Magnetic exchange coupling and photodetection multifunction characteristics of an MnSe/LaMnO3 heterostructure

Abstract

Artificial heterostructures are often realized by stacking different materials to present new emerging properties that are not exhibited by their individual constituents. In this work, non-layered two-dimensional α-MnSe nanosheets were transferred onto LaMnO₃ (LMO) films to obtain a multifunctional heterostructure. The high crystal quality of the MnSe/LMO heterostructure was revealed by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy measurements. The enhancement of the saturated magnetization and coercive field and synchrotron X-ray measurements indicated the magnetic exchange coupling effect present in this MnSe/LMO heterostructure. The exchange bias field and coercive field reached 400 Oe and 1013 Oe under a positive 5k Oe field-cooling process. Thus, an outstanding photodetector with photoresponsivity of 4.1 × 10⁻⁴ A W⁻¹ and photo detectivity of 2.6 × 10⁸ jones was obtained with a luminescence of 532 nm for this MnSe/LMO heterostructure. The multifunction characteristics of magnetic exchange coupling and photodetection in this heterostructure are very useful for next-generation devices.