Controlled spin switching in a metallocene molecular junction

Ormaza, Maider; Abufager, Paula; Verlhac, Benjamin; Bachellier, Nicolas; Bocquet, Marie‐Laure; Lorente, Nicolás; Limot, L.

doi:10.1038/s41467-017-02151-6

Cited by 67 publications

(117 citation statements)

References 72 publications

(77 reference statements)

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“…Given the similarity to the spin excitation spectrum measured above nickelocene [dashed line in Fig. 2(a)], which is known from previous studies [19,27], we assign 1 to a spin excitation. To confirm this assignment, we carried out spin-polarized DFT calculations (Supplemental Sec.…”

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confidence: 74%

“…For this purpose, we engineered the NiNc complex outside the network via a tip-assisted manipulation [35]. To do so, we first transferred an isolated Nc to the tip [19,27] and then transferred it back atop an isolated Ni adatom on the surface [Figs. 4(a) and 4(b)].…”

mentioning

confidence: 99%

“…4(c) is then assigned to a spin-1/2 Kondo effect, a Frota-Fano fit [36] yielding a Kondo temperature of T K = 68 ± 7 K. The Kondo effect is carried by the d xz and d yz frontier orbitals of Nc as 94% of the spin density of NiNc is located on Nc. Compared to the NiNc complex of the network, the Ni adatom likely provides a hybridization pathway to the copper surface due to its central adsorption in the Cp ring, causing the effective spin of NiNc to drop, but concomitantly promoting the Kondo physics [27].…”

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Vibron-assisted spin excitation in a magnetically anisotropic molecule

et al. 2020

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The ability to electrically-drive spin excitations in molecules with magnetic anisotropy is key for high-density storage and quantum-information technology. Electrons, however, also tunnel via the vibrational excitations unique to a molecule. The interplay of spin and vibrational excitations offers novel routes to study and, ultimately, electrically manipulate molecular magnetism. Here we use a scanning tunneling microscope to electrically induce spin and vibrational excitations in a single molecule consisting of a nickelocene magnetically coupled to a Ni atom. We evidence a vibron-assisted spin excitation at an energy one order of magnitude higher compared to the usual spin excitations of nickelocene and explain it using first-principles calculations that include electron correlations. Furthermore, we observe that spin excitations can be quenched by modifying the Ni-nickelocene coupling. Our study suggests that nickelocene-based complexes constitute a model playground for exploring the interaction of spin and vibrations in the electron transport through single magnetic molecules.Magnetic molecules are potential candidates for information-storing technology [1], molecular spintronics [2] and quantum computing [3], provided that their axial magnetic anisotropy DS 2 z ensures a magnetic bistability among longlived magnetic states. But molecules also vibrate. In particular, in magnetic molecules the interplay of vibrational modes, or vibrons, with the spin degrees of freedom is known to impact the spin lifetime [4][5][6]. Since vibrational modes can couple to the electric charge, producing vibron-assisted electron excitations in transport [7][8][9], expectations are that similar effects should be also observed with the electronic spin [10,11].Concerning this last point, experimental work has predominantly focused on a well-known spin-related manybody effect, the Kondo effect. The electron-vibron interaction in Kondo molecules was shown to produce satellite Kondo resonances in the differential conductance spectra at the bias of the vibron's excitation energy [12][13][14]. These resonances were ascribed to tunneling electrons that have their spin flipped when elastically scattering off the molecular spin, but with sufficient energy to activate a vibrational mode in the molecule [15]. The question arises whether a similar mechanism is also possible with other spin scattering mechanisms that magnetically excite a molecule such as inelastic scattering involving magnetic anisotropy [16]. These so-called spin excitations show great potential in view of an all-electrical manipulation of the molecular spin [17,18].Here, we use scanning tunneling microscopy (STM) to demonstrate the presence of a combined vibrational-spin excitation in a single nickelocene molecule [Ni(C 5 H 5 ) 2 , see Fig. 1(d); noted Nc hereafter] coupled to a Ni atom. Nickelocene is a spin S = 1 molecule of the metallocene family with magnetic anisotropy, where spin excitations produce a sizable increase of the electronic transport [19]. We show that the o...

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Vibron-assisted spin excitation in a magnetically anisotropic molecule

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“…We use here a tip decorated by a spin S = 1 nickelocene molecule ( Fig. 1a) [26,27], which comprises a Ni atom sandwiched between two C 5 H 5 cyclopentadienyl rings, and accurately capture the junction geometry through the comparison to first-principles calculations.…”

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Atomic-scale spin sensing with a single molecule at the apex of a scanning tunneling microscope

Verlhac

Bachellier

Garnier

et al. 2019

Science

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Recent advances in scanning probe techniques rely on the chemical functionalization of the probe-tip termination by a single molecule. The success of this approach opens the tantalizing prospect of introducing spin sensitivity through the functionalization by a magnetic molecule. Here, we use a nickelocene-terminated tip (Nc-tip), which offers the possibility of producing spin excitations on the tip apex of a scanning tunneling microscope (STM). We show that when the Nc-tip is a hundred pm away from point contact with a surface-supported object, magnetic effects may be probed through changes in the spin excitation spectrum of nickelocene. We use this detection scheme to simultaneously determine the exchange field and the spin polarization of the sample with atomic-scale resolution. Our findings demonstrate that the Nc-tip is a powerful probe for investigating surface magnetism with STM, from single magnetic atoms to surfaces.

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“…NO • was able to reversibly switch the spin state of the Co and Fe of porphyrins adsorbed on Ni(001) Co substrates, respectively. Similarly, NH 3 was able to induce the transition of Ni porphyrin on Co substrate from low to high spin states [99,100]. Another emerging field of spintronics is the use of antiferromagnets that are affected by spin-polarized currents.…”

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confidence: 98%

Technological Applications of Porphyrins and Related Compounds: Spintronics and Micro-/Nanomotors

Lopes¹,

Araújo-Chaves²,

Menezes³

et al. 2019

Solid State Physics [Working Title]

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The vital role played by porphyrins in cells and their use in therapeutic processes are well known. More recently, the technological applications of porphyrins have attracted the attention of researchers. Porphyrins have the property of half-metallic material, i.e., molecules that can host transition metals making feasible the production of spin-polarized electronic states at different channels. Therefore, porphyrins and hemeproteins are among the materials that have spin-filtering property to be applied in spintronics. Molecular spintronics is an emerging and highly relevant field due to their applications to the development of high-capacity informationstorage devices and quantum computers. The catalytic properties of porphyrins and related compounds such as the hemeproteins are also applicable in the fabrication of micro-/nanomotors (MNMs). In this chapter, we describe the advances and future perspectives in the technological applications of porphyrins and related compounds in spintronic devices and micro-/nanomotors.

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Controlled spin switching in a metallocene molecular junction

Cited by 67 publications

References 72 publications

Vibron-assisted spin excitation in a magnetically anisotropic molecule

Vibron-assisted spin excitation in a magnetically anisotropic molecule

Atomic-scale spin sensing with a single molecule at the apex of a scanning tunneling microscope

Technological Applications of Porphyrins and Related Compounds: Spintronics and Micro-/Nanomotors

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