Soft Magnetic Hexagonal Ferrites for High Frequency Devices

摘要

The crystal structure and, electromagnetic properties of soft magnetic hexagonal ferrites for high frequency devices, and the practical use of Y and Z type ferrites are discussed. These X- and U type ferrites were successfully synthesized, and their electromagnetic properties were investigated. Soft magnetic hexagonal ferrites are promising for high frequency-magnetic materials because of their greater anisotropy field and higher resonance frequency. High initial permeability and resonance frequency are required for magnetic materials When, the average grain size decreases, the Q value increases in samples of Y- and Z-type, ferrites. The permeability of C_(02)Z ferrite was analyzed using two different magnetizing mechanisms When the grain size decreased the magnetization mechanism changed from domain wall motion to spin rotation magnetization. These ferrites have great practical potential for inductors, antennas, electromagnetic compatibility/electromagnetic interference. (EMC/EMI) filters and wave, absorbers. New markets for ferrites should open up when a low temperature ceramic co-firing (LTCC) process is established.