Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-iron(II) phthalocyanine

Evangelisti, Marco; Bartolomé, J.; Jongh, L.J. de; Filoti, G.

doi:10.1103/physrevb.66.144410

Cited by 104 publications

(96 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(b) 6,7 . Note that although the columnar stacking breaks the D 4h symmetry at the Fe position, the constraint fields, as done previously, can still be imposed.…”

Section: Resultsmentioning

confidence: 99%

Constraint density functional calculations for multiplets in a ligand-field applied to Fe-phthalocyanine

et al. 2012

View full text Add to dashboard Cite

Multiplets in a ligand-field are treated within total-energy density functional calculations by imposing density matrix constraints on the d-orbital occupation numbers consistent with the local site and state symmetries. We demonstrate the utility of this approach for the case of isolated Fe phthalocyanine (FePc) molecules with overall D 4h symmetry: We find three stationary states of 3 Eg, 3 A2g, and 3 B2g symmetries of the Fe 2+ ion and total energy calculations clearly demonstrate that the ground state is 3 A2g. By contrast, a columnar stacking of the FePc molecules (α-FePc) is found to change the ground state to 3 Eg due to hybridization between adjacent molecules.

show abstract

“…1(b) 6,7 . Note that although the columnar stacking breaks the D 4h symmetry at the Fe position, the constraint fields, as done previously, can still be imposed.…”

Section: Resultsmentioning

confidence: 99%

Constraint density functional calculations for multiplets in a ligand-field applied to Fe-phthalocyanine

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Note that, the Curie temperature of this FePc film is lower than the reported T C = 10 K for the bulk ␣-FePc. 11 This decrease in T C could be expected as a size effect due to the reduced ͑80 nm͒ thickness of the film. The hysteresis curves at 6 K have no open loops ͑not shown͒, but still M xy Ͼ M z up to 0.6 T, so the xy anisotropy remains in the paramagnetic region near T C .…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Highly unquenched orbital moment in textured Fe-phthalocyanine thin films

et al. 2010

Self Cite

View full text Add to dashboard Cite

X-ray magnetic circular dichroism ͑XMCD͒ measured at T = 6 K and 0 H = 5 T on the ␣-phase Fephthalocyanine ͑FePc͒ textured thin films shows that the Fe 2+ ions present an unusually large, highly unquenched m L = 0.53Ϯ 0.04 B orbital component, with planar anisotropy. The spin m S = 0.64Ϯ 0.05 B and the intra-atomic magnetic dipolar m T components were also obtained. The m L / m S = 0.83 ratio is the largest measured in 3d complexes and compounds. The origin of this unusually high orbital moment is the incompletely filled e g level lying close to the Fermi energy. This explains the unusually large and positive hyperfine field detected by Mössbauer spectroscopy in FePc. The FePc film strong planar anisotropy inferred from XMCD experiments is fully confirmed by magnetization measurements.

show abstract

“…17 Previously, powder iron phthalocyanine (FePc) samples were found to exhibit low-temperature long-range ferromagnetic order. 18,19 In such systems, the iron atoms couple ferromagnetically along quasi one-dimensional chains, while at the same time there is weak antiferromagnetic interaction between chains. Due to weak van-der-Waals forces in organic molecules, several polymorphs of iron phthalocyanine exist.…”

mentioning

confidence: 99%

Substrate-controlled ferromagnetism in iron phthalocyanine films due to one-dimensional iron chains

et al. 2012

View full text Add to dashboard Cite

Using magneto-optical Kerr effect, SQUID magnetometry and magnetic circular dichroism spectroscopy, ferromagnetism was found below 4.5K in iron phthalocyanine thin films grown by molecular beam epitaxy. The stacking of the molecules can be controlled via deposition temperature and substrate choice. The molecules self-assemble such that quasi one-dimensional iron chains form. The chains are limited in length by the grain size or film thickness which is manipulated using judicious growth methods. Magnetic hysteresis loops show distinct features in the saturation magnetization and susceptibility that depend on the thin film structure and/or substrate. We find two regimes for the magnetic behavior: below temperatures of ∼ 25K, intra-chain interactions couple the Fe ions and produce non-traditional paramagnetic behavior, while at low temperatures below ∼ 4.5K interactions between the one-dimensional chains produce hysteresis, magnetic order, and slow magnetization dynamics.

show abstract

Magnetic properties ofα-iron(II) phthalocyanine

Cited by 104 publications

References 38 publications

Constraint density functional calculations for multiplets in a ligand-field applied to Fe-phthalocyanine

Constraint density functional calculations for multiplets in a ligand-field applied to Fe-phthalocyanine

Highly unquenched orbital moment in textured Fe-phthalocyanine thin films

Substrate-controlled ferromagnetism in iron phthalocyanine films due to one-dimensional iron chains

Contact Info

Product

Resources

About