Ferromagnetic resonance linewidth mechanism of Sr–Sn substituting YIG ferrite

Yttrium iron garnet (YIG) ferrite has become an important microwave magnetic material due to its superior magnetic and wide range of applications. Sr–Sn substituted Y 3− x Sr x Fe 5− x Sn x O 12 ( x = 0.02–0.3) ferrite produced by solid-state reaction method. The phase, microstructure and magnetic properties of the powders were analyzed. The actual data explains the relative influence of Sr–Sn doping on A–d exchange and grain growth. This paper quote double magneton scattering theory to give the polycrystalline linewidth composing of anisotropy linewidth Δ H a and porosity linewidth Δ H p . The theoretical change of the line width is obtained, and the close relationship between the line width and related factors is verified. The sample of Y 2.85 Sr 0.15 Fe 4.85 Sn 0.15 O 12 shows excellent properties which are 4πM s = 1953 Gs, Δ H = 32 Oe.