Abstract
A number of garnets including yttrium garnet, Y3Fe5O12, and mixed garnets of the forms (Y1−αSmα)3Fe5O12 and (Y1−βGdβ)3Fe5O12 have been prepared. X-band ferromagnetic resonance and saturation magnetization have been measured as a function of temperature. At room temperature samarium substitution for yttrium produces an approximately linear increase of line width with samarium content with practically no change in magnetization. Gadolinium substitution, on the other hand, has a much smaller effect on line width but produces an approximately linear decrease in saturation magnetization. Possible microwave application of these materials are discussed.
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