Magnetic Properties of Single Crystal CuNi-18H and MgZn-18H Solid Solutions.

摘要

Hexagonal ferrites have been under investigation at this laboratory for several years as both potential narrow and broad ferrimagnetic resonance linewidth materials for several device applications at microwave and millimeter wave frequencies. Recently a new 18-layer structure Ba5Me2Ti3Fe12O31 where Me=Zn, Mg, Co, and Cu was discovered and several compositions have been investigated. In this paper the magnetic properties of two solid solutions MgZn-18H and CuNI-18H have been investigated as a function of temperature. The CuNi system is of interest for two reasons: Attempts to obtain end member Ni containing crystals have been unsuccessful and Ni containing hexagonal ferrites exhibit small temperature coefficients of magnetization. The latter is an important property for device applications. The second reason relates to the influence of Cu(2+) ions in creating uniaxial anisotropy.