films in the nodes of two-dimensional hexagonal lattice.…”