Submicrometer hall sensors for superparamagnetic nanoparticle detection.
Submicrometer Hall sensors, with Hall cross width of {approx}250 nm, were fabricated from InAs/AlSb quantum well semiconductor heterostructures. The room-temperature device characteristics were examined by experimental Hall effect and electronic noise measurements combined with analytical calculations. The noise-equivalent magnetic moment resolution of the order of 104muB/radicHz was obtained at frequencies above {approx}1 kHz. We show that the devices can achieve single superparamagnetic nanoparticle detection and thus be employed in experiments involving single magnetically labeled biomolecule detection.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 915024
- Report Number(s):
- ANL/MSD/JA-59637; IEMGAQ; TRN: US200817%%68
- Journal Information:
- IEEE Trans. Magn., Vol. 43, Issue 6 ; Jun. 2007; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- ENGLISH
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