Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Magnetic Field Perturbations to a Soft X-Ray Activated Fe (II) Molecular Spin State Transition

Version 1 : Received: 17 August 2021 / Approved: 18 August 2021 / Online: 18 August 2021 (11:30:12 CEST)

How to cite: Hao, G.; N'Diaye, A.T.; Ekanayaka, T.K.; Dale, A.S.; Jiang, X.; Mishra, E.; Mellinger, C.; Yazdani, S.; Freeland, J.W.; Zhang, J.; Cheng, R.; Xu, X.; Dowben, P.A. Magnetic Field Perturbations to a Soft X-Ray Activated Fe (II) Molecular Spin State Transition. Preprints 2021, 2021080377 (doi: 10.20944/preprints202108.0377.v1). Hao, G.; N'Diaye, A.T.; Ekanayaka, T.K.; Dale, A.S.; Jiang, X.; Mishra, E.; Mellinger, C.; Yazdani, S.; Freeland, J.W.; Zhang, J.; Cheng, R.; Xu, X.; Dowben, P.A. Magnetic Field Perturbations to a Soft X-Ray Activated Fe (II) Molecular Spin State Transition. Preprints 2021, 2021080377 (doi: 10.20944/preprints202108.0377.v1).

Abstract

The X-ray induced spin crossover transition of an Fe(II) molecular thin film in the presence and absence of a magnetic field has been investigated. The thermal activation energy barrier in the soft X-ray activation of the spin crossover transition for [Fe{H2B(pz)2}2(bipy)] molecular thin films is reduced in the presence of an applied magnetic field, as measured through X-ray absorption spectroscopy at various temperatures. The influence of a 1.8 T magnetic field is sufficient to cause deviations from the expected exponential spin state transition behavior that is measured in the field free case. We find that orbital moment diminishes with increasing temperature, relative to the spin moment in the vicinity of room temperature.

Keywords

Spin crossover; Fe(II); activation barriers; X-ray excitation; magnetic field effects; [Fe{H2B(pz)2}2(bipy)]; molecular multiferroic.

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