Uncompensated Garnets: A Magnetic Semiconductor.
Abstract
Yttrium iron garnet (YIG) is a ferrimagnetic oxide, Y3Fe5O12 and a good insulator. When five to ten percent of the Y(3+) is replaced by Ca(2+), an uncompensated state exists. The resulting material has perturbed magnetic properties, semiconducting electrical properties with activation energies from 0.2 to 0.4 eV and resistivities as low as 300 ohms cm at room temperature, and modified optical properties. In the past year the conductivity studies have concentrated on the evolution of a high conduction state m samples that have been annealed in a reducing atmosphere. The reduction process introduces oxygen vacancies which should compensate the hole introduced by Ca(2+). The annealing is also observed to modify significantly the effective exchange constant of the material and the optical activity. These measurements are summarized in this report.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 09, 1995
- Accession Number
- ADA300800
Entities
People
- Philips E. Wigen
Organizations
- Ohio State University