Mesoscopic bar magnet based on ?-Fe2O3 hard ferrite.

ABSTRACT: Ferrite magnets have a long history. They are used in motors, magnetic fluids, drug delivery systems, etc. Herein we report a mesoscopic ferrite bar magnet based on rod-shaped ?-Fe2O3 with a large coercive field (>25?kOe). The ?-Fe2O3-based bar magnet is a single crystal with a single magnetic domain along the longitudinal direction. A wide frequency range spectroscopic study shows that the crystallographic a-axis of ?-Fe2O3, which corresponds to the longitudinal direction of the bar magnet, plays an important role in linear and non-linear magneto-optical transitions, phonon modes, and the magnon (Kittel mode). Due to its multiferroic property, a magnetic-responsive non-linear optical sheet is manufactured as an application using an ?-Fe2O3-based bar magnet, resin, and polyethylene terephthalate. Furthermore, from the viewpoint of the large coercive field property, we demonstrate that a mesoscopic ?-Fe2O3 bar magnet can be used as a magnetic force microscopy probe.

SUBMITTER: Ohkoshi S 

PROVIDER: S-EPMC4895237 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature