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Magnetic behaviour of TbPc2 single-molecule magnets chemically grafted on silicon surface.

Mannini M, Bertani F, Tudisco C, Malavolti L, Poggini L, Misztal K, Menozzi D, Motta A, Otero E, Ohresser P, Sainctavit P, Condorelli GG, Dalcanale E, Sessoli R - Nat Commun (2014)

Bottom Line: Going beyond investigations focused on physisorbed SMMs, in this work the robust grafting of terbium(III) bis(phthalocyaninato) complexes to a silicon surface from a diluted solution is achieved by rational chemical design yielding the formation of a partially oriented monolayer on the conducting substrate.Here by exploiting the surface sensitivity of X-ray circular magnetic dichroism, we evidence an enhancement of the magnetic bistability of this SMM, in contrast to the dramatic reduction of the magnetic hysteresis that characterizes monolayer deposits evaporated on noble and ferromagnetic metals.Photoelectron spectroscopy investigations and density functional theory analysis suggest a non-innocent role played by the silicon substrate, evidencing the potentiality of this approach for robust integration of bistable magnetic molecules in electronic devices.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry 'Ugo Schiff' and INSTM RU, University of Firenze, via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy.

ABSTRACT
Single-molecule magnets (SMMs) are among the most promising molecular systems for the development of novel molecular electronics based on spin transport. Going beyond investigations focused on physisorbed SMMs, in this work the robust grafting of terbium(III) bis(phthalocyaninato) complexes to a silicon surface from a diluted solution is achieved by rational chemical design yielding the formation of a partially oriented monolayer on the conducting substrate. Here by exploiting the surface sensitivity of X-ray circular magnetic dichroism, we evidence an enhancement of the magnetic bistability of this SMM, in contrast to the dramatic reduction of the magnetic hysteresis that characterizes monolayer deposits evaporated on noble and ferromagnetic metals. Photoelectron spectroscopy investigations and density functional theory analysis suggest a non-innocent role played by the silicon substrate, evidencing the potentiality of this approach for robust integration of bistable magnetic molecules in electronic devices.

No MeSH data available.


Related in: MedlinePlus

TbPc2(OC11H21)8@Si hysteresisa) XMCD-detected magnetisation curves for (n,k) = 60° as a function of the temperature in the TbPc2(OC11H21)8@Si monolayer. b-c) Comparison between the behaviour of the thick film and the monolayer, the latter being measured for (n,k) = 0° and 60°. These magnetisation curves, measured in the same condition for all the samples (2.2 ± 0.2 K and 500 Oe s−1 scan speed) through the XMCD technique, are reported in figure b) with their experimental error. In c) the hysteresis opening is estimated as ΔM(H) according to the procedure described in the text.
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Figure 5: TbPc2(OC11H21)8@Si hysteresisa) XMCD-detected magnetisation curves for (n,k) = 60° as a function of the temperature in the TbPc2(OC11H21)8@Si monolayer. b-c) Comparison between the behaviour of the thick film and the monolayer, the latter being measured for (n,k) = 0° and 60°. These magnetisation curves, measured in the same condition for all the samples (2.2 ± 0.2 K and 500 Oe s−1 scan speed) through the XMCD technique, are reported in figure b) with their experimental error. In c) the hysteresis opening is estimated as ΔM(H) according to the procedure described in the text.

Mentions: Fig. 5a reports the variation of the XMCD contribution at the M5 edge, normalised to the saturation value, as a function of the applied magnetic field between −50 kOe and 50 kOe at three different temperatures. We stress here that, profiting from the fast TEY detection setup and the stability of the experimental apparatus developed in the DEIMOS beamline,45 it has been possible to collect the signal as a function of the fast sweeping field, thus providing highly resolved XMCD-detected magnetisation curves clearly showing hysteretic behaviour already at 4.3 ± 0.2 K.


Magnetic behaviour of TbPc2 single-molecule magnets chemically grafted on silicon surface.

Mannini M, Bertani F, Tudisco C, Malavolti L, Poggini L, Misztal K, Menozzi D, Motta A, Otero E, Ohresser P, Sainctavit P, Condorelli GG, Dalcanale E, Sessoli R - Nat Commun (2014)

TbPc2(OC11H21)8@Si hysteresisa) XMCD-detected magnetisation curves for (n,k) = 60° as a function of the temperature in the TbPc2(OC11H21)8@Si monolayer. b-c) Comparison between the behaviour of the thick film and the monolayer, the latter being measured for (n,k) = 0° and 60°. These magnetisation curves, measured in the same condition for all the samples (2.2 ± 0.2 K and 500 Oe s−1 scan speed) through the XMCD technique, are reported in figure b) with their experimental error. In c) the hysteresis opening is estimated as ΔM(H) according to the procedure described in the text.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4129938&req=5

Figure 5: TbPc2(OC11H21)8@Si hysteresisa) XMCD-detected magnetisation curves for (n,k) = 60° as a function of the temperature in the TbPc2(OC11H21)8@Si monolayer. b-c) Comparison between the behaviour of the thick film and the monolayer, the latter being measured for (n,k) = 0° and 60°. These magnetisation curves, measured in the same condition for all the samples (2.2 ± 0.2 K and 500 Oe s−1 scan speed) through the XMCD technique, are reported in figure b) with their experimental error. In c) the hysteresis opening is estimated as ΔM(H) according to the procedure described in the text.
Mentions: Fig. 5a reports the variation of the XMCD contribution at the M5 edge, normalised to the saturation value, as a function of the applied magnetic field between −50 kOe and 50 kOe at three different temperatures. We stress here that, profiting from the fast TEY detection setup and the stability of the experimental apparatus developed in the DEIMOS beamline,45 it has been possible to collect the signal as a function of the fast sweeping field, thus providing highly resolved XMCD-detected magnetisation curves clearly showing hysteretic behaviour already at 4.3 ± 0.2 K.

Bottom Line: Going beyond investigations focused on physisorbed SMMs, in this work the robust grafting of terbium(III) bis(phthalocyaninato) complexes to a silicon surface from a diluted solution is achieved by rational chemical design yielding the formation of a partially oriented monolayer on the conducting substrate.Here by exploiting the surface sensitivity of X-ray circular magnetic dichroism, we evidence an enhancement of the magnetic bistability of this SMM, in contrast to the dramatic reduction of the magnetic hysteresis that characterizes monolayer deposits evaporated on noble and ferromagnetic metals.Photoelectron spectroscopy investigations and density functional theory analysis suggest a non-innocent role played by the silicon substrate, evidencing the potentiality of this approach for robust integration of bistable magnetic molecules in electronic devices.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry 'Ugo Schiff' and INSTM RU, University of Firenze, via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy.

ABSTRACT
Single-molecule magnets (SMMs) are among the most promising molecular systems for the development of novel molecular electronics based on spin transport. Going beyond investigations focused on physisorbed SMMs, in this work the robust grafting of terbium(III) bis(phthalocyaninato) complexes to a silicon surface from a diluted solution is achieved by rational chemical design yielding the formation of a partially oriented monolayer on the conducting substrate. Here by exploiting the surface sensitivity of X-ray circular magnetic dichroism, we evidence an enhancement of the magnetic bistability of this SMM, in contrast to the dramatic reduction of the magnetic hysteresis that characterizes monolayer deposits evaporated on noble and ferromagnetic metals. Photoelectron spectroscopy investigations and density functional theory analysis suggest a non-innocent role played by the silicon substrate, evidencing the potentiality of this approach for robust integration of bistable magnetic molecules in electronic devices.

No MeSH data available.


Related in: MedlinePlus