Magneto-optični odziv feromagnetnega ferofluida v tanki kapilari

Jan, Domen (author), Mertelj, Alenka (mentor)

Feromagnetni ferofluid je poseben tip tekočine, ki ohranja feromagnetne lastnosti tudi v odsotnosti magnetnega polja. V sklopu magistrske naloge sem preučeval odziv suspenzije feromagnetnega ferofluida na motnjo povzročeno z magnetnim poljem. Spreminjanje napetosti na tuljavi je povzročalo spremembe v urejenosti feromagnetnih ploščic v suspenziji. Spremembe urejenosti je mogoče preučevati z optičnim polarizacijskim mikroskopom, ker so suspenzije v nematski fazi dvolomne. Eksperimenti so bili izvedeni v prisotnosti zemeljskega polja in ob izničenju zemeljskega magnetnega polja.

• Language: Slovenian
• Keywords: feromagnetni ferofluidi, dvolomnost, izotropna faza, nematska faza
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2025
• PID: 20.500.12556/RUL-168868
• COBISS.SI-ID: 232845059
• Publication date in RUL: 02.05.2025

Secondary language

• Language: English
• Title: Magneto-optical response of ferromagnetic ferrofluid in thin capillaries

Abstract

Ferromagnetic ferrofluid is a special type of liquid that retains ferromagnetic properties even in the absence of magnetic field. As part of this master's thesis, I investigated the response of a suspension of ferromagnetic ferrofluid to a disturbance caused by magnetic field. Changing the voltage on the coil caused the changes in arrangement of the ferromagnetic particles in the suspension. Because the suspensions in the nematic phase are birefringent, it was possible to study the the changes in magnetic ordering by polarized optical microscope. Experiments were first conducted in the presence of the Earth's field and in zero field condition in which the Earth's magnetic field was compensated.

• Keywords: ferromagnetic ferrofluids, birefringence, isotropic phase, nematic phase