Optimisation of Spin-Valve Planar Hall Effect Sensors for Low Field Measurements

Autor:	Jenica Neamtu, Marius Volmer
Rok vydání:	2012
Předmět:	Magnetization Hysteresis Magnetic anisotropy Materials science Magnetoresistance Condensed matter physics Hall effect Spin valve Electrical and Electronic Engineering Magnetic hysteresis Electronic Optical and Magnetic Materials Magnetic field
Zdroj:	IEEE Transactions on Magnetics. 48:1577-1580
ISSN:	1941-0069 0018-9464
DOI:	10.1109/tmag.2011.2173671
Popis:	In this paper are presented results of galvanomagnetic measurements and micromagnetic simulations performed on low-field magnetic sensors based on the planar Hall effect (PHE). Disc-shaped structures of the type Co/Cu/Ni80Fe20, 4 mm diameter, deposited by magnetron sputtering onto Si substrate, were used to build magnetic sensors. At this stage of study, no uniaxial anisotropy axes were defined during the samples deposition. Two types of applications have been considered: (i) magnetic field measurements and (ii) rotation sensing. In order to obtain a coherent rotation of the magnetization inside the PHE sensor under the action of an applied magnetic field, Happl, DC or AC magnetic biasing fields were used. By these means the magnetic sensitivity and the hysteresis width of the PHE signal can be tuned. Sensitivities between 0.07 and 0.17 μV·A-1·m have been obtained for a driving current of 10 mA. Micromagnetic simulations were used to explain some field angular behavior of these sensors.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::04a3a65dc5733094f188e43d4273c9b5 https://doi.org/10.1109/tmag.2011.2173671 Zobrazit plný text záznamu