Šiame darbe tiriamos skystojo kristalo su integruotomis kobalto nanodalelėmis optinės savybės. Panaudotos medžiagos: skystasis kristalas 5CB (penkiakomponentis cianobifenilas) ir kobalto nanodalelės kurių dydis 10nm. Tiriami pavyzdėliai su skirtingomis kobalto koncetracijomis (0,05%, 0,092%, 1,04%) skystajame kristale. Išmatuoti sugerties ir LD intensyvumo spektrai bangų ruože nuo 250 iki 700nm. / In this work I studied optical and manetooptical features of liquid crystal (LC) with integrated magnetic particles in magnetic field. I observed three different samples of LC with cobalt nanoparticles. Samples were made of LC pentyl-cyanobifenyl (5CB) and ferromagnetic (cobalt) particles of about 10nm. Each sample has a different concentration of cobalt nanoparticles (0,05%, 0,092%, 1,04%). All observations were made with Perkin-Elmer UV-VIS-NIR lambda 19 and Jasco spectrometer at room temperature and wavelength ranges from 250 to 700nm. My results show that low magnetic field till 0,2T is required to change cobalt-LC suspension optical features. Shift to IR region a: 17nm, 28nm and 31nm depending from cobalt concentration are detected. Different magnetic field makes unequal influence to samples with various concentrations of cobalt nanoparticles. From experiment I found that increasing of magnetic field till 0,2T, it shifts the absorption line to longer wavelength. From results follows that the magnetically controlled optical characteristic is very promising for magnetically controlled LC devices and information processing.Pavel Cyganok Magnetooptical features of flexible system, nanoparticle – liquid crystal.