A high-bandwidth spintronic position sensor.
Nanotechnology
; 25(37): 375501, 2014 Sep 19.
Article
em En
| MEDLINE
| ID: mdl-25148257
ABSTRACT
Position sensing with resolution down to the scale of a single atom is of key importance in nanoscale science and engineering. However, only optical-sensing methods are currently capable of non-contact sensing at such resolution over a high bandwidth. Here, we report a new non-contact, non-optical position-sensing concept based on detecting changes in a high-gradient magnetic field of a microscale magnetic dipole by means of spintronic sensors. Experimental measurements show a sensitivity of up to 40 Ω/µm, a linear range greater than 10 µm and a noise floor of 0.5 pm/â[Hz]. Also shown is the use of the sensor for position measurements for closed-loop control of a high-speed atomic force microscope with a frame rate of more than 1 frame/s.
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MEDLINE
Idioma:
En
Ano de publicação:
2014
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Article