Tuning the kondo effect in thin Au films by depositing a thin layer of Au on molecular spin-dopants

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Abstract

We report on the tuning of the Kondo effect in thin Au films containing a monolayer of cobalt(II) terpyridine complexes by altering the ligand structure around the Co2+ ions by depositing a thin Au capping layer on top of the monolayer on Au by magnetron sputtering (more energetic) and e-beam evaporation (softer). We show that the Kondo effect is slightly enhanced with respect to that of the uncapped film when the cap is deposited by evaporation, and significantly enhanced when magnetron sputtering is used. The Kondo temperature (T-K) increases from 3 to 4.2/6.2 K for the evaporated/sputtered caps. X-ray absorption spectroscopy and surface-enhanced Raman spectroscopy investigation showed that the organic ligands remain intact upon Au e-beam evaporation; however, sputtering inflicts significant change in the Co2+ electronic environment. The location of the monolayer-on the surface or embedded in the film-has a small effect. However, the damage of Co-N bonds induced by sputtering has a drastic effect on the increase of the impurity-electron interaction. This opens up the way for tuning of the magnetic impurity states, e.g. spin quantum number, binding energy with respect to the host Fermi energy, and overlap via the ligand structure around the ions.
Original languageUndefined
Pages (from-to)375204
Number of pages8
JournalNanotechnology
Volume24
Issue number37
DOIs
Publication statusPublished - 20 Sep 2013

Keywords

  • Terpyridine
  • Spectroscopy
  • EWI-24395
  • Metal
  • X-ray absorption
  • Hybrid
  • Monolayers
  • Graphene
  • Magnetron sputtering system
  • Complexes
  • Adsorption
  • IR-89180
  • METIS-298251

Cite this

@article{8a867f4c642f411d9fb6558da302479f,
title = "Tuning the kondo effect in thin Au films by depositing a thin layer of Au on molecular spin-dopants",
abstract = "We report on the tuning of the Kondo effect in thin Au films containing a monolayer of cobalt(II) terpyridine complexes by altering the ligand structure around the Co2+ ions by depositing a thin Au capping layer on top of the monolayer on Au by magnetron sputtering (more energetic) and e-beam evaporation (softer). We show that the Kondo effect is slightly enhanced with respect to that of the uncapped film when the cap is deposited by evaporation, and significantly enhanced when magnetron sputtering is used. The Kondo temperature (T-K) increases from 3 to 4.2/6.2 K for the evaporated/sputtered caps. X-ray absorption spectroscopy and surface-enhanced Raman spectroscopy investigation showed that the organic ligands remain intact upon Au e-beam evaporation; however, sputtering inflicts significant change in the Co2+ electronic environment. The location of the monolayer-on the surface or embedded in the film-has a small effect. However, the damage of Co-N bonds induced by sputtering has a drastic effect on the increase of the impurity-electron interaction. This opens up the way for tuning of the magnetic impurity states, e.g. spin quantum number, binding energy with respect to the host Fermi energy, and overlap via the ligand structure around the ions.",
keywords = "Terpyridine, Spectroscopy, EWI-24395, Metal, X-ray absorption, Hybrid, Monolayers, Graphene, Magnetron sputtering system, Complexes, Adsorption, IR-89180, METIS-298251",
author = "Derya Ata{\cc} and T. Gang and M.D. Yilmaz and Saurabh Bose and Lenferink, {Aufrid T.M.} and Cornelis Otto and {de Jong}, {Machiel Pieter} and Jurriaan Huskens and {van der Wiel}, {Wilfred Gerard}",
year = "2013",
month = "9",
day = "20",
doi = "10.1088/0957-4484/24/37/375204",
language = "Undefined",
volume = "24",
pages = "375204",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing Ltd.",
number = "37",

}

Tuning the kondo effect in thin Au films by depositing a thin layer of Au on molecular spin-dopants. / Ataç, Derya; Gang, T.; Yilmaz, M.D.; Bose, Saurabh; Lenferink, Aufrid T.M.; Otto, Cornelis; de Jong, Machiel Pieter; Huskens, Jurriaan; van der Wiel, Wilfred Gerard.

In: Nanotechnology, Vol. 24, No. 37, 20.09.2013, p. 375204.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Tuning the kondo effect in thin Au films by depositing a thin layer of Au on molecular spin-dopants

AU - Ataç, Derya

AU - Gang, T.

AU - Yilmaz, M.D.

AU - Bose, Saurabh

AU - Lenferink, Aufrid T.M.

AU - Otto, Cornelis

AU - de Jong, Machiel Pieter

AU - Huskens, Jurriaan

AU - van der Wiel, Wilfred Gerard

PY - 2013/9/20

Y1 - 2013/9/20

N2 - We report on the tuning of the Kondo effect in thin Au films containing a monolayer of cobalt(II) terpyridine complexes by altering the ligand structure around the Co2+ ions by depositing a thin Au capping layer on top of the monolayer on Au by magnetron sputtering (more energetic) and e-beam evaporation (softer). We show that the Kondo effect is slightly enhanced with respect to that of the uncapped film when the cap is deposited by evaporation, and significantly enhanced when magnetron sputtering is used. The Kondo temperature (T-K) increases from 3 to 4.2/6.2 K for the evaporated/sputtered caps. X-ray absorption spectroscopy and surface-enhanced Raman spectroscopy investigation showed that the organic ligands remain intact upon Au e-beam evaporation; however, sputtering inflicts significant change in the Co2+ electronic environment. The location of the monolayer-on the surface or embedded in the film-has a small effect. However, the damage of Co-N bonds induced by sputtering has a drastic effect on the increase of the impurity-electron interaction. This opens up the way for tuning of the magnetic impurity states, e.g. spin quantum number, binding energy with respect to the host Fermi energy, and overlap via the ligand structure around the ions.

AB - We report on the tuning of the Kondo effect in thin Au films containing a monolayer of cobalt(II) terpyridine complexes by altering the ligand structure around the Co2+ ions by depositing a thin Au capping layer on top of the monolayer on Au by magnetron sputtering (more energetic) and e-beam evaporation (softer). We show that the Kondo effect is slightly enhanced with respect to that of the uncapped film when the cap is deposited by evaporation, and significantly enhanced when magnetron sputtering is used. The Kondo temperature (T-K) increases from 3 to 4.2/6.2 K for the evaporated/sputtered caps. X-ray absorption spectroscopy and surface-enhanced Raman spectroscopy investigation showed that the organic ligands remain intact upon Au e-beam evaporation; however, sputtering inflicts significant change in the Co2+ electronic environment. The location of the monolayer-on the surface or embedded in the film-has a small effect. However, the damage of Co-N bonds induced by sputtering has a drastic effect on the increase of the impurity-electron interaction. This opens up the way for tuning of the magnetic impurity states, e.g. spin quantum number, binding energy with respect to the host Fermi energy, and overlap via the ligand structure around the ions.

KW - Terpyridine

KW - Spectroscopy

KW - EWI-24395

KW - Metal

KW - X-ray absorption

KW - Hybrid

KW - Monolayers

KW - Graphene

KW - Magnetron sputtering system

KW - Complexes

KW - Adsorption

KW - IR-89180

KW - METIS-298251

U2 - 10.1088/0957-4484/24/37/375204

DO - 10.1088/0957-4484/24/37/375204

M3 - Article

VL - 24

SP - 375204

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 37

ER -