An Evaluation and Preparation of Ferromagnetic Liquid Composites for Use at Millimeter Wavelengths.
Abstract
Magnetic materials consisting of ferrofluids and ferrofluid composites i.e. mixtures of ferrofluid with metallic tin or non-metallic polystyrene or glass particles (0.2 micron to 25 micron diameter) have been prepared and studied. The samples in the form of thin films 1 to 10 micron thick have been examined using magnetic measurements and optical and microwave techniques. The measurements indicate that the films have (1) a magnetic anisotropy with a 30% reduction in magnetization with the plane of the film perpendicular to the field direction (2) a birefringence at both optical and microwave frequencies. Particle conformations in the presence of a magnetic field have also been studied and related to theory which gives the effective diamagnetic magnetic moment/particle approx. = 10 to the minus 9th - 10 to the minus 10th power emu. Additional keywords: Magnetooptics, Magnetic properties, Composite colloids, Optical birefringence measurement and Diffraction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1984
- Accession Number
- ADA153939
Entities
People
- J. P. Llewellyn
- J. Popplewell
- K. O'grady
- P. Davies
Organizations
- Bangor University