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 which 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.
Highlights
Switching of the spin state, and the accompanying conductivity, with an electric field is a long-sought goal with great potential for energy-efficient electronics and data storage
Magnetic fields have been seen to perturb the spin state transition in [Mn3+] [10], Fe(1,10-phenanthroline)2 (NCS)2 [9], Fe(phen)2 (NCS)2 [11], [Fe{H2 B(pz)2 }2] (H2 B(pz)2 = bis(hydrido)bis(1H-pyrazol-1-yl) borate, bipy = 2,2’-bipyridine) [12]. These latter spin crossover systems all have a static electric dipole which is intrinsically dependent on the spin state; the perturbation of the spin state, such as with a magnetic field, is an example of magneto-electric coupling because there is an accompanying change in the electric polarization
The spin state occupancy of [Fe{H2 B(pz)2 }2] Fe(II) thin films may be ascertained from the X-ray absorption spectra (XAS) [12,19,20,21,22,23,24,25,26,27]
Summary
Switching of the spin state, and the accompanying conductivity, with an electric field is a long-sought goal with great potential for energy-efficient electronics and data storage Such magneto-electric coupling has a long history [1], dating back to 1894 [2]. Magnetic fields have been seen to perturb the spin state transition in [Mn3+ (taa)] [10], Fe(1,10-phenanthroline) (NCS)2 [9], Fe(phen) (NCS)2 [11], [Fe{H2 B(pz)2 }2 (bipy)] (H2 B(pz)2 = bis(hydrido)bis(1H-pyrazol-1-yl) borate, bipy = 2,2’-bipyridine) [12] These latter spin crossover systems all have a static electric dipole which is intrinsically dependent on the spin state; the perturbation of the spin state, such as with a magnetic field, is an example of magneto-electric coupling because there is an accompanying change in the electric polarization
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