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Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material

Groupe d’Etudes de la Matière Condensée, Université de Versailles, Université Paris-Saclay, CNRS UMR 8635, 45 Avenue des Etats Unis, 78035 Versailles, France
Institut de Chimie de la Matière Condensée de Bordeaux, Université’ de Bordeaux, 87 Av. Doc. A. Schweitzer, F-33608 Pessac, France
Author to whom correspondence should be addressed.
Magnetochemistry 2019, 5(2), 21;
Received: 28 February 2019 / Revised: 20 March 2019 / Accepted: 22 March 2019 / Published: 1 April 2019
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
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We have investigated by means of optical microscopy and magnetic measurements the first-order thermal spin transition of the [{Fe(NCSe)(py)2}2(m-bpypz)] spin-crossover compound under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photo-heating effects on the thermally-induced hysteretic response of this spin-crossover material, thus causing the shift of the thermal hysteresis to lower temperature regions. The experimental results are discussed in terms of the apparent crystal temperature and are analyzed theoretically using two evolution equations of motion, written on the high-spin (HS) fraction and heat balance between the crystal and the thermal bath. A very good qualitative agreement was found between experiment and theory in the stationary regime, explaining the experimental observations well and identifying the key factors governing these photo-thermal effects. View Full-Text
Keywords: spin crossover; heat transfer; photo-magnetism; optical microscopy spin crossover; heat transfer; photo-magnetism; optical microscopy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Boukheddaden, K.; Fourati, H.; Singh, Y.; Chastanet, G. Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material. Magnetochemistry 2019, 5, 21.

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