Dependence of Ferromagnetic Resonance Linewidth on Structural Defects in Single Crystals of Lithium Ferrite
- 1 March 1967
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 38 (3), 1421-1422
- https://doi.org/10.1063/1.1709650
Abstract
Submicroscopic defects have been established as the major cause of linewidth in lithium ferrite single crystals. Over 100 highly polished lithium ferrite spheres showing no microscopic defects exhibited ΔH's ranging from 2 to 60 Oe. Spheres of low ΔH and high ΔH were chemically polished and etched. Low ΔH spheres had very few pits; high ΔH spheres were severely mottled and etched. X‐ray topography and etching of (111) plates have confirmed that regions with defects >105 cm−2 exist near regions of only 102 cm−2. The regions are often separated by a sharp boundary along 〈110〉. Spheres prepared from very low‐pit‐count material repeatedly had ΔH's of heat treatment. The defects appear to be dislocations and compositional variations. Heat treatment at 850°C caused no observable change in x‐ray topographs. By careful selection of the crystals of low defect content, ΔH's as low as 0.87 Oe at 5.1 GHz and 25°C have been observed.Keywords
This publication has 5 references indexed in Scilit:
- Properties of Single-Crystal Lithium Ferrite Grown in the Ordered StateJournal of Applied Physics, 1964
- Effect of Mechanical, Thermal, and Chemical Treatment of the Ferrimagnetic Resonance Linewidth on Lithium Ferrite CrystalsJournal of Applied Physics, 1962
- Ionic Ordering Effects in the Ferromagnetic Resonance of Lithium Ferrite MonocrystalsJournal of Applied Physics, 1960
- Studies of Individual Dislocations in Crystals by X-Ray Diffraction MicroradiographyJournal of Applied Physics, 1959
- Surface-Independent Spin-Wave Relaxation in Ferromagnetic Resonance of Yttrium Iron GarnetJournal of Applied Physics, 1959