Energy-harvesting and mass sensor performances of magnetostrictive cobalt ferrite-spattered Fe–Co alloy plate
Hiroki Kurita, Siti Masturah binti Fakhruddin, Kumi Y. Inoue, Takeru Nakaki, Shotaro Kuroda, Zhenjin Wang, Wakako Araki, Hitoshi Shiku, Fumio Narita
Abstract
We recently reported that combining positive and negative magnetostrictive plates [iron-cobalt (Fe–Co) alloy and nickel (Ni) (i.e. Fe–Co/Ni) clad plates] yields remarkable energy-harvesting and mass sensor performances. Therefore, in this study, cobalt ferrite (CoFe 2 O 4 ), which has higher negative magnetostrictive properties than Ni, was spattered onto a Fe–Co alloy plate. The CoFe 2 O 4 -spattered Fe–Co alloy plate provided higher energy-harvesting and mass sensor performances than the Fe–Co/Ni clad plate. Moreover, the CoFe 2 O 4 -spattered Fe–Co alloy plate successfully transmitted the electrical signal to the receiver, and the output voltage of the CoFe 2 O 4 -spattered Fe–Co alloy plate was significantly changed by the adhesion of microgram silica particles. The CoFe 2 O 4 -spattered Fe–Co alloy plate has a considerable value as a self-powered mass sensor, which may be significant for the development of battery-free virus sensors.