Effect of Nonmagnetic Inclusions on the Spin-Wave Linewidth in Polycrystalline YIG

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Abstract
Nonmagnetic second‐phase inclusions of two different average sizes (2.5 ± 0.5 and 1.2 ± 0.5 μ m) were produced in specimens of polycrystalline YIG. A dependence of spin‐wave linewidth on inclusion size was observed. The linear relationship between spin‐wave linewidth and the concentration of second‐phase inclusions was dependent on the wave vector k. At k ≈ 2 × 105 cm−1, the relationship was 0.15 Oe and 0.075 Oe per % second‐phase concentration for the samples with the smaller and larger inclusions, respectively. It is suggested that in porous specimens the average size of the pores may affect the spin‐wave linewidth and that this effect is similar to the transit‐time effect produced by finite grain sizes.