Ferromagnetic liquid crystals for magnetic field visualisation

Rupnik, Peter; Lisjak, Darja; Čopič, Martin; Mertelj, Alenka

doi:10.1080/02678292.2015.1049570

Cited by 22 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2a ). This also explains why in experiments with ferrofluids or magnetic liquid crystals 16 – 18 , 30 , the samples became brighter (more transparent) but no colour could be observed, despite their high magnetic responsivity. Furthermore, it follows from the expression for the phase retardation that, to achieve δ ≥ 3 π at visible wavelengths, requires a sufficiently large product Δ nL .…”

Section: Discussionmentioning

confidence: 93%

Giant magneto-birefringence effect and tuneable colouration of 2D crystal suspensions

et al. 2020

View full text Add to dashboard Cite

One of the long-sought-after goals in light manipulation is tuning of transmitted interference colours. Previous approaches toward this goal include material chirality, strain and electric-field controls. Alternatively, colour control by magnetic field offers contactless, non-invasive and energy-free advantages but has remained elusive due to feeble magneto-birefringence in conventional transparent media. Here we demonstrate an anomalously large magneto-birefringence effect in transparent suspensions of magnetic two-dimensional crystals, which arises from a combination of a large Cotton-Mouton coefficient and relatively high magnetic saturation birefringence. The effect is orders of magnitude stronger than those previously demonstrated for transparent materials. The transmitted colours of the suspension can be continuously tuned over two-wavelength cycles by moderate magnetic fields below 0.8 T. The work opens a new avenue to tune transmitted colours, and can be further extended to other systems with artificially engineered magnetic birefringence.

show abstract

Section: Discussionmentioning

confidence: 93%

Giant magneto-birefringence effect and tuneable colouration of 2D crystal suspensions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The decrease of magnetic threshold in such LC suspensions is the result of magnetic properties of ferromagnetic particles only. The magneto-optical response of ferronematic LCs was also used as the principle of visualization of magnetic fields [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Spherical, Rod-Like and Chain-Like Magnetic Nanoparticles on Magneto-Optical Response of Nematics

et al. 2019

View full text Add to dashboard Cite

The effect of magnetic nanoparticles of low concentrations and different shapes, including spherical, rodlike, and chain-like shape on the magneto-optical response of nematic liquid crystal 6CHBT is investigated. The magneto-optical effect was examined using a linearly polarized laser beam (532 nm) passed through liquid crystal cell under both linearly increasing and pulsed magnetic fields. The analysis of observed magneto-optical characteristics and magneto-optical time responses confirmed the role of both concentration and shape of magnetic particles on the resultant magneto-optical behavior concerning both its stability and switching time.

show abstract

“…Based on ferrite nanoparticles new attractive magneto-responsive materials were developed, including ferromagnetic fluids (i.e. liquids exhibiting a spontaneous magnetic ordering, in contrast to superparamagnetic (SPM) ferrofluids) [29][30][31][32], magneto-optical suspensions and solid composites [33][34][35], soft magneto-electric [36], if we mention just a few. The acquired knowledge related to nanomagnetism, synthesis, and processing of the nanoparticles can also be crucial for the renaissance of most traditional applications of ferrites, i.e.…”

Section: The Importance Of Hexaferrite Magnetsmentioning

confidence: 99%

Topical Review: Progress and Prospects of Hard Hexaferrites for Permanent Magnet Applications

Fernández¹,

Sangregorio²,

Figuera³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Permanent magnets based on hard hexaferrite represent the largest family of magnets being used today by volume. They generate moderate remanence induction, but present crucial advantages in terms of availability, cost, resistance to demagnetization and corrosion and absence of eddy current losses. As a consequence, ferrites are the most logical candidate for substitution of rare-earths in selected applications that do not demand the best performing magnets. If the remanence of ferrite-based magnets was to be improved, even mildly, the door to a larger scale substitution could be opened. In this framework, we review here current strategies to improve the properties of hexaferrites for permanent magnet applications. We first discuss the potential of exploring the nanoscale. Second, progress related to controllably doping hexaferrites is revised. Third, results achieved by fabricating hard-soft magnetic composites using ferrites as the hard phase are presented. Finally, future prospects and new potential end applications for ferrite magnets are discussed.

show abstract

Ferromagnetic liquid crystals for magnetic field visualisation

Cited by 22 publications

References 16 publications

Giant magneto-birefringence effect and tuneable colouration of 2D crystal suspensions

Giant magneto-birefringence effect and tuneable colouration of 2D crystal suspensions

Effect of Spherical, Rod-Like and Chain-Like Magnetic Nanoparticles on Magneto-Optical Response of Nematics

Topical Review: Progress and Prospects of Hard Hexaferrites for Permanent Magnet Applications

Contact Info

Product

Resources

About