Highly spin-polarized carbon-based spinterfaces

Djeghloul, F.; Garreau, G.; Gruber, Manuel; Joly, L.; Boukari, S.; Arabski, J.; Bulou, Hervé; Scheurer, F.; Hallal, Ali; Bertran, F.; Fèvre, P. Le; Taleb‐Ibrahimi, A.; Wulfhekel, Wulf; Beaurepaire, E.; Hajjar‐Garreau, Samar; Wetzel, P.; Bowen, M.; Weber, W.

doi:10.1016/j.carbon.2015.02.043

Cited by 25 publications

(52 citation statements)

References 29 publications

(38 reference statements)

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“…To obtain RT electrical generation, and in the process demonstrate it to be a RT spintronic selector, we utilize the spinterface 13,14,25,26 . This refers to a low energy bandwidth, low density of highly spin-polarized states that arise at room temperature from spin-polarized hybridization between the highly degenerate electronic states of a FM metal such as Co and the few, energetically discrete states of molecules, including carbon atoms 26 . The spinterface is weakly conducting, and its magnetic orientation naturally follows that of the FM metal.…”

Section: Resultsmentioning

confidence: 99%

“…The spinterface is weakly conducting, and its magnetic orientation naturally follows that of the FM metal. To date, only spin-polarized photoemission spectroscopy 14,26 suggests that the spinterface may be a spintronic selector at RT. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1 A room-temperature spin engine. a Illustration of asymmetries in the spin-induced transmission rates Γ across a single paramagnetic (PM) center between spintronic selectors L and R. Spinterfaces 13,14,25,26 , halfmetals 15,17 , Fe/MgO MTJs 20,22 , and ferromagnetic tunnel barriers 19 can fulfill the role of a spintronic selector. b Spin-conserved quantum tunneling between a spinterface and a PM center deforms the PM center's Bloch sphere, thereby splitting 27,28 its spin states by Δ, and shifts the spinterface's Fermi level (E F ) by Δϕ.…”

Section: Resultsmentioning

confidence: 99%

“…With the support of analytical and ab-initio theories, we believe to have observed an experimental realization of this spin engine through measurements across a single MgO MTJ at room temperature (RT; see junction statistics in Supplementary Note 3). As described hereafter, this MTJ integrates Co/C spinterfaces with nearly total spin polarization 26 , and paramagnetic C atoms 31 on the oxygen vacancy sites of the MgO tunnel barrier. Referring to MTJ, the direction of static current flow can be reversed by simply switching the MTJ's spintronic state.…”

Section: Resultsmentioning

confidence: 99%

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Spin-driven electrical power generation at room temperature

et al. 2019

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Ongoing research is exploring novel energy concepts ranging from classical to quantum thermodynamics. Ferromagnets carry substantial built-in energy due to ordered electron spins. Here, we propose to generate electrical power at room temperature by utilizing this magnetic energy to harvest thermal fluctuations on paramagnetic centers using spintronics. Our spin engine rectifies current fluctuations across the paramagnetic centers' spin states by utilizing so-called 'spinterfaces' with high spin polarization. Analytical and ab-initio theories suggest that experimental data at room temperature from a single MgO magnetic tunnel junction (MTJ) be linked to this spin engine. Device downscaling, other spintronic solutions to select a transport spin channel, and dual oxide/organic materials tracks to introduce paramagnetic centers into the tunnel barrier, widen opportunities for routine device reproduction. At present MgO MTJ densities in next-generation memories, this spin engine could lead to 'always-on' areal power densities that are highly competitive relative to other energy harvesting strategies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Spin-driven electrical power generation at room temperature

et al. 2019

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“…They disappear a very short time later [20][21][22]. Recently, magnetization was induced in Cu/C 60 interfaces [23], and strongly spin-polarized interfaces at room temperature in ultra-thin a-C layers on FM cobalt have been reported [24]. In addition, scanning tunneling microscopy (STM) results showed that biological retinoic acid (which comprising only carbon, oxygen and hydrogen atoms) physically adsorbed on an inert gold surface may exhibit a localized magnetic state [25].…”

Section: Introductionmentioning

confidence: 99%

Peculiar Magnetic Features and Superconductivity in Sulfur Doped Amorphous Carbon

Felner

2016

Magnetochemistry

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Abstract:We report on magnetic studies of inhomogeneous commercial and synthesized amorphous carbon (a-C) and a-C doped with sulfur (a-CS) powders which exhibit (i) peculiar magnetic behavior and (ii) traces of two superconducting (SC) phases T C~3 3 and at 65 K. (i) The temperature dependence of zero-field-cooled (ZFC) curves measured up to room temperature show well distinguished elusive peaks at around 50-80 K, and their origin is not yet known. These peaks are totally washed-out in the second ZFC sweeps and in the FC branches as well. As a result, in the vicinity of the peaks, the FC curves lie below the ZFC peaks (FC < ZFC), a phenomenon which is rarely observed. These magnetic anomalies are intrinsic properties of a-C and a-CS materials (ii) SC was observed in three different a-C sources: (a) The commercial a-C powder contains 0.21% of sulfur and it is suggested that two different a-CS phases (at 33 and 65 K) are the origin of the two SC states observed. The compositions of these two phases are not yet unknown. The small SC volume fractions of the 33 K phase can be enhanced by a solid reaction with additional sulfur at 250 • C; (b) the synthesized (a-C) powder (obtained from decomposition of sucrose) is not SC. However, when mixed with sulfur and heated at 400 • C under a protective atmosphere, the a-CS powder obtained also show traces of a SC phase at T C = 42 K; (c) The same occurs in a-C thin films. The as-grown films are not SC but a SC phase at T C = 34 K emerges after the films were reacted with sulfur at elevated temperatures. It is concluded, therefore, that all SC phases observed are due to different unknown a-CS phases. Since the a-C and a-CS powders possess SC and magnetic states, we believe that these powders resemble the high T C curates and Fe-As based systems in which the SC and the magnetic states are closely related to each other.

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Modulating the Ferromagnet/Molecule Spin Hybridization Using an Artificial Magnetoelectric

Studniarek

Cherifi‐Hertel

Urbain

et al. 2017

Adv Funct Materials

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Spin‐polarized charge transfer at the interface between a ferromagnetic (FM) metal and a molecule can lead to ferromagnetic coupling and to a high spin polarization at room temperature. The magnetic properties of these interfaces can not only alter those of the ferromagnet but can also stabilize molecular spin chains with interesting opportunities toward quantum computing. With the aim to enhance an organic spintronic device's functionality, external control over this spin polarization may thus be achieved by altering the ferromagnet/molecule interface's magnetic properties. To do so, the magnetoelectric properties of an underlying ferroelectric/ferromagnetic interface are utilized. Switching the ferroelectric polarization state of a PbZr0.2Ti0.8O3 (PZT) bottom layer within a PZT/Co/FePc‐based (Pc ‐ phthalocyanine) device alters the X‐ray magnetic circular dichroism of the Fe site within the phthalocyanine molecular top layer. Thus, how to electrically alter the magnetic properties of an interface with high spin polarization at room temperature is demonstrated. This expands electrical control over spin‐polarized FM/molecule interfaces, which is first demonstrated using ferroelectric molecules, to all molecular classes.

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Highly spin-polarized carbon-based spinterfaces

Cited by 25 publications

References 29 publications

Spin-driven electrical power generation at room temperature

Spin-driven electrical power generation at room temperature

Peculiar Magnetic Features and Superconductivity in Sulfur Doped Amorphous Carbon

Modulating the Ferromagnet/Molecule Spin Hybridization Using an Artificial Magnetoelectric

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