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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.


X-ray polarized light absorptionXNLD (a) and XMCD (b) measurements at 2.2 ± 0.2 K, 50kOe, for (n,k) = 60°. In the inset the geometry of the two experiments are presented: in a XNLD experiment vertical (σV) and horizontally (σH) polarised light are used and the sample is rotated by an angle θ between the normal to the surface and the X-ray light propagation direction, an external magnetic field is used only to enhance the TEY detection capabilities; in XMCD experiment light with opposite circular polarization, σ+ and σ−, is employed in an analogous experimental geometry, external magnetic field and θ are varied to extract additional information.
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Figure 4: X-ray polarized light absorptionXNLD (a) and XMCD (b) measurements at 2.2 ± 0.2 K, 50kOe, for (n,k) = 60°. In the inset the geometry of the two experiments are presented: in a XNLD experiment vertical (σV) and horizontally (σH) polarised light are used and the sample is rotated by an angle θ between the normal to the surface and the X-ray light propagation direction, an external magnetic field is used only to enhance the TEY detection capabilities; in XMCD experiment light with opposite circular polarization, σ+ and σ−, is employed in an analogous experimental geometry, external magnetic field and θ are varied to extract additional information.

Mentions: At first, X-ray Natural Linear Dichroism (XNLD) has been measured for the M4,5 Tb edges. The sample has been set so that the normal to the surface n and the X-ray propagation vector k lie in the horizontal plane with (n,k) = 60°. The cross-sections with horizontal linear polarisation (σH) and with vertical linear polarisation (σV) have been measured (See Figure 4a and Supplementary Figure 9).


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)

X-ray polarized light absorptionXNLD (a) and XMCD (b) measurements at 2.2 ± 0.2 K, 50kOe, for (n,k) = 60°. In the inset the geometry of the two experiments are presented: in a XNLD experiment vertical (σV) and horizontally (σH) polarised light are used and the sample is rotated by an angle θ between the normal to the surface and the X-ray light propagation direction, an external magnetic field is used only to enhance the TEY detection capabilities; in XMCD experiment light with opposite circular polarization, σ+ and σ−, is employed in an analogous experimental geometry, external magnetic field and θ are varied to extract additional information.
© Copyright Policy
Related In: Results  -  Collection

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Figure 4: X-ray polarized light absorptionXNLD (a) and XMCD (b) measurements at 2.2 ± 0.2 K, 50kOe, for (n,k) = 60°. In the inset the geometry of the two experiments are presented: in a XNLD experiment vertical (σV) and horizontally (σH) polarised light are used and the sample is rotated by an angle θ between the normal to the surface and the X-ray light propagation direction, an external magnetic field is used only to enhance the TEY detection capabilities; in XMCD experiment light with opposite circular polarization, σ+ and σ−, is employed in an analogous experimental geometry, external magnetic field and θ are varied to extract additional information.
Mentions: At first, X-ray Natural Linear Dichroism (XNLD) has been measured for the M4,5 Tb edges. The sample has been set so that the normal to the surface n and the X-ray propagation vector k lie in the horizontal plane with (n,k) = 60°. The cross-sections with horizontal linear polarisation (σH) and with vertical linear polarisation (σV) have been measured (See Figure 4a and Supplementary Figure 9).

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.