Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 113: Organic Electronics and Photovoltaics: Devices (jointly with CPP, HL)

TT 113.1: Hauptvortrag

Freitag, 20. März 2015, 09:30–10:00, C 130

Strong and switchable magnetic couplings in molecular semiconductor films — •Michele Serri¹, Wei Wu^{1, 2}, Luke Fleet¹, Cyrus Hirjibehedin², Nicholas Harrison¹, Chris Kay², Andrew Fisher², Gabriel Aeppli², and Sandrine Heutz¹ — ¹London Centre for Nanotechnology, Imperial College London, UK — ²London Centre for Nanotechnology, University College London, UK

Polyaromatic molecular thin films are well established as alternative semiconductors, but their magnetic properties have received less attention. This presentation will focus on phthalocyanines (Pc), archetypal molecular semiconductors that can ligate spin-bearing transition metals at their centre. They can be processed as thin films and nanowires [1] from the vapour phase and crystallise as a range of polymorphs. This leads to the formation of spin chains, and may give rise to magnetic exchange whose sign and magnitude depends on the nature of the transition metal and crystal structure [2]. A recent milestone was reached by CoPc, which exhibits antiferromagnetic coupling, with an exchange energy reaching 100 K [3]. This interaction is up to two orders of magnitude larger than in other first-row transition metal Pcs and can be obtained on flexible plastic substrates.

[1] Wang et al. ACS Nano 4 (2010) 3921. [2] Heutz et al. Adv. Mater. 19 (2007) 3618. [3] Serri et al. Nat. Commun. 5 (2014) 3079.