Abstract
Spin-electronics-based magnetic sensors, first developed for magnetic read heads, are now finding their way into many different technological devices from cars to medical systems. They combine very high sensitivity, great robustness, and very small size. Today they are integrated with CMOS electronics into a common process. In this chapter, we give an overview of that technology and describe some example applications, such as speed sensors, current sensors, and biomagnetic signal detection.
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Notes
- 1.
The strongest magnets we know are alloys of samarium and cobalt or of neodymium, iron, and boron. Samarium (Sm) and neodymium (Nd) are examples of rare earths, i.e., 4f elements of Mendeleev’s periodic table, and have become very expensive these days. Efforts are being made to do away with them in magnetic systems.
- 2.
The most common unit for the magnetic field strength is the tesla. The oersted (10\(^{-4}\)Â T) is often used for weak magnetic fields.
Reference
M. Pannetier-Lecœur, L. Parkkonen, N. Sergeeva-Chollet, H. Polovy, C. Fermon, C. Fowley, Magnetocardiography with sensors based on giant magnetoresistance. Appl. Phys. Lett. 98, 153705 (2011)
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Fermon, C. (2016). Applications II: The Secret Revolution of Magnetic Sensors. In: Lourtioz, JM., Lahmani, M., Dupas-Haeberlin, C., Hesto, P. (eds) Nanosciences and Nanotechnology. Springer, Cham. https://doi.org/10.1007/978-3-319-19360-1_4
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DOI: https://doi.org/10.1007/978-3-319-19360-1_4
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