current sensor

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	INESC MN	Microsistemas & Nanotecnologias

Current sensors based on magnetoresistive devices

Main Results

INESC-MN has been collaborating with Univ.Valencia for the fabrication of Wheatstone bridge sensors based on magnetoresistive elements, for current monitoring. Several chips were fabricated at INESC-MN (wafer deposition, microfabrication and chip encapsulation), using spin valves and magnetic tunnel junctions. The final chips are then tested in the Univ.Valencia,

sensor

Projects and Collaborations 2004 - present

Portuguese-Spanish integrated Actions Ref.: E-71/04, Univ.Valencia (Spain), (2004)

Joint Publications:

C. Reig, D. Ramírez, F. Silva, J. Bernardo, P. Freitas. “Design, fabrication and analysis of a spin-valve based current sensor”. Sensors and Actuators A-Physical 115 (2004) 259–266
J. Pelegrí, D. Ramírez, P. J. P. Freitas, W. Ku. A novel spin-valve bridge sensor for current sensing”. IEEE Trans. on Instrumentation and Measurement, vol. 53, nº 3, (2004) pp. 877-880.
C. Reig, D. Ramírez, H.H. Li, P. Freitas. “Low current sensing with specular spin valve structures”. IEE Proceedings-Circuits Devices and Systems 152 (2005) 307–311
C. Reig, D. Ramírez, S. Cardoso, P. Freitas. “GMR based full bridge sensor for low current sensing”. Eurosensors XIX. Barcelona (Spain, 2005)
C. Reig, M.D. Cubells-Beltrán, D. Ramírez, S. Cardoso, P.P. Freitas. “Electrical Isolators Based on Tunneling Magnetoresistance Technology”. IEEE Transactions on Magnetics 44 (2008) 4011–4014
M.D. Cubells-Beltrán, C. Reig, D. Ramírez, S. Cardoso, P.P. Freitas. “Full Wheatstone bridge spin-valve based sensors for IC currents monitoring”. IEEE Sensors Journals 9 (2009) 1756–1762
M. D. Cubells-Beltrán, C. Reig, D. Ramírez, S. Cardoso, P. P. Freitas. 2D FEM model for integrated GMR current sensors”. ICST 2010 (2010)
C. Reig, M.D. Cubells, D.Ramírez, A. Roldán, J.B. Roldán, S. Cardoso, P.P. Freitas. “GMR Current Sensors for IC applications”. Ibernam 2009. Sevilla (Spain, 2009)
"A Non-Invasive Thermal Drift Compensation Technique Applied to A Spin-Valve Magnetoresistive Current Sensor", J. Sánchez, D. Ramírez, S. Cardoso, S. Casans, A. Edith Navarro, P. J. P. de Freitas, Sensors (2011), 11, 2447-2458.