Reversible Control by Light of the High‐Spin Low‐Spin Elastic Interface inside the Bistable Region of a Robust Spin‐Transition Single Crystal. Issue 5 (6th January 2016)

• Record Type: Journal Article
• Authors: Sy, Mouhamadou; Garrot, Damien; Slimani, Ahmed; Páez‐Espejo, Miguel; Varret, François; Boukheddaden, Kamel
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 5(2016)
• Page Start: 1755
• Page End: 1759
• Publication Date: 2016-01-06
• Subjects: elastic interface -- optical microscopy -- phase transition -- spatio-temporal properties -- spin-crossover; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201509294
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: By using a weak modulated laser intensity we have succeeded in reversibly controlling the dynamics of the spin‐crossover (SC) single crystal [{Fe(NCSe)(py)2 }2 ( m ‐bpypz)] inside the thermal hysteresis. The experiment could be repeated several times with a reproducible response of the high‐spin low‐spin interface and without crystal damage. In‐depth investigations as a function of the amplitude and frequency of the excitation brought to light the existence of a cut‐off frequency ca. 1.5 Hz. The results not only document the applicability of SC materials as actuators, memory devices, or switches, but also open a new avenue for the reversible photo‐control of the spin transition inside the thermal hysteresis. Abstract : Spin cycle : Illuminating one end of a spin‐crossover single crystal with a low intensity laser could reversibly change the spin state from low spin (LS) to high spin (HS). The progress of the transition along the crystal could be observed by light microscopy. The crystal maintained its integrity over several cycles suggesting applications in actuation, micro‐positioning, and switching devices.