Ultrathin molecule-based magnetic conductors: A step towards flexible electronics

Abstract

Organic-inorganic hybrid materials have shown a remarkable and rapid development during the past decade because they can be tailored to obtain new device concepts with controlled physical properties. Here, we report on the electronic and magnetic properties of multilayer organic-inorganic hybrid films. Electrical transport properties arising from the π electrons in the organic layer are characteristic of a metallic state at high temperature and evolve into a state described by two-dimensional variable range hopping when temperature decreases below 150 K. The intrinsic electronic behavior of the hybrid films was further studied via the optical properties in the IR range. The optical response confirms the metallic character of the hybrid films. In the second part, the magnetic properties are discussed. A long-range ferromagnetic order with an ordering temperature of ∼ 1 K is revealed in the Gd-based hybrid film. The Cu-based hybrid film, however, shows more extended ferromagnetic exchange interactions than the Gd-based hybrid LB film.

Intrinsic Magnetic Order of Chemically Exfoliated 2D Ruddlesden–Popper Organic–Inorganic Halide Perovskite Ultrathin Films

“…(C 6 H 5 C 2 H 4 NH 3 ) 2 CuCl 4 (for short, Cu-PEA) crystal was reported [26] to be a single phase multiferroic material which is polar below T c = 340 K and ferromagnetic (F) below 13 K. Compared with conventional inorganic oxide multiferroics such as BiFeO 3 and YMnO 3 , Cu-PEA is regarded as a new type of single phase multiferroic [27][28][29] and triggered the self-assembled organic-inorganic MCl 4 2− (M = Cu, Mn, Co) based perovskite films using Langmuir-Blodgett (LB) technique from a spintronic application point of view. [30][31][32][33] But, there is no magnetic property data on nanometer-thick ultrathin films and even in-plane remnant magnetization (3.1 × 10 −5 emu mm −2 ) of 1184-layer-thick CuCl 4 hybrid LB films at 3 K is very weak.…”