Large-area GMR bio-sensors based on reverse nucleation switching mechanism

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:473

Article; Proceedings Paper

Su, Diqing¹  Wu, Kai²  Wang, Jian-Ping² 

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

关键词: Large-area sensor;    Spin valve;    Reverse nucleation;    Magnetoresistance;    Biomarker detection;   

DOI  :  10.1016/j.jmmm.2018.10.112

来源: Elsevier

【 摘 要 】

In the past 20 years, several studies have been performed on the detection of biomarkers by the stripe-shaped spin valve sensors, whose sensitivity is limited by their small sensing area and large sensor resistance. In this paper, large-area spin valve sensors with lower aspect ratio are introduced. A reverse nucleation mechanism is proposed to demonstrate the different switching processes in large-area sensors. The simulation results further prove the involvement of reverse nucleation sites during the magnetization reversal. Large-area sensors also exhibit a linear response to the concentration of magnetic nanoparticles with a sensor signal more than 20 times larger than the stripe sensors.

【 授权许可】

Free