Exchange interaction of strongly anisotropic tripodal erbium single-ion magnets with metallic surfaces
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Exchange interaction of strongly anisotropic tripodal erbium single-ion magnets with metallic surfaces. / Dreiser, Jan; Wäckerlin, Christian; Ali, Md. Ehesan; Piamonteze, Cinthia; Donati, Fabio; Singha, Aparajita; Pedersen, Kasper Steen; Rusponi, Stefano; Bendix, Jesper; Oppeneer, Peter M.; Jung, Thomas A.; Brune, Harald.
I: A C S Nano, Bind 8, Nr. 5, 2014, s. 4662-4671.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Exchange interaction of strongly anisotropic tripodal erbium single-ion magnets with metallic surfaces
AU - Dreiser, Jan
AU - Wäckerlin, Christian
AU - Ali, Md. Ehesan
AU - Piamonteze, Cinthia
AU - Donati, Fabio
AU - Singha, Aparajita
AU - Pedersen, Kasper Steen
AU - Rusponi, Stefano
AU - Bendix, Jesper
AU - Oppeneer, Peter M.
AU - Jung, Thomas A.
AU - Brune, Harald
PY - 2014
Y1 - 2014
N2 - We present a comprehensive study of Er(trensal) single-ion magnets deposited in ultrahigh vacuum onto metallic surfaces. X-ray photoelectron spectroscopy reveals that the molecular structure is preserved after sublimation, and that the molecules are physisorbed on Au(111) while they are chemisorbed on a Ni thin film on Cu(100) single-crystalline surfaces. X-ray magnetic circular dichroism (XMCD) measurements performed on Au(111) samples covered with molecular monolayers held at temperatures down to 4 K suggest that the easy axes of the strongly anisotropic molecules are randomly oriented. Furthermore XMCD indicates a weak antiferromagnetic exchange coupling between the single-ion magnets and the ferromagnetic Ni/Cu(100) substrate. For the latter case, spin-Hamiltonian fits to the XMCD M(H) suggest a significant structural distortion of the molecules. Scanning tunneling microscopy reveals that the molecules are mobile on Au(111) at room temperature, whereas they are more strongly attached on Ni/Cu(100). X-ray photoelectron spectroscopy results provide evidence for the chemical bonding between Er(trensal) molecules and the Ni substrate. Density functional theory calculations support these findings and, in addition, reveal the most stable adsorption configuration on Ni/Cu(100) as well as the Ni-Er exchange path. Our study suggests that the magnetic moment of Er(trensal) can be stabilized via suppression of quantum tunneling of magnetization by exchange coupling to the Ni surface atoms. Moreover, it opens up pathways toward optical addressing of surface-deposited single-ion magnets.
AB - We present a comprehensive study of Er(trensal) single-ion magnets deposited in ultrahigh vacuum onto metallic surfaces. X-ray photoelectron spectroscopy reveals that the molecular structure is preserved after sublimation, and that the molecules are physisorbed on Au(111) while they are chemisorbed on a Ni thin film on Cu(100) single-crystalline surfaces. X-ray magnetic circular dichroism (XMCD) measurements performed on Au(111) samples covered with molecular monolayers held at temperatures down to 4 K suggest that the easy axes of the strongly anisotropic molecules are randomly oriented. Furthermore XMCD indicates a weak antiferromagnetic exchange coupling between the single-ion magnets and the ferromagnetic Ni/Cu(100) substrate. For the latter case, spin-Hamiltonian fits to the XMCD M(H) suggest a significant structural distortion of the molecules. Scanning tunneling microscopy reveals that the molecules are mobile on Au(111) at room temperature, whereas they are more strongly attached on Ni/Cu(100). X-ray photoelectron spectroscopy results provide evidence for the chemical bonding between Er(trensal) molecules and the Ni substrate. Density functional theory calculations support these findings and, in addition, reveal the most stable adsorption configuration on Ni/Cu(100) as well as the Ni-Er exchange path. Our study suggests that the magnetic moment of Er(trensal) can be stabilized via suppression of quantum tunneling of magnetization by exchange coupling to the Ni surface atoms. Moreover, it opens up pathways toward optical addressing of surface-deposited single-ion magnets.
U2 - 10.1021/nn500409u
DO - 10.1021/nn500409u
M3 - Journal article
C2 - 24645922
VL - 8
SP - 4662
EP - 4671
JO - A C S Nano
JF - A C S Nano
SN - 1936-0851
IS - 5
ER -
ID: 128609716