Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

Abstract

† Electronic supplementary information (ESI) available: Maldi-ToF spectrum of [TbPc2] 0 (Fig. S1). UV/vis/nIR spectrum of [TbPc2] 0 (Fig. S2). MOKE spectrum of a blank Si substrate (Fig. S3). VASE spectra of one sample and the model fit (Fig. S4), and in-plane components (Fig. S5), as well as the out-of-plane components of the dielectric tensor (Fig. S6) of the TbPc2 films grown on SiO2/Si. Complex refractive index of TbPc2/PTCDA (Fig. S7). Complex refractive index of TbPc2/Co (Fig. S8). Ligand field parameters of TbPc2 powder and film (Table S1).In this work, we investigated the magneto-optical response of thin films of TbPc2 on substrates which are relevant for (spin) organic field effect transistors (SiO2) or vertical spin valves (Co) in order to explore the possibility of implementing TbPc2 in magneto-electronic devices, the functionality of which includes optical reading. The optical and magneto-optical properties of TbPc2 thin films prepared by organic molecular beam deposition (OMBD) on silicon substrates covered with native oxide were investigated by variable angle spectroscopic ellipsometry (VASE) and magneto-optical Kerr effect (MOKE) spectroscopy at room temperature. The magneto-optical activity of the TbPc2 films can be significantly enhanced by one to two orders of magnitude when changing the molecular orientation (from nearly standing molecules on SiO2/Si substrates to nearly lying molecules on perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) templated SiO2/Si substrates) or by using metallic ferromagnetic substrates (Co).

Controlling Ferromagnetic Ground States and Solitons in Thin Films and Nanowires Built from Iron Phthalocyanine Chains

“…These values are slightly lower than previous reported ones obtained using AC susceptibility or magnetic circular dichroism (MCD) . However, these techniques employ high frequencies or sizeable external fields, and have been shown to overestimate magnetic blocking temperatures in double decker Pcs; therefore they are expected to increase the measured θ p in this system too . The Curie constants extracted from the fits between 30 and 80 K are (1.80 ± 0.05) × 10 −5 and (1.46 ± 0.06) × 10 −5 m 3 K mol −1 for the nontemplated and templated case, respectively.…”

Anomalously Large Spectral Shifts near the Quantum Tunnelling Limit in Plasmonic Rulers with Subatomic Resolution

“…72 While the UV-Vis absorption spectra of the BPc* complexes studied here exhibit a noticeable spectral shift from Sm to Lu (Figure 2c), the range ∆ α ≈ 12 nm (∆ ≈ 30 meV) is only 40% of the observed energy shift in ̅ C and occurs in the opposite direction. The corresponding resonant refractive index is larger on the longer wavelength side of α , and a quantitative model based on the measured ( ) for TbPc2 thin films 67 , shifted according to α (Ln), indeed confirms that this cannot account for ∆ C (Figs.S2-5 and accompanying discussion). The predicted increase in from Lu to Sm at the plasmon resonance decreases ∆ C relative to the model, directly contradicted by our experimental data.…”

“…42,47,51,76 While preliminary DFT calculations (SI) and literature data 43,47,52 suggest a staggered molecular conformation ( = 45°) in the neutral state, has been observed to vary with Ln size in singly-reduced [BPc]complexes. 43,67,77 Previous studies also suggest that BPc derivatives can adopt this reduced state upon contact with a metal surface. 76,78,79 Subsequent variations in may therefore affect the molecular polarizability and conductance.…”

Heteronuclear {TbxEu1−x} furoate 1D polymers presenting luminescent properties and SMM behavior

“…[5][6][7][8] Within the huge family of lanthanidebased molecular magnets, Dy(III) has been the most popular ion for the synthesis of Single-Ion Magnets (SIMs) 10 and Single Molecule Magnets (SMMs). 9 Complexes based on terbium (III) non-Kramer's ion are less numerous, but with a leading importance in the field, like the first and extensively studied double-decker [TbPc 2 ] -SIMs, [10][11][12][13] some SMMs with record energy barriers (U eff =938 K) 14 , the first 3d-4f SMM ([CuLTb(hfac) 2 ] 2 ), 15 and complex {[(Me 3 Si) 2 N] 2 (THF)Tb} 2 (µ-N 2 ) 16 deploying one of the highest blocking temperatures (T B = 14 K) within all SMMs. 16 Works on SMMs including two different (Ln-Ln') ions are much scarcer.…”