Temperature dependence of the effective linewidth in porous and fine grain polycrystalline yttrium iron garnet

Author

Kaelberer, R.E. ; Patton, C.E.

Author_Institution

Colorado State University, Fort Collins, Colorado, USA.

Volume

13

Issue

5

fYear

1977

fDate

9/1/1977 12:00:00 AM

Firstpage

1230

Lastpage

1232

Abstract

Data on the temperature dependence of the off-resonance effective linewidth $\\Delta H_{eff}$ have been obtained at 9.94 GHz for porous and fine grained samples of polycrystalline YIG. The high field $\\Delta H_{eff}$ increases with decreasing temperature from 300K to 250K. From 250K to 100K, $\\Delta H_{eff}$ is constant. $\\Delta H_{eff}$ is linearly proportional to porosity, with about 0.4 Oe/%, which is superimposed on a porosity independent contribution which increases from a few tenths Oe at 300K to about 2.2 Oe below 250K. For samples with an average grain size aoof 3μ to $30\\mu, \\Delta H_{eff}$ is proportional to $a_{o}^{-1/2}$ at 300K and to $a_{o}^{-1}$ below 250K. These results are discussed in terms of a magnetostriction model and a spin-wave transit time model.

Keywords

Magnetic thermal factors; YIG materials/devices; Crystalline materials; Garnets; Grain size; Iron; Magnetic field measurement; Magnetic materials; Magnetostriction; Scattering; Temperature dependence; Yttrium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1977.1059673

Filename

1059673