Spinel-based oxides containing magnesium, aluminum and titanium and methods of forming articles having same

A composite article comprising:

• a magnetic portion comprising nickel zinc ferrite;
• and
• a non-magnetic portion comprising a solid solution comprising MgAl2O4 and Mg2TiO4, the solid solution having a spinel crystal structure and a ratio of magnesium (Mg):
• aluminum (Al):
• titanium (Ti) that is represented as (2−x):(2x):(1−x) and 0<x<1.

A radio frequency (RF) circulator comprising:

• a disk-shaped magnetic portion;
• and
• a non-magnetic portion surrounding the disk-shaped magnetic portion, the non-magnetic portion comprising a spinel-structured oxide comprising MgAl2O4 and Mg2TiO4, the spinel-structured oxide having a ratio of magnesium (Mg):
• aluminum (Al):
• titanium (Ti) that is represented as (2−x):(2x):(1−x) and 0<x<1.