Recovery of the bulk-like electronic structure of manganese phthalocyanine beyond the first monolayer on Bi2Te3

Hewitt, Andrew; Boltersdorf, Jonathan; Maggard, Paul A.; Dougherty, Daniel B.

doi:10.1016/j.susc.2017.03.014

Cited by 5 publications

(3 citation statements)

References 34 publications

(52 reference statements)

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“…The recently increasing research efforts devoted to transition metal phthalocyanines (TMPcs) and porphyrins (TMPors) derive from their unique optical, electronic, and magnetic properties. , Fundamental magnetic interactions of TMPcs were found on various types of substrates, − which may support their application in molecular quantum devices. On the other hand, the electronic configuration of the central metal atom of some TMPcs is still not completely understood and has been intensely debated in recent years, in particular, at interfaces. − An impressive example for their complex electronic structure is iron phthalocyanine (FePc).…”

Section: Introductionmentioning

confidence: 99%

Spin State in Perfluorinated FePc Films on Cu(111) and Ag(111) in Dependence on Film Thickness

et al. 2018

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The electronic structure of the central iron ion of perfluorinated iron phthalocyanine (FePcF 16 ) in thin films has been studied on Cu(111) and Ag(111) using polarization dependent X-ray absorption spectroscopy (XAS). The data are compared to FePc on Ag(111). Ligand field parameters have been computed, and multiplet calculations (CTM4XAS) were carried out to simulate XAS spectra. The planar molecules are preferentially oriented lying flat on the substrate surface during the growth of the 1−4 nm thick films. A clear polarization dependence of the Fe L edge absorption spectra is observed, arising from transitions into orbitals with in-plane and out-of-plane character. The shape of the spectra for three to four monolayers of FePcF 16 on Cu(111) is comparable to that of the thin films of FePc on Ag(111). However, a drastic change of the XAS peak shape is observed for thicker FePcF 16 films on both Ag(111) and Cu(111), although the molecular orientation is very similar to coverages consisting of a few monolayers. Since in both cases the film thickness is distinctly beyond the monolayer regime, interface interactions can be ruled out as a possible origin of this behavior. Rather, the different XAS peak shapes seem to indicate that the multiplicity may depend on the detailed arrangement of the FePcF 16 molecules. The large flexibility of the ground state of Fe could be of high interest for spintronic applications.

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Section: Introductionmentioning

confidence: 99%

Spin State in Perfluorinated FePc Films on Cu(111) and Ag(111) in Dependence on Film Thickness

et al. 2018

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“…Taking into account that organic molecules are usually weakly bonded to the substrate, the use of magnetic organic molecules has possibility to solve this problem. Transition metal phthalocyanines (TMPc, TM = Mn, Fe, Co, Ni, and Cu) are typical magnetic organic molecules that show different spin phenomena depending on the center TM atom. , The effect of TMPc adsorption on TIs has been widely studied using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) ,− but less studied with photoelectron spectroscopy (PES). − …”

Section: Introductionmentioning

confidence: 99%

Substrate-Dependent Physical Properties at the Interface of Manganese(II) Phthalocyanine and Topological Insulators

Itaya,

Higuchi,

Nishioka

et al. 2024

J. Phys. Chem. C

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A proper understanding of the physical properties at the interface between a nonmagnetic topological insulator and a magnetic film is an indispensable input to develop high-functional spintronics devices using topological insulators. In this paper, we show the physical properties of manganese(II) phthalocyanine (MnPc)-adsorbed Bi 2 Se 3 and TlBiSe 2 , two topological insulators with similar electronic states but different surface compositions. The adsorption of MnPc induces significant electron doping on Bi 2 Se 3 , while only a small hole doping was induced on TlBiSe 2 . This difference in doping is due to the different molecular orientations on the two topological insulators: the flat-lying configuration on Bi 2 Se 3 that leads to a large overlap between the d-orbital of Mn and orbitals of surface Se, and the upright configuration on TlBiSe 2 that results from the presence of Tl atoms on the surface and leads to a negligible orbital overlap. These results pave the way for applications in spintronics devices combining magnetic organic molecules and topological insulators.

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“…The degree of tunability of charge and spin interactions offered by metal–organic layers has already been demonstrated on metallic surfaces. ,− The few systematic studies on TIs suggest a similar tunability, driven by the choice of either the metal ion or the ligand . Surprisingly, despite the considerably larger distance from the surface, compared to bare impurities, interactions between the molecular metal ions and the TSS can still be strong enough to lead to doping levels comparable to those observed for bare impurities, , form hybrid interface states, − and, more dramatically, suppress the TSS from the first quintuple layer (QL), as recently found for cobalt phthalocyanine (CoPc) on Bi 2 Se 3 . A follow-up study concluded that nonperturbative interactions can only be achieved with molecules with nonplanar coordination geometry, where the metal ion is protected by the ligand core from surface-induced perturbations.…”

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confidence: 99%

Molecular Approach for Engineering Interfacial Interactions in Magnetic/Topological Insulator Heterostructures

et al. 2020

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Controlling interfacial interactions in magnetic/ topological insulator heterostructures is a major challenge for the emergence of novel spin-dependent electronic phenomena. As for any rational design of heterostructures that rely on proximity effects, one should ideally retain the overall properties of each component while tuning interactions at the interface. However, in most inorganic interfaces, interactions are too strong, consequently perturbing, and even quenching, both the magnetic moment and the topological surface states at each side of the interface. Here, we show that these properties can be preserved using ligand chemistry to tune the interaction of magnetic ions with the surface states. By depositing Co-based porphyrin and phthalocyanine monolayers on the surface of Bi 2 Te 3 thin films, robust interfaces are formed that preserve undoped topological surface states as well as the pristine magnetic moment of the divalent Co ions. The selected ligands allow us to tune the interfacial hybridization within this weak interaction regime. These results, which are in stark contrast with the observed suppression of the surface state at the first quintuple layer of Bi 2 Se 3 induced by the interaction with Co phthalocyanines, demonstrate the capability of planar metal−organic molecules to span interactions from the strong to the weak limit.

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Recovery of the bulk-like electronic structure of manganese phthalocyanine beyond the first monolayer on Bi2Te3

Cited by 5 publications

References 34 publications

Spin State in Perfluorinated FePc Films on Cu(111) and Ag(111) in Dependence on Film Thickness

Spin State in Perfluorinated FePc Films on Cu(111) and Ag(111) in Dependence on Film Thickness

Substrate-Dependent Physical Properties at the Interface of Manganese(II) Phthalocyanine and Topological Insulators

Molecular Approach for Engineering Interfacial Interactions in Magnetic/Topological Insulator Heterostructures

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