Magnetic Properties of NiCuZn Ferrite Thin Films Prepared by the Sol-gel Method

Ni0.4Cu0.2Zn0.4Fe2O4 thin films were fabricated on Si substrates by using the sol-gel method and rapid thermal annealing （RTA）, and their magnetic properties and crystalline structures were investigated. The samples calcined at and above 600 ℃ have a single-phase spinel structure and the average grain size of the sample calcined at 600 ℃ is about 20 nm. The initial permeability μi, saturation magnetization M and coercivity H of the samples increase with the increasing calcination temperature. The sample calcined at 600 ℃ exhibits an excellent soft magnetic performance, which has μi=33.97 （10 MHz）, Hc=15.62 Oe and Ms=228.877 emu/cm^3. Low-temperature annealing can enhance the magnetic properties of the samples. The work shows that using the sol-gel method in conjunction with RTA is a promising way to fabricate integrated thin-film devices.

Magnetic properties of NiCuZn ferrite thin films prepared by the sol-gel method

Ni_0.4Cu_0.2Zn_0.4Fe₂O₄ thin films were fabricated on Si substrates by using the sol-gel method and rapid thermal annealing (RTA), and their magnetic properties and crystalline structures were investigated. The samples calcined at and above 600 °C have a single-phase spinel structure and the average grain size of the sample calcined at 600°C is about 20 nm. The initial permeability μ _i , saturation magnetization M _s and coercivity H _c of the samples increase with the increasing calcination temperature. The sample calcined at 600°C exhibits an excellent soft magnetic performance, which has μ _i =33.97 (10 MHz), H _c=15.62 Oe and M _s=228.877 emu/cm³. Low-temperature annealing can enhance the magnetic properties of the samples. The work shows that using the sol-gel method in conjunction with RTA is a promising way to fabricate integrated thin-film devices. Funded by the National Natural Science Foundation of China (No. 90607021).