Spin current nano-oscillator (SCNO) as a potential frequency-based, ultra-sensitive magnetic biosensor: a simulation study. (30th June 2020)

• Record Type: Journal Article
• Authors: Saha, Renata; Wu, Kai; Su, Diqing; Wang, Jian-Ping
• Is Part Of: Nanotechnology. Volume 31:Number 37(2020)
• Publication Date: 2020-06-30
• Subjects: spin current nano-oscillator (SCNO) -- magnetic nanoparticles (MNPs) -- single molecule sensitivity -- position sensitive behavior -- frequency-based nanobiosensor -- spintronic nanodevice -- target antibody-antigen-capture antibody-MNP complex; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab9921
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: This work is a micromagnetic simulation-based study on the GHz-frequency ferromagnetic resonances (FMR) for the detection of magnetic nanoparticles (MNPs) using spin current nano-oscillator (SCNO) operating in precession mode. Capture antibody-antigen-detection antibody-MNP complex on the SCNO surface generates magnetic fields that modify the FMR peaks and generate measurable resonance peak shifts. Moreover, our results strongly indicate the position-sensitive behavior of the SCNO biosensor and demonstrate ways to eradicate this effect to facilitate improved bio-sensing. Additionally, a study has been made on how MNPs with different sizes can alter the SCNO device performance. This simulation-based study on the SCNO device shows the feasibility of a frequency-based nano-biosensor with the sensitivity of detecting a single MNP, even in presence of background noise.