2020/08/02 by J. X. Hu, Junxiong Hu, Jian Gou +21
Materials Science · Physics and Astronomy · #2D Materials and Applications #Colossal magnetoresistance #Electronic and Structural Properties of Oxides #Graphene #Graphene research and applications #Layer (electronics) #Magnetic field #Magnetoresistance #Materials science #Nanoscopic scale #Nanotechnology #Optoelectronics #Oxide #Substrate (aquarium) #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1002/adma.202002201
published as Advanced Materials 32, 2002201 (2020) · 64 pages; Main 31 pages, 4 figures; Supplementary 33 pages, 18 figures
openalex publication_date 2020/08/02 · arxiv created 2021/01/19 · arxiv updated 2021/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Disorder‐induced magnetoresistance (MR) effect is quadratic at low perpendicular magnetic fields and linear at high fields. This effect is technologically appealing, especially in 2D materials such as graphene, since it offers potential applications in magnetic sensors with nanoscale spatial resolution. However, it is a great challenge to realize a graphene magnetic sensor based on this effect because of the difficulty in controlling the spatial distribution of disorder and enhancing the MR sensitivity in the single‐layer regime. Here, a room‐temperature colossal MR of up to 5000% at 9 T is reported in terraced single‐layer graphene. By laminating single‐layer graphene on a terraced substrate, such as TiO 2 ‐terminated SrTiO 3 , a universal one order of magnitude enhancement in the MR compared to conventional single‐layer graphene devices is demonstrated. Strikingly, a colossal MR of >1000% is also achieved in the terraced graphene even at a high carrier density of ≈10 12 cm −2 . Systematic studies of the MR of single‐layer graphene on various oxide‐ and non‐oxide‐based terraced surfaces demonstrate that the terraced structure is the dominant factor driving the MR enhancement. The results open a new route for tailoring the physical property of 2D materials by engineering the strain through a terraced substrate.