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Gadolinium as an accelerator for reaching thermal equilibrium and its influence on the ground state of Dy2GdN@ C80 single-molecule magnets

Kostanyan, Aram ; Schlesier, Christin ; Westerström, Rasmus LU ; Dreiser, Jan ; Fritz, Fabian ; Büchner, Bernd ; Popov, Alexey A. ; Piamonteze, Cinthia and Greber, Thomas (2021) In Physical Review B 103(1).
Abstract

Endohedral fullerenes are perfect nanolaboratories for the study of magnetism. The substitution of a diamagnetic scandium atom in Dy2ScN@C80 with gadolinium decreases the stability of a given magnetization and demonstrates Gd to act as a single atom catalyst that accelerates the reaching of thermal equilibrium. X-ray magnetic circular dichroism at the M4,5 edges of Gd and Dy shows that Gd affects the ground state. The Gd magnetic moment follows the sum of the external and the dipolar magnetic field of the two Dy ions and compared to Dy2ScN@C80 a lower exchange barrier is found between the ferromagnetic and the antiferromagnetic Dy configuration. The Arrhenius equilibration barrier as obtained from superconducting quantum interference... (More)

Endohedral fullerenes are perfect nanolaboratories for the study of magnetism. The substitution of a diamagnetic scandium atom in Dy2ScN@C80 with gadolinium decreases the stability of a given magnetization and demonstrates Gd to act as a single atom catalyst that accelerates the reaching of thermal equilibrium. X-ray magnetic circular dichroism at the M4,5 edges of Gd and Dy shows that Gd affects the ground state. The Gd magnetic moment follows the sum of the external and the dipolar magnetic field of the two Dy ions and compared to Dy2ScN@C80 a lower exchange barrier is found between the ferromagnetic and the antiferromagnetic Dy configuration. The Arrhenius equilibration barrier as obtained from superconducting quantum interference device magnetometry is more than one order of magnitude larger, though a much smaller prefactor imposes the faster equilibration in Dy2GdN@C80. This sheds light on the importance of angular momentum balance and symmetry in magnetic relaxation.

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organization
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type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
103
issue
1
article number
014404
publisher
American Physical Society
external identifiers
  • scopus:85099209694
ISSN
2469-9950
DOI
10.1103/PhysRevB.103.014404
language
English
LU publication?
yes
id
90a4f01b-4b2e-4369-b358-226d7e21109f
date added to LUP
2021-01-25 09:37:30
date last changed
2021-01-25 09:37:30
@article{90a4f01b-4b2e-4369-b358-226d7e21109f,
  abstract     = {<p>Endohedral fullerenes are perfect nanolaboratories for the study of magnetism. The substitution of a diamagnetic scandium atom in Dy2ScN@C80 with gadolinium decreases the stability of a given magnetization and demonstrates Gd to act as a single atom catalyst that accelerates the reaching of thermal equilibrium. X-ray magnetic circular dichroism at the M4,5 edges of Gd and Dy shows that Gd affects the ground state. The Gd magnetic moment follows the sum of the external and the dipolar magnetic field of the two Dy ions and compared to Dy2ScN@C80 a lower exchange barrier is found between the ferromagnetic and the antiferromagnetic Dy configuration. The Arrhenius equilibration barrier as obtained from superconducting quantum interference device magnetometry is more than one order of magnitude larger, though a much smaller prefactor imposes the faster equilibration in Dy2GdN@C80. This sheds light on the importance of angular momentum balance and symmetry in magnetic relaxation.</p>},
  author       = {Kostanyan, Aram and Schlesier, Christin and Westerström, Rasmus and Dreiser, Jan and Fritz, Fabian and Büchner, Bernd and Popov, Alexey A. and Piamonteze, Cinthia and Greber, Thomas},
  issn         = {2469-9950},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Gadolinium as an accelerator for reaching thermal equilibrium and its influence on the ground state of Dy2GdN@ C80 single-molecule magnets},
  url          = {http://dx.doi.org/10.1103/PhysRevB.103.014404},
  doi          = {10.1103/PhysRevB.103.014404},
  volume       = {103},
  year         = {2021},
}