Magnetic materials with a high self-biased ferromagnetic resonance (FMR) frequency and low electrical conductivity hold great potential for RF/microwave devices. In this work, ferrite film consisting of Fe3O4 (1.2 mu m)/photoresist (60 nm)/Fe3O4 (1.2 mu m) was deposited at 90 degrees C via spin spray deposition. Broadband impedance imaging with nanometer spatial resolution was recorded by using scanning microwave microscopy. Compared to a reference sample, it turned out that the grain boundary appeared to be more conductive than the grain.
Sun, N. X.,
& Zhuang, Y.
(2012). Excessive Grain Boundary Conductivity of Spin-Spray Deposited Ferrite/Non-Magnetic Multilayer. Journal of Applied Physics, 111 (7), 07A512.