Anisotropy and magnetostriction of gallium-substituted yttrium iron garnet

Abstract

The anisotropy and magnetostriction constants of gallium‐substituted yttrium iron garnet single crystals of composition Y₃Fe_5−tGa_tO₁₂ with 0≤t≤1.5 have been investigated by means of ferrimagnetic resonance in the temperature range 4.2≤T≤500 K. From the concentration dependence at T =4.2 K the single‐ion contribution of the tetrahedral and octahedral anisotropy was found to be K_d = −0.0019 cm⁻¹ and K_a = −0.012 cm⁻¹, respectively. In the range t100/t = −1.3×10⁻⁶ and Δλ₁₁₁/t = +3.0×10⁻⁶ was found.