Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide

Wäckerlin, Christian; Donati, Fabio; Singha, Aparajita; Baltić, Romana; Uldry, Anne Christine; Delley, B.; Rusponi, Stefano; Dreiser, Jan

doi:10.1039/c5cc01823d

Cited by 15 publications

(9 citation statements)

References 37 publications

(13 reference statements)

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“…Also, the magnetic ground states of the metal and oxide are distinct at low temperatures. Whereas EuO is ferromagnetic at T C ≈ 67 K [28,29] with finite hysteresis [29,30], Eu metal undergoes an incommensurate helical magnetic structure at T N ≈ 91 K [31,32]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

Intercalated europium metal in epitaxial graphene on SiC

Anderson

Hupalo

Keavney

et al. 2017

Phys. Rev. Materials

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X-ray magnetic circular dichroism (XMCD) reveals the magnetic properties of intercalated europium metal under graphene on SiC(0001). The intercalation of Eu nanoclusters (average size 2.5 nm) between graphene and SiC substate are formed by deposition of Eu on epitaxially grown graphene that is subsequently annealed at various temperatures while keeping the integrity of the graphene layer. Using sum-rules analysis of the XMCD of Eu M4,5 edges at T=15 K, our samples show paramagnetic-like behavior with distinct anomaly at T≈90 K, which may be related to the Nèel transition, TN=91 K, of bulk metal Eu. We find no evidence of ferromagnetism due to EuO or antiferromagnetism due to Eu2O3, indicating that the graphene layer protects the intercalated metallic Eu against oxidation over months of exposure to atmospheric environment. X-ray magnetic circular dichroism (XMCD) reveals the magnetic properties of intercalated europium metal under graphene on SiC(0001). The intercalation of Eu nanoclusters (average size 2.5 nm) between graphene and SiC substate are formed by deposition of Eu on epitaxially grown graphene that is subsequently annealed at various temperatures while keeping the integrity of the graphene layer. Using sum-rules analysis of the XMCD of Eu M 4,5 edges at T = 15 K, our samples show paramagnetic-like behavior with distinct anomaly at T ≈ 90 K, which may be related to the Nèel transition, T N = 91 K, of bulk metal Eu. We find no evidence of ferromagnetism due to EuO or antiferromagnetism due to Eu 2 O 3 , indicating that the graphene layer protects the intercalated metallic Eu against oxidation over months of exposure to atmospheric environment. Disciplines Materials Science and Engineering | Metallurgy

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Section: Resultsmentioning

confidence: 98%

Intercalated europium metal in epitaxial graphene on SiC

Anderson

Hupalo

Keavney

et al. 2017

Phys. Rev. Materials

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“…As a proof of principle, the implementation of the device into a UHV chamber in combination with real-time modulated RD-MOKE spectroscopy is described in Section III. The results show the advantages of employing the present design for real-time investigations of the magnetic properties of growing ferromagnetic thin films and its potential to elucidate the magnetic coupling at surfaces and interfaces between organic/inorganic systems 3,[11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 90%

“…Such magnetic field strengths would also be sufficient for real-time investigations of hybrid organic/inorganic magnetic systems 12,[14][15][16] .…”

mentioning

confidence: 99%

In-situ electromagnet with active cooling for real-time magneto-optic Kerr effect spectroscopy

Brozyniak,

Mendirek,

Hohage

et al. 2020

Preprint

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We present a compact in-situ electromagnet with an active cooling system for the use in ultra-high vacuum environments. The active cooling enhances the thermal stability and increases the electric current that can be applied through the coil, promoting the generation of homogeneous magnetic fields, required for applications in real-time deposition experiments. The electromagnet has been integrated into a reflectance difference magneto-optic Kerr effect (RD-MOKE) spectroscopy system that allows the synchronous measurement of the optical anisotropy and the magneto-optic response in polar MOKE geometry. Proof of principle studies have been performed in real-time during the deposition of ultra-thin Ni films on Cu( 110)-(2×1)O surfaces, corroborating the extremely sharp spin reorientation transition above a critical coverage of 9 monolayers and demonstrating the potential of the applied setup for real-time and in-situ investigations of magnetic thin films and interfaces.

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“…Phthalocyanines are macrocyclic compounds with 18π-electrons in the inner core. Although phthalocyanines were used as dyes and pigments in ancient times, currently their usage includes liquid crystals, 1,2 non-linear optical materials, 3 semiconductors, 4,5 gas sensors, [6][7][8] electrocatalysis, 9,10 solar cells, [11][12][13] optical data storage, 14,15 catalysts [16][17][18] and photodynamic therapy. [19][20][21][22] The major drawback with phthalocyanines is the aggregation of phthalocyanines and their poor solubility in common organic solvents which limits their application.…”

Section: Introductionmentioning

confidence: 99%

Electropolymerizable peripherally tetra-{2-[3-(diethylamino)phenoxy]ethoxy} substituted as well as axially (4-phenylpiperazin-1-yl)propanoxy-disubstituted silicon phthalocyanines and their electrochemistry

Bıyıklıoğlu

Alp

2015

Dalton Trans.

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A novel type of peripherally tetra-substituted as well as axially disubstituted silicon(iv) phthalocyanine containing electropolymerizable ligands was designed and synthesized for the first time. Axial bis-hydroxy silicon phthalocyanine 2 was prepared from 2(3),9(10),16(17),23(24)-tetrakis-{2-[3-(diethylamino)phenoxy]ethoxy}phthalocyanine 1 in dichloromethane by using 1.8-diazabicyclo[5.4.0]undec-7-ene (DBU) and trichlorosilane. Peripherally tetra and axially di-substituted silicon phthalocyanine 4 was synthesized from 2(3),9(10),16(17),23(24)-tetrakis-{2-[3-(diethylamino)phenoxy]ethoxy}silicon(iv)phthalocyanine dihydroxide 2 with 1-(3-chloropropyl)-4-phenylpiperazine 3 in toluene in the presence of NaH at 120 °C. These complexes were fully characterized by various spectroscopy techniques such as (1)H-NMR, (13)C-NMR, IR, UV-Vis, and MALDI-TOF spectroscopy and elemental analysis as well. Electropolymerization properties of silicon(IV) phthalocyanine complexes were investigated by cyclic and square wave voltammetry. Electrochemical studies reveal that silicon(IV) phthalocyanine complexes were electropolymerized on the working electrode during the anodic potential scan. This study is the first example of electropolymerization of both peripherally tetra and axially di-substituted silicon phthalocyanines on the same molecule.

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Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide

Abstract: We report on the antiferromagnetic exchange coupling between a submonolayer of Mn(II)-phthalocyanine molecules and a ferromagnetic Eu(II)-oxide thin film. The exchange energy is larger by nearly two orders of magnitude compared to previous studies involving oxidic substrates.

Cited by 15 publications

References 37 publications

Intercalated europium metal in epitaxial graphene on SiC

Intercalated europium metal in epitaxial graphene on SiC

In-situ electromagnet with active cooling for real-time magneto-optic Kerr effect spectroscopy

Electropolymerizable peripherally tetra-{2-[3-(diethylamino)phenoxy]ethoxy} substituted as well as axially (4-phenylpiperazin-1-yl)propanoxy-disubstituted silicon phthalocyanines and their electrochemistry

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