TY  - JOUR
AU  - Singha, Aparajita
AU  - Donati, Fabio
AU  - Natterer, Fabian Donat
AU  - Wäckerlin, Christian
AU  - Stavrić, Srđan
AU  - Popović, Zoran S.
AU  - Šljivančanin, Željko
AU  - Patthey, Francois
AU  - Brune, Harald
PY  - 2018
UR  - https://link.aps.org/doi/10.1103/PhysRevLett.121.257202
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8012
AB  - We report on the magnetic properties of HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom. The dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). New for 4f elements, we detect inelastic excitations with scanning tunneling spectroscopy and prove their magnetic origin by applying an external magnetic field. In combination with density functional theory and spin Hamiltonian analysis, we determine the magnetic level distribution, as well as sign and magnitude of the exchange interaction between the two atoms. In contrast to typical 4f-3d bulk compounds, we find ferromagnetic coupling in the dimer. © 2018 American Physical Society.
T2  - Physical Review Letters
T1  - Spin Excitations in a 4f−3d Heterodimer on MgO
VL  - 121
IS  - 25
SP  - 257202
DO  - 10.1103/PhysRevLett.121.257202
ER  - 

@article{
author = "Singha, Aparajita and Donati, Fabio and Natterer, Fabian Donat and Wäckerlin, Christian and Stavrić, Srđan and Popović, Zoran S. and Šljivančanin, Željko and Patthey, Francois and Brune, Harald",
year = "2018",
abstract = "We report on the magnetic properties of HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom. The dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). New for 4f elements, we detect inelastic excitations with scanning tunneling spectroscopy and prove their magnetic origin by applying an external magnetic field. In combination with density functional theory and spin Hamiltonian analysis, we determine the magnetic level distribution, as well as sign and magnitude of the exchange interaction between the two atoms. In contrast to typical 4f-3d bulk compounds, we find ferromagnetic coupling in the dimer. © 2018 American Physical Society.",
journal = "Physical Review Letters",
title = "Spin Excitations in a 4f−3d Heterodimer on MgO",
volume = "121",
number = "25",
pages = "257202",
doi = "10.1103/PhysRevLett.121.257202"
}

Singha, A., Donati, F., Natterer, F. D., Wäckerlin, C., Stavrić, S., Popović, Z. S., Šljivančanin, Ž., Patthey, F.,& Brune, H.. (2018). Spin Excitations in a 4f−3d Heterodimer on MgO. in Physical Review Letters, 121(25), 257202.
https://doi.org/10.1103/PhysRevLett.121.257202

Singha A, Donati F, Natterer FD, Wäckerlin C, Stavrić S, Popović ZS, Šljivančanin Ž, Patthey F, Brune H. Spin Excitations in a 4f−3d Heterodimer on MgO. in Physical Review Letters. 2018;121(25):257202.
doi:10.1103/PhysRevLett.121.257202 .

Singha, Aparajita, Donati, Fabio, Natterer, Fabian Donat, Wäckerlin, Christian, Stavrić, Srđan, Popović, Zoran S., Šljivančanin, Željko, Patthey, Francois, Brune, Harald, "Spin Excitations in a 4f−3d Heterodimer on MgO" in Physical Review Letters, 121, no. 25 (2018):257202,
https://doi.org/10.1103/PhysRevLett.121.257202 . .

TY  - JOUR
AU  - Fernandes, Edgar
AU  - Donati, Fabio
AU  - Patthey, Francois
AU  - Stavrić, Srđan
AU  - Šljivančanin, Željko
AU  - Brune, Harald
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1645
AB  - We use Ca doping during growth of one-and two-monolayer-thick MgO films on Ag(100) to identify the adsorption sites of individual adatoms with scanning tunneling microscopy. For this we combine atomic resolution images of the bare MgO layer with images of the adsorbates and the substitutional Ca atoms taken at larger tip-sample distance. For Ho atoms, the adsorption sites depend on MgO thickness. On the monolayer, they are distributed on the O and bridge sites according to the abundance of those sites, 1/3 and 2/3, respectively. On the MgO bilayer, Ho atoms populate almost exclusively the O site. A third species adsorbed on Mg is predicted by density functional theory and can be created by atomic manipulation. Au atoms adsorb on the bridge sites for both MgO thicknesses, while Co and Fe atoms prefer the O sites, again for both thicknesses.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Adsorption sites of individual metal atoms on ultrathin MgO(100) films
VL  - 96
IS  - 4
DO  - 10.1103/PhysRevB.96.045419
ER  - 

@article{
author = "Fernandes, Edgar and Donati, Fabio and Patthey, Francois and Stavrić, Srđan and Šljivančanin, Željko and Brune, Harald",
year = "2017",
abstract = "We use Ca doping during growth of one-and two-monolayer-thick MgO films on Ag(100) to identify the adsorption sites of individual adatoms with scanning tunneling microscopy. For this we combine atomic resolution images of the bare MgO layer with images of the adsorbates and the substitutional Ca atoms taken at larger tip-sample distance. For Ho atoms, the adsorption sites depend on MgO thickness. On the monolayer, they are distributed on the O and bridge sites according to the abundance of those sites, 1/3 and 2/3, respectively. On the MgO bilayer, Ho atoms populate almost exclusively the O site. A third species adsorbed on Mg is predicted by density functional theory and can be created by atomic manipulation. Au atoms adsorb on the bridge sites for both MgO thicknesses, while Co and Fe atoms prefer the O sites, again for both thicknesses.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Adsorption sites of individual metal atoms on ultrathin MgO(100) films",
volume = "96",
number = "4",
doi = "10.1103/PhysRevB.96.045419"
}

Fernandes, E., Donati, F., Patthey, F., Stavrić, S., Šljivančanin, Ž.,& Brune, H.. (2017). Adsorption sites of individual metal atoms on ultrathin MgO(100) films. in Physical Review B: Condensed Matter and Materials Physics, 96(4).
https://doi.org/10.1103/PhysRevB.96.045419

Fernandes E, Donati F, Patthey F, Stavrić S, Šljivančanin Ž, Brune H. Adsorption sites of individual metal atoms on ultrathin MgO(100) films. in Physical Review B: Condensed Matter and Materials Physics. 2017;96(4).
doi:10.1103/PhysRevB.96.045419 .

Fernandes, Edgar, Donati, Fabio, Patthey, Francois, Stavrić, Srđan, Šljivančanin, Željko, Brune, Harald, "Adsorption sites of individual metal atoms on ultrathin MgO(100) films" in Physical Review B: Condensed Matter and Materials Physics, 96, no. 4 (2017),
https://doi.org/10.1103/PhysRevB.96.045419 . .

TY  - JOUR
AU  - Donati, Fabio
AU  - Rusponi, S.
AU  - Stepanow, S.
AU  - Waeckerlin, C.
AU  - Singha, Aparajita
AU  - Persichetti, L.
AU  - Baltic, R.
AU  - Diller, K.
AU  - Patthey, Francois
AU  - Fernandes, E.
AU  - Dreiser, J.
AU  - Šljivančanin, Željko
AU  - Kummer, K.
AU  - Nistor, C.
AU  - Gambardella, P.
AU  - Brune, Harald
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1012
AB  - A permanent magnet retains a substantial fraction of its saturation magnetization in the absence of an external magnetic field. Realizing magnetic remanence in a single atom allows for storing and processing information in the smallest unit of matter. We show that individual holmium (Ho) atoms adsorbed on ultrathin MgO(100) layers on Ag(100) exhibit magnetic remanence up to a temperature of 30 kelvin and a relaxation time of 1500 seconds at 10 kelvin. This extraordinary stability is achieved by the realization of a symmetry-protected magnetic ground state and by decoupling the Ho spin from the underlying metal by a tunnel barrier.
T2  - Science
T1  - Magnetic remanence in single atoms
VL  - 352
IS  - 6283
SP  - 318
EP  - 321
DO  - 10.1126/science.aad9898
ER  - 

@article{
author = "Donati, Fabio and Rusponi, S. and Stepanow, S. and Waeckerlin, C. and Singha, Aparajita and Persichetti, L. and Baltic, R. and Diller, K. and Patthey, Francois and Fernandes, E. and Dreiser, J. and Šljivančanin, Željko and Kummer, K. and Nistor, C. and Gambardella, P. and Brune, Harald",
year = "2016",
abstract = "A permanent magnet retains a substantial fraction of its saturation magnetization in the absence of an external magnetic field. Realizing magnetic remanence in a single atom allows for storing and processing information in the smallest unit of matter. We show that individual holmium (Ho) atoms adsorbed on ultrathin MgO(100) layers on Ag(100) exhibit magnetic remanence up to a temperature of 30 kelvin and a relaxation time of 1500 seconds at 10 kelvin. This extraordinary stability is achieved by the realization of a symmetry-protected magnetic ground state and by decoupling the Ho spin from the underlying metal by a tunnel barrier.",
journal = "Science",
title = "Magnetic remanence in single atoms",
volume = "352",
number = "6283",
pages = "318-321",
doi = "10.1126/science.aad9898"
}

Donati, F., Rusponi, S., Stepanow, S., Waeckerlin, C., Singha, A., Persichetti, L., Baltic, R., Diller, K., Patthey, F., Fernandes, E., Dreiser, J., Šljivančanin, Ž., Kummer, K., Nistor, C., Gambardella, P.,& Brune, H.. (2016). Magnetic remanence in single atoms. in Science, 352(6283), 318-321.
https://doi.org/10.1126/science.aad9898

Donati F, Rusponi S, Stepanow S, Waeckerlin C, Singha A, Persichetti L, Baltic R, Diller K, Patthey F, Fernandes E, Dreiser J, Šljivančanin Ž, Kummer K, Nistor C, Gambardella P, Brune H. Magnetic remanence in single atoms. in Science. 2016;352(6283):318-321.
doi:10.1126/science.aad9898 .

Donati, Fabio, Rusponi, S., Stepanow, S., Waeckerlin, C., Singha, Aparajita, Persichetti, L., Baltic, R., Diller, K., Patthey, Francois, Fernandes, E., Dreiser, J., Šljivančanin, Željko, Kummer, K., Nistor, C., Gambardella, P., Brune, Harald, "Magnetic remanence in single atoms" in Science, 352, no. 6283 (2016):318-321,
https://doi.org/10.1126/science.aad9898 . .