Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.12: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Study of hysteresis phenomena in spin crossover systems — •Raluca-Maria Stan, Roxana Gaina, and Cristian Enachescu — Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
Spin transition molecular magnets are inorganic compounds, commutable between two states in thermodynamic competition: the low spin state (LS) and the high spin state (HS). When the intermolecular interactions are larger than a threshold, the commutation is accompanied by various hysteresis, such as thermal, light induced or pressure hysteresis, property at the base of applications for information storage and numerical display. Here we shall study the thermal hysteresis (TH) and light induced thermal hysteresis (LITH) in the case of Fe(bbtr)3(ClO4)2 spin crossover compound. While the TH obtained at higher temperature (above 100K) is rate-independent, the LITH, obtained at low temperatures while irradiating the compound with a laser beam, shows a strong rate dependence (kinetic effects). Using the First Order Reversal Curves (FORC) method, which is well known for its capacity to provide information about the intrinsic properties of compounds showing hysteresis, we have qualitatively analyzed the kinetic effects. Then, in order to obtain a further quantitative analysis of the phenomena, the Mean Field model was used to simulate the observed behavior and an algorithm to disentangle between the static and dynamical effects in LITH was proposed.