High Field Linear Magnetoresistance Sensors with Perpendicular Anisotropy L10-FePt Reference Layer

• Published in: Advances in condensed matter physics Vol. 2016; no. 2016; pp. 1 - 6
• Main Authors: Quan, Z. Y., Wang, R., Song, Z. L., Liu, X.
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 2016; Hindawi Limited
• ISSN: 1687-8108; 1687-8124
• 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 L10-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 L10-FePt based sensor is significant for the expansion of linear range and the simplification of preparation for future high field magnetic sensors.