Superparamagnetic and photoluminescence of nanohole-arrayed MnZn ferrite thin film on PAA/GaN/sapphire thin films

The nanohole-arrayed MnZn ferrite on the PAA/GaN/sapphire multilayer films was investigated for understanding the relation of the superparamagnetic with the photoluminescence. The nanohole MnZn ferrite film acts as a role of lowering superparamagnetic magnetization, and gives a way to excite the energy-exchanged yellow emission, especially at the presence of the sandwiched GaN layer. Without the GaN layer, the magnetic susceptibility increases and favors the excited blue emission arising from the oxygen vacancy defects.