Observation and electric current control of a local spin in a single-molecule magnet

Komeda, Tadahiro; Isshiki, Hironari; Liu, Jie; Zhang, Yan Feng; Lorente, Nicolás; Katoh, Keiichi; Breedlove, Brian K.; Yamashita, Masahiro

doi:10.1038/ncomms1210

Cited by 393 publications

(447 citation statements)

References 43 publications

Supporting

Mentioning

411

Contrasting

Unclassified

Order By: Relevance

“…Our observations thus indicate that the screened spin is not localized on the metal ion, contrary to conclusions generally drawn from molecular junction experiments [1][2][3] and studies of metal-organic complexes at surfaces 16,18,19,23,24 , but induced by charge transfer into molecular ligand states 13,[25][26][27][28] , independently of the spin of the pristine molecules.…”

Section: I/dvcontrasting

confidence: 56%

Spin coupling and relaxation inside molecule–metal contacts

et al. 2011

View full text Add to dashboard Cite

Advances in molecular electronics depend on the ability to control the charge and spin of single molecules at the interface with a metal. Here we show that bonding of metal-organic complexes to a metallic substrate induces the formation of coupled metal-ligand spin states, increasing the spin degeneracy of the molecules and opening multiple spin relaxation channels. scanning tunnelling spectroscopy reveals the sign and magnitude of intramolecular exchange coupling as well as the orbital character of the spin-polarized molecular states. We observe coexisting Kondo, spin, and vibrational inelastic channels in a single molecule, which lead to pronounced intramolecular variations of the conductance and spin dynamics. The spin degeneracy of the molecules can be controlled by artificially fabricating molecular clusters of different size and shape. By comparing data for vibronic and spin-exchange excitations, we provide a positive test of the universal scaling properties of inelastic Kondo processes having different physical origin.

show abstract

Section: I/dvcontrasting

confidence: 56%

Spin coupling and relaxation inside molecule–metal contacts

et al. 2011

View full text Add to dashboard Cite

show abstract

“…discussion of our STM and X-ray linear dichroism (XLD) data below). [ 6,27 ] This excludes that the extraordinary magnetic properties observed in this study are due to upstanding molecules having their macrocycles perpendicular to the surface, which would lead to a reduced interaction of the Tb(III) ion with the surface. The high-resolution image in Figure 1 c reveals eight lobes per molecule, reminiscent of the staggered conformation of the two phthalocyanine ligands.…”

Section: Doi: 101002/adma201506305mentioning

confidence: 85%

“…The high-resolution image in Figure 1 c reveals eight lobes per molecule, reminiscent of the staggered conformation of the two phthalocyanine ligands. [ 27 ] Islands with the identical molecular assembly are formed by TbPc 2 adsorbed directly onto Ag(100), as shown in the Supporting Information.The magnetic properties of the Tb(III) ions in the surfaceadsorbed SMMs are determined by X-ray magnetic circular dichroism (XMCD) measurements at the M 4,5 (3 d → 4 f ) edges of Tb. For sub-MLs of TbPc 2 on MgO we fi nd a strong remanence larger than 40% of the saturation magnetization sat M and Single-molecule magnets (SMMs) [ 1 ] are very promising for molecular spintronics [ 2 ] and quantum information processing, [ 3 ] because of their magnetic bistability and the quantum nature of their spin.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Giant Hysteresis of Single‐Molecule Magnets Adsorbed on a Nonmagnetic Insulator

et al. 2016

View full text Add to dashboard Cite

metal electrode. We use nonmagnetic, insulating MgO, wellknown in inorganic spintronic applications, [ 17,18 ] which allows to control the electron tunneling rate over many orders of magnitude. [ 19 ] Moreover, we employ the TbPc 2 SMM [ 14,15,[20][21][22][23] as a model system. In the neutral molecule, the Tb(III) ion exhibits an electronic spin state of J = 6. It is sandwiched between two phthalocyanine (Pc) macrocycles (cf. schematic view in Figure 1 a) hosting an unpaired electron delocalized over the Pc ligands. The easy-axis-type magnetic anisotropy imposes an energy barrier of ≈65 meV for magnetization reversal, [ 23 ] which is largest within the whole series of lanthanide-Pc 2 SMMs. [ 14,15 ] On nonmagnetic conducting substrates, only vanishing remanence [6][7][8][9][10] and very narrow hysteresis loops [6][7][8][9] were observed, much smaller than in bulk measurements, [ 20 ] illustrating the disruptive effects of the surface. We note that the adsorption of TbPc 2 on (anti)ferromagnetic materials represents a different situation because of the magnetic exchange interaction with the substrate. [ 24,25 ] In those cases, the SMMs were not shown to exhibit slow relaxation of magnetization. Rather, the hysteresis is linked to the one of the magnetic substrates, i.e., it is not an intrinsic property of the SMMs. Overall, the detailed knowledge on TbPc 2 makes it an ideal candidate to test if a tunnel barrier can boost the magnetic properties of surface-adsorbed SMMs. In this communication we show that the magnetic remanence and hysteresis opening obtained with TbPc 2 on MgO tunnel barriers outperform the ones of any other surface-adsorbed SMM [4][5][6][7][8][9][10][11][12][13]26 ] as well as those of bulk samples of TbPc 2 . [ 20 ] The scanning tunneling microscopy (STM) images in Figure 1 b,c show that TbPc 2 self-assembles by forming perfectly ordered 2D islands on two monolayers (MLs) of MgO on Ag(100). In line with former results, the SMMs are adsorbed fl at on the surface (cf. discussion of our STM and X-ray linear dichroism (XLD) data below). [ 6,27 ] This excludes that the extraordinary magnetic properties observed in this study are due to upstanding molecules having their macrocycles perpendicular to the surface, which would lead to a reduced interaction of the Tb(III) ion with the surface. The high-resolution image in Figure 1 c reveals eight lobes per molecule, reminiscent of the staggered conformation of the two phthalocyanine ligands. [ 27 ] Islands with the identical molecular assembly are formed by TbPc 2 adsorbed directly onto Ag(100), as shown in the Supporting Information.The magnetic properties of the Tb(III) ions in the surfaceadsorbed SMMs are determined by X-ray magnetic circular dichroism (XMCD) measurements at the M 4,5 (3 d → 4 f ) edges of Tb. For sub-MLs of TbPc 2 on MgO we fi nd a strong remanence larger than 40% of the saturation magnetization sat M and Single-molecule magnets (SMMs) [ 1 ] are very promising for molecular spintronics [ 2 ] and quantum information processing, [...

show abstract

“…S ingle-molecule magnets (SMM) exhibit new properties such as electric control of molecular spin states 1 , remarkably high blocking temperatures, hysteresis 2 , quantum tunnelling of magnetization 3,4 , and tunable coupling to magnetic substrates 5 . Recently, the realization of novel devices, such as multiplefield-effect nanotransistors 6 or supramolecular spin valves 7 has been reported, demonstrating the potential of SMMs for technological applications, in particular spintronics 8 and quantum computing 9,10 .…”

mentioning

confidence: 99%

Real-space observation of spin-split molecular orbitals of adsorbed single-molecule magnets

Schwöbel¹,

Fu²,

Brede³

et al. 2012

Nat Commun

140

114

View full text Add to dashboard Cite

A key challenge in the field of molecular spintronics, and for the design of single-molecule magnet-based devices in particular, is the understanding and control of the molecular coupling at the electrode interfaces. It was demonstrated for the field of molecular electronics that the characterization of the molecule-metal-interface requires the precise knowledge of the atomic environment as well as the molecular orbitals being involved in electron transport. To extend the field of molecular electronics towards molecular spintronics, it is of utmost importance to resolve the spin character of molecular orbitals interacting with ferromagnetic leads. Here we present first direct real-space images of spin-split molecular orbitals of a single-molecule magnet adsorbed on a ferromagnetic nanostructure. moreover, we are able to determine quantitatively the magnitude of the spin-splitting as well as the charge state of the adsorbed molecule.

show abstract

Observation and electric current control of a local spin in a single-molecule magnet

Cited by 393 publications

References 43 publications

Spin coupling and relaxation inside molecule–metal contacts

Spin coupling and relaxation inside molecule–metal contacts

Giant Hysteresis of Single‐Molecule Magnets Adsorbed on a Nonmagnetic Insulator

Real-space observation of spin-split molecular orbitals of adsorbed single-molecule magnets

Contact Info

Product

Resources

About