Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5491047 | Journal of Magnetism and Magnetic Materials | 2017 | 14 Pages |
Abstract
Micromagnetic simulation for detecting magnetic nanobeads is performed by using spin torque oscillation as the detector. The non-uniform stray field generated by magnetic beads can induce a detectable frequency shift of a spin torque oscillator. Simulations indicate that an 80-nm-diameter magnetic bead can be detected with a frequency shift of 1.2Â GHz and a maximum linewidth of 28Â MHz. Due to the non-uniform stray field, the frequency shift and linewidth vary with the bead position. For multiple beads detection, the oscillation frequency is linear with the number of 40-nm-diameter beads, namely 0.16Â GHz/bead on average.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Haiyan Xia, Qi Zheng, Congpu Mu, Chenkun Song, Chendong Jin, Qingfang Liu, Jianbo Wang,