2D Magnetic Fe0.75Ta0.5S2: Giant Exchange Bias with Broadband Photoresponse. (13th October 2022)

• Record Type: Journal Article
• Authors: Li, Changcun; Wu, Jiazhen; Bian, Renji; Cao, Guiming; Pan, Er; Liu, Zhijun; Yu, Jiachen; Hosono, Hideo; Liu, Fucai
• Is Part Of: Advanced functional materials. Volume 32:Number 52(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-13
• Subjects: broadband photodetections -- exchange biases -- negative magnetoresistances -- ternary transition metal chalcogenides; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202208531
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Understanding the interplay between magnetic and optoelectronic properties and developing spin‐optoelectronic devices are promising research strategies to further study 2D materials and advance their applications. Here, the broadband photoresponse in the newly synthesized magnetic Fe0.75 Ta0.5 S2 single crystals is reported. Because the uncompensated magnetic moment of the spin glass state is pinned by the moment of the antiferromagnetic state, a large exchange bias field of ≈1.98 T is found at 2 K when cooled down at a field of 7 T. The as‐prepared samples show a large negative magnetoresistance (nMR). The field dependence of nMRs displays a similar trend up to 50 K, which is likely to originate from the significant dependence of the localization length on magnetic field. In addition, a photodetector prepared using Fe0.75 Ta0.5 S2 flakes exhibits a fast response time (121.7 ms), good stability, high responsivity of 26.1 A W −1, and broadband photodetection, showing application potentials in spin‐optoelectronics. Abstract : Exploring the interplay between magnetic and optoelectronic properties and developing spin‐optoelectronic devices are potential research strategies for further studies of 2D materials and their applications. A great exchange bias, intrinsic negative magnetoresistance, and broadband photodetection with fast response time and high responsivity are presented in the newly synthesized magnetic Fe0.75 Ta0.5 S2, demonstrating great potential for advanced magneto‐optoelectronic applications.