Spin transition in a magnetic Langmuir-Blodgett film
1988; Elsevier BV; Volume: 160; Issue: 1-2 Linguagem: Inglês
10.1016/0040-6090(88)90052-1
ISSN1879-2731
AutoresA. Ruaudel‐Teixier, A. Barraud, P. Coronel, O. Kahn,
Tópico(s)Nonlinear Dynamics and Pattern Formation
ResumoThermal equilibria between electron spin states of different multiplicities are studied in magnetic Langmuir-Blodgett (LB) films of amphiphilic FeII(phen)2 (NCS)2. Three aliphatic chains 18 carbon atoms long are grafted on the phenanthroline moiety and good LB films are obtained on CaF2 and quartz substrates. A temperature-induced spin transition is observed between liquid nitrogen and room temperatures. This transition is characterized in the IR spectral absorption by a 40 cm-1 frequency up shift of the vNCS doublet when changing from high spin to low spin ground state. From these preliminary experiments it appears that the spin transition still takes place in a two-dimensional system as it does in the same non-amphilic complex in three-dimensional single crystal form, as described by König.
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