@article{oai:repo.qst.go.jp:00085565,
 author = {Hirota, Ryuichi and Murayama, Toru and Katsumi, Ryota and Kawawaki, Tokuhisa and Yabukami, Shin and Ryuji, Igarashi and Negishi, Yuichi and Kusakabe, Moriaki and Sekino, Masaki and Yatsui, Takashi and Kuwahata, Akihiro and Ryuji, Igarashi},
 issue = {8},
 journal = {IEEJ Transactions on Electrical and Electronic Engineering},
 month = {Apr},
 note = {Virus detection based on the nonlinear magnetic response of magnetic nanoparticles have been investigated, and magnetic detection methods using third harmonic have been widely applied because of high sensitivity, short measurement-time, and low cost. In this letter, we propose a virus detection method using the second harmonic signal to improve the signal intensity. Our results show that the signal to noise ratio, SNR, of the second harmonic is approximately three times higher than that of the third harmonic. A comparison of the ratio of the second harmonic to the fourth harmonic R24 and the ratio of the third harmonic to the fifth harmonic R35 shows that R24 is more sensitive in identifying changes in virus concentration. Our method has the potential to be used for rapid screening on virus detection.},
 title = {Virus Detection using Second Harmonics of Magnetic Nanoparticles},
 volume = {17},
 year = {2022}
}