Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 102: Organic electronics and photovoltaics: Devices (CPP with HL/TT)
HL 102.1: Invited Talk
Friday, March 20, 2015, 09:30–10:00, C 130
Strong and switchable magnetic couplings in molecular semiconductor films — •Michele Serri1, Wei Wu1, 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.