Patent ID: 7758766

Claim:
A magnetic garnet single crystal represented by a chemical formula Bi α Na β M1 3-α-β-γ M2 γ Fe 5-δ-ε Mg δ M3 ε O 12 , wherein M1 is at least one element or more selected from Y, Eu, Gd, Tb, Dy, Ho, Yb and Lu, M2 is at least one element or more selected from Ca and Sr, M3 is at least one element or more selected from Si, Ge, Ti, Pt, Ru, Sn, Hf and Zr, 0.60<α≦1.50, 1.35<3−α−β−γ<2.40, 0≦γ≦0.10, 0≦δ≦0.10, 0<ε≦0.10, 0<γ+δ≦0.10, and 0<δ+ε≦0.10.