Interface-assisted molecular spintronics

Raman, Karthik V.

doi:10.1063/1.4890496

Cited by 63 publications

(48 citation statements)

References 77 publications

(118 reference statements)

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“…These well-defined molecular structures are promising and important for the understanding and manipulation of spin and for the development of spin-based information processing [5,6]. Particularly, magnetic single molecules with metal atoms in the center exhibit great potential in quantum computation [7][8][9]. Furthermore, these molecules are even more fascinating due to their charming potential in molecular motors or generators [10].…”

Section: Introductionmentioning

confidence: 97%

Structural, electronic and magnetic properties of 8-hydroxyquinoline-based small molecules TMQx (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn, and x=2 or 3)

Yuan

Jiang

Xie

et al. 2015

Physica E: Low-dimensional Systems and Nanostructures

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Section: Introductionmentioning

confidence: 97%

Structural, electronic and magnetic properties of 8-hydroxyquinoline-based small molecules TMQx (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn, and x=2 or 3)

Yuan

Jiang

Xie

et al. 2015

Physica E: Low-dimensional Systems and Nanostructures

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“…Accordingly, they gathered information on the energy level alignment at the interface, which is the energy barrier for carrier injection from the Fermi level of a metal into the highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO) levels of a molecular material 21 . Subsequent studies presented a more refined understanding of the energetics of molecular interfaces by, for instance, developing concepts such as energy level broadening or polaronic effects 23 .Although the energetics of molecular interfaces is a wide and complex topic slightly beyond the scope of this Perspective, we would like nevertheless to highlight some aspects that are relevant for interfacial spintronics 26,27 . The molecule-substrate interaction on inert surfaces such as gold is determined by weak van der Waals forces in a regime usually called physisorption.…”

mentioning

confidence: 98%

“…Although the energetics of molecular interfaces is a wide and complex topic slightly beyond the scope of this Perspective, we would like nevertheless to highlight some aspects that are relevant for interfacial spintronics 26,27 . The molecule-substrate interaction on inert surfaces such as gold is determined by weak van der Waals forces in a regime usually called physisorption.…”

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confidence: 99%

Activating the molecular spinterface

2017

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The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba-Edelstein effect and the spin-momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.

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“…Charge transfer at molecular interfaces can then be used to control spin polarisation or magnetisation, with far reaching consequences in the design of devices for electronic, power or computing applications. 6,7 Multifunctional materials with the spin degree of freedom such as multiferroics, magnetic semiconductors and molecular magnets have all aroused huge interest as potentially transformative components in quantum technologies. [8][9][10][11][12] Strategies used to bring magnetic ordering to these materials typically rely on the inclusion of magnetic transition metals, heavy elements with a large atomic moment or rare earths.…”

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confidence: 99%

Beating the Stoner criterion using molecular interfaces

Ma’Mari

Moorsom

Teobaldi

et al. 2015

Nature

172

184

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It is accepted that only three elements are ferromagnetic at room temperature, the transition metals iron, cobalt and nickel. The Stoner criterion explains why, for example, iron is ferromagnetic but manganese is not, even though both elements have an unfilled 3d shell and are adjacent in the periodic table: the product of the density of states with the exchange integral must be greater than unity for spontaneous ordering to emerge.1,2 Here, we demonstrate that it is possible to alter the electronic states of nonferromagnetic materials, such as diamagnetic copper and paramagnetic manganese, in 2 order to drive them ferromagnetic at room temperature. This remarkable effect is achieved via interfaces between metallic thin films and C 60 molecular layers. The emergent ferromagnetic state can exist over several layers of the metal before being quenched at large sample thicknesses by the material's bulk properties. While the induced magnetisation is easily measurable by magnetometry, low energy muon spin spectroscopy 3 provides insight into its magnetic distribution by studying the depolarisation process of low energy muons implanted in the sample. This technique indicates localized spin-ordered states at and close to the metallo-molecular interface.Density functional theory simulations suggest a mechanism based on magnetic hardening of the metal atoms due to electron transfer. 4,5 This opens a path for the exploitation of molecular coupling to design magnetic metamaterials using abundant, non-toxic elements such as organic semiconductors. Charge transfer at molecular interfaces can then be used to control spin polarisation or magnetisation, with far reaching consequences in the design of devices for electronic, power or computing applications. 6,7 Multifunctional materials with the spin degree of freedom such as multiferroics, magnetic semiconductors and molecular magnets have all aroused huge interest as potentially transformative components in quantum technologies. [8][9][10][11][12] Strategies used to bring magnetic ordering to these materials typically rely on the inclusion of magnetic transition metals, heavy elements with a large atomic moment or rare earths. In thin film structures, proximity effects and coupling at interfaces play an essential role. 13,14 This is especially the case for molecular spintronics, 15,16 where organic thin films grown on copper have demonstrated spin filtering. 17The organic magnetic coupling can propagate for long distances in systems such as nanoscale vortex-like configurations or nanoskyrmion lattices. 183We choose C 60 as a model molecule due to its structural simplicity and robustness as well as its high electron affinity. C 60 /transition metal complexes exhibit strong interfacial coupling between metal 3d z electrons and molecular π-bonded p electrons. The potential created by the mismatch of molecular and metal work functions leads to a partial filling of the interface states. [19][20][21] Other molecules with close electron affinity and the potential for 3d z /p coupling ...

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Interface-assisted molecular spintronics

Cited by 63 publications

References 77 publications

Structural, electronic and magnetic properties of 8-hydroxyquinoline-based small molecules TMQx (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn, and x=2 or 3)

Structural, electronic and magnetic properties of 8-hydroxyquinoline-based small molecules TMQx (TM=Cr, Mn, Fe, Co, Ni, Cu, Zn, and x=2 or 3)

Activating the molecular spinterface

Beating the Stoner criterion using molecular interfaces

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