Tuning the Magnetic Anisotropy at a Molecule-Metal Interface

Bairagi, Kaushik; Bellec, Amandine; Repain, Vincent; Chacon, Cyril; Girard, Yann; Garreau, Y.; Lagoute, Jérôme; Rousset, Sylvie; Breitwieser, R.; Hu, Yu-Cheng; Chao, Yen Cheng; Pai, Woei Wu; Li, Dongzhe; Smogunov, Alexander; Barreteau, Cyrille

doi:10.1103/physrevlett.114.247203

Cited by 119 publications

(145 citation statements)

References 18 publications

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“…The impact of carbon-based molecules on adjacent ferromagnets is not limited to spin filtering and electronic transport, but extends to induced changes in the metal anisotropy, magnetization, coercivity, and bias (12)(13)(14). Charge transfer and d(metal)-π(carbon) orbital coupling at the interface may change the density of states, spin population, and exchange of metallocarbon interfaces (4,15,16).…”

mentioning

confidence: 99%

Emergent magnetism at transition-metal–nanocarbon interfaces

Ma’Mari

Rogers

Alghamdi

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Charge transfer at metallo-molecular interfaces may be used to design multifunctional hybrids with an emergent magnetization that may offer an eco-friendly and tunable alternative to conventional magnets and devices. Here, we investigate the origin of the magnetism arising at these interfaces by using different techniques to probe 3d and 5d metal films such as Sc, Mn, Cu, and Pt in contact with fullerenes and rf-sputtered carbon layers. These systems exhibit small anisotropy and coercivity together with a high Curie point. Low-energy muon spin spectroscopy in Cu and Sc-C 60 multilayers show a quick spin depolarization and oscillations attributed to nonuniform local magnetic fields close to the metallo-carbon interface. The hybridization state of the carbon layers plays a crucial role, and we observe an increased magnetization as sp 3 orbitals are annealed into sp 2 −π graphitic states in sputtered carbon/copper multilayers. X-ray magnetic circular dichroism (XMCD) measurements at the carbon K edge of C 60 layers in contact with Sc films show spin polarization in the lowest unoccupied molecular orbital (LUMO) and higher π*-molecular levels, whereas the dichroism in the σ*-resonances is small or nonexistent. These results support the idea of an interaction mediated via charge transfer from the metal and dz-π hybridization. Thin-film carbon-based magnets may allow for the manipulation of spin ordering at metallic surfaces using electrooptical signals, with potential applications in computing, sensors, and other multifunctional magnetic devices. emergent magnetism | molecular spintronics | interfacial magnetism | charge transfer | nanocarbon I nterfaces are critical in quantum physics, and therefore we must explore the potential for designer hybrid materials that profit from promising combinatory effects. In particular, the fine-tuning of spin polarization at metallo-organic interfaces opens a realm of possibilities, from the direct applications in molecular spintronics and thin-film magnetism to biomedical imaging or quantum computing. This interaction at the surface can control the spin polarization in magnetic field sensors, generate magnetization spin-filtering effects in nonmagnetic electrodes, or even give rise to a spontaneous spin ordering in nonmagnetic elements such as diamagnetic copper and paramagnetic manganese (1-11).The impact of carbon-based molecules on adjacent ferromagnets is not limited to spin filtering and electronic transport, but extends to induced changes in the metal anisotropy, magnetization, coercivity, and bias (12-14). Charge transfer and d(metal)-π(carbon) orbital coupling at the interface may change the density of states, spin population, and exchange of metallocarbon interfaces (4,15,16). The interaction between the molecule and the metal depends strongly on the morphology and specific molecular geometry (17, 18). It may lead to a change in the density of states at the Fermi energy DOS(E F ) and/or the exchange-correlation integral (I s ) as described by the Stoner criterion for ferr...

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mentioning

confidence: 99%

Emergent magnetism at transition-metal–nanocarbon interfaces

Ma’Mari

Rogers

Alghamdi

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Together with other new methods for probing single-molecule spin states [5,[8][9][10][11][12], control and read-out of single molecules and atoms is possible. Experiments on single magnetic atoms and molecules show distance dependent effects in their exchange [13][14][15][16], large anisotropy of individual molecules [17][18][19][20], as well as collective spin excitations and Kondo effect [21][22][23][24]. Recent experimental progress show long-time stability of the spin state of individual atoms on a surface [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Transient spin dynamics in a single-molecule magnet

Hammar

Fransson

2017

Phys. Rev. B

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We explore the limitations and validity of semi-classically formulated spin equations of motion. Using a single-molecule magnet as a test model, we employ three qualitatively different approximation schemes. From a microscopic model, we derive a generalized spin equation of motion in which the parameters have a non-local time-dependence. This dynamical equation is simplified to the Landau-Lifshitz-Gilbert equation with i) timedependent, and ii) time-independent parameters. We show that transient dynamics is essentially non-existing in the latter approximation, while the former breaks down in the regime of strong coupling between the spin and the itinerant electrons.

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“…For example, it has been shown that the magnetic properties of Co thin films, such as saturation magnetization, coercivity, and magnetic anisotropy, are strongly affected by interface formation with C 60 molecules [113,114]. Kawahara et al performed ST-SPM measurements on C 60 molecules adsorbed on magnetic Cr(001), showing that spin-split hybrid orbitals are formed [90].…”

Section: Spin Dependent Effects At Hybrid Interfacesmentioning

confidence: 99%

Recent progress in organic spintronics

Jong

2016

Open Physics

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Abstract:The field of organic spintronics deals with spin dependent phenomena occurring in organic semiconductors or hybrid inorganic/organic systems that may be exploited for future electronic applications. This includes magnetic field effects on charge transport and luminescence in organic semiconductors, spin valve action in devices comprising organic spacers, and magnetic effects that are unique to hybrid interfaces between (ferromagnetic) metals and organic molecules. A brief overview of the current state of affairs in the field is presented.

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Tuning the Magnetic Anisotropy at a Molecule-Metal Interface

Cited by 119 publications

References 18 publications

Emergent magnetism at transition-metal–nanocarbon interfaces

Emergent magnetism at transition-metal–nanocarbon interfaces

Transient spin dynamics in a single-molecule magnet

Recent progress in organic spintronics

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