Ultrathin molecule-based magnetic conductors: A step towards flexible electronics
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.464
Ultrathin molecule-based magnetic conductors: A step towards flexible electronics Naureen Akhtar1, Michiel C. Donker2, Tenzin Kunsel1, Paul H. M. van Loosdrecht3, Thomas T.M. Palstra1, and Petra Rudolf1 1 Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
2
KBM Master Alloys, Kloosterlaan 2, 9936 TE FARMSUM, The Netherlands
3
Physics Institute II, University of Cologne, Köln 50937, Germany.
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.
INTRODUCTION: Conventional electronics rely on the use of inorganic materials because they exhibit a wide range of robust electronic and magnetic properties along with their thermal and
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mechanical stability [1]. However, such electronic devices involve expensive processing and fabrication. Organic materials, on the other hand, have received considerable attention as being inexpensive, flexible, wearable (e.g., rollable TV screens, solar cells etc.), clean and renewable energy sources [2-5]. Significant progress has been made in the development of a new generation of electronic devices and the first commercial products such as full-color organic light emitting diode display or electronic paper are already available on the market. Organic-inorganic hybrids represent a new class of smart materials that could benefit from the best of both organics and inorganics [6-8]. Such materials can be prepared through self-assembly, intercalation, or grafting and are capable of providing co-existent multiple functionalities in one system that are difficult or impossible to achieve in a continuous lattice. One such example is a molecular material where conductivity or superconductivity is coupled with magnetism [9]. Over the
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