[15p-PB1-1~57] 10 Spintronics and Magnetics (Poster)

[15p-PB1-31] Magnetic Properties of Single-Crystalline Thin Films of High -Entropy Iron Garnet(Y_0.25La_0.25Lu_0.25Bi_0.25)₃Fe₅O₁₂

〇JIN MOCHIZUI¹, KENSUKE HAYASHI¹, SATOSHI IIHAMA¹, TAKAHIRO MORIYAMA¹ (1.Nagoya Univ.)

Keywords:

spintronics,high entropy,garnet

Magnons propagate through yttrium iron garnet (Y₃Fe₅O₁₂: YIG) withexhibit low attenuation since the magnetic damping constant of YIG is extremely small. It has been suggested that the smalllow damping is rooted in absence of magnetic moments in Yttrium atoms sitting in the dodecahedra site of the garnet structure. Thus, there have been investigations on the damping constant by the substituting the Yttrium with non-magnetic elements such as La, Lu, and Bi. However, Bi₃Fe₅O₁₂ and La₃Fe₅O₁₂, in which the Yttrium is fully substituted by Bi and La, are both thermodynamically unstable, making the synthesis of iron garnets containing large amounts of La and Bi challenging. One of the solutions for stabilizing the dodecahedra site substituted garnet is to increase configurational entropy in the dodecahedral sub-lattice by adding four non-magnetic elements: Y, La, Lu, and Bi. In this study, we have made single-crystalline films of the high entropy iron garnet (HE-IG) with a composition of[(Y_0.25La_0.25Lu_0.25Bi_0.25)₃Fe₅O₁₂:HE-IG], and investigated their magnetic properties.