High field linear magnetoresistance sensors with perpendicular anisotropy [L1.sub.0]-FePt reference layer

• Published in: Advances in Condensed Matter Physics
• Main Authors: Liu, X, Song, Z.L, Wang, R, Quan, Z.Y
• Format: Journal Article
• Language: English
• Published: John Wiley & Sons, Inc 01.01.2016
• ISSN: 1687-8108
• DOI: 10.1155/2016/8528617

High field linear magnetoresistance is an important feature for magnetic sensors applied in magnetic levitating train and high field positioning measurements. Here, we investigate linear magnetoresistance in Pt/FePt/ZnO/Fe/Pt multilayer magnetic sensor, where FePt and Fe ferromagnetic layers exhibit out-of-plane and in-plane magnetic anisotropy, respectively. Perpendicular anisotropy [L1.sub.0]-FePt reference layer with large coercivity and high squareness ratio was obtained by in situ substrate heating. Linear magnetoresistance is observed in this sensor in a large range between +5 kOe and -5 kOe with the current parallel to the film plane. This [L1.sub.0]-FePt based sensor is significant for the expansion of linear range and the simplification of preparation for future high field magnetic sensors.