Second harmonic generation in a molecular magnetic chain

Cavigli, Lucia; Sessoli, Roberta; Gurioli, Massimo; Bogani, Lapo

doi:10.1002/pssa.200566140

Cited by 9 publications

(12 citation statements)

References 25 publications

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“…The first attempts in this direction have already been made, demonstrating good multifunctional properties for these materials. 64,65 A second point, associated with optics, that needs more attention is the creation of photoswitchable SCMs. As mentioned before this goal seems particularly close thanks to the bridging groups used in some SCMs.…”

Section: Prospective Developmentsmentioning

confidence: 99%

“…Chiral SCMs seem particularly interesting from this point of view, offering stimulating systems for magneto-optical experiments. 64,65 Chemically, the advances already made in the synthesis of SCMs permit the planning of the creation of new materials using different building blocks. Elements in the 2nd and 3rd rows of transition metal ions seem to offer appropriate chemical and magnetic properties to provide new SCMs.…”

Section: Prospective Developmentsmentioning

confidence: 99%

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Single chain magnets: where to from here?

et al. 2008

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Single chain magnets (SCMs) are an interesting class of molecular polymeric materials displaying slow relaxation of the magnetization. They provide, at low temperatures, a magnetic hysteretic behaviour for a single polymeric chain. Although their behaviour evokes better-known magnetic nanoparticles and single-molecule magnets (SMMs), the similarity is mainly apparent. The fundamental differences in the physical origin of the magnetic behaviour offer perspectives that are still largely unexplored. Here we review the progress made in the synthesis, characterization and theoretical understanding of SCMs, highlighting differences and similarities with SMMs. For each of the points we then present a perspective of the advantages offered by this class of materials and we point out the main aspects that remain to be developed in the field.

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Section: Prospective Developmentsmentioning

confidence: 99%

Section: Prospective Developmentsmentioning

confidence: 99%

Single chain magnets: where to from here?

et al. 2008

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“…24,25 The compounds are optically active and exhibit a significant second harmonic generation efficiency. 26 The magnetism of both compounds is governed by the strong intra-chain antiferromagnetic exchange interaction between the alternating paramagnetic metal ions and the spin S =1/2 of the organic radicals, with exchange constant, J =235K and 495 K for the Co 27 and Mn 24 derivative, respectively. The exchange Hamiltonian for a chain of N spins is defined as scriptHex=JΣi=1N∕2s2i−1S2i+s2i+1S2i, where the small s on odd sites represents the radical spin while the capital S on s even sites either the Co II or Mn II spin.…”

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confidence: 99%

Strong magneto-chiral dichroism in a paramagnetic molecular helix observed by hard X-rays

et al. 2014

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Magneto-chiral dichroism (MχD) is a non-reciprocal, i. e. directional, effect observed in magnetised chiral systems featuring an unbalanced absorption of unpolarised light depending on the direction of the magnetisation. Despite the fundamental interest in a phenomenon breaking both parity and time reversal symmetries, MχD is one of the least investigated aspects of light-matter interaction because of the weakness of the effect in most reported experiments. Here we have exploited the element selectivity of hard X-ray radiation to investigate the magneto-chiral properties of enentiopure crsytals of two isostructural molecular helicoidal chains comprising Cobalt(II) and Manganese (II) ions, respectively. A strong magneto-chiral dichroism, with Kuhn asymmetry of the order of a few percent, has been observed in the Cobalt chain system, while it is practically absent for the Manganese derivative. The spectral features of the XMχD signal differ significantly from the natural and magnetic dichroic contributions and have been here rationalized using the simple multipolar expansion of matter-radiation interaction.

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“…Recently, dielectric relaxation and second harmonic generation (SHG) were, respectively, observed in molecule based chiral single chain magnets (SCMs). 4,5 Single molecule magnets (SMMs) 6 and SCMs 7 are single domain magnets below their critical temperatures, and the former show quantum tunnelling of magnetization (QTM). Although SCMs with chiral spin centers are expected to show enhanced synergistic effects of chirality and magnetism, the number of chiral SCMs is still limited.…”

mentioning

confidence: 99%