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Title: Unconventional magnetisation texture in graphene/cobalt hybrids

Magnetic domain structure and spin-dependent reflectivity measurements on cobalt thin films intercalated at the graphene/Ir(111) interface are investigated using spin-polarised low-energy electron microscopy. We find that graphene-covered cobalt films have surprising magnetic properties. Vectorial imaging of magnetic domains reveals an unusually gradual thickness-dependent spin reorientation transition, in which magnetisation rotates from out-of-the-film plane to the in-plane direction by less than 10° per cobalt monolayer. During this transition, cobalt films have a meandering spin texture, characterised by a complex, three-dimensional, wavy magnetisation pattern. In addition, spectroscopy measurements suggest that the electronic band structure of the unoccupied states is essentially spin-independent already a few electron-Volts above the vacuum level. These properties strikingly differ from those of pristine cobalt films and could open new prospects in surface magnetism.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Scientific Research National Center (CNRS), Grenoble (France); Univ. of Grenoble (France)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and devices; ferromagnetism; magnetic properties and materials; surfaces, interfaces and thin films
OSTI Identifier:
1379301

Vu, A. D., Coraux, J., Chen, G., N’Diaye, A. T., Schmid, A. K., and Rougemaille, N.. Unconventional magnetisation texture in graphene/cobalt hybrids. United States: N. p., Web. doi:10.1038/srep24783.
Vu, A. D., Coraux, J., Chen, G., N’Diaye, A. T., Schmid, A. K., & Rougemaille, N.. Unconventional magnetisation texture in graphene/cobalt hybrids. United States. doi:10.1038/srep24783.
Vu, A. D., Coraux, J., Chen, G., N’Diaye, A. T., Schmid, A. K., and Rougemaille, N.. 2016. "Unconventional magnetisation texture in graphene/cobalt hybrids". United States. doi:10.1038/srep24783. https://www.osti.gov/servlets/purl/1379301.
@article{osti_1379301,
title = {Unconventional magnetisation texture in graphene/cobalt hybrids},
author = {Vu, A. D. and Coraux, J. and Chen, G. and N’Diaye, A. T. and Schmid, A. K. and Rougemaille, N.},
abstractNote = {Magnetic domain structure and spin-dependent reflectivity measurements on cobalt thin films intercalated at the graphene/Ir(111) interface are investigated using spin-polarised low-energy electron microscopy. We find that graphene-covered cobalt films have surprising magnetic properties. Vectorial imaging of magnetic domains reveals an unusually gradual thickness-dependent spin reorientation transition, in which magnetisation rotates from out-of-the-film plane to the in-plane direction by less than 10° per cobalt monolayer. During this transition, cobalt films have a meandering spin texture, characterised by a complex, three-dimensional, wavy magnetisation pattern. In addition, spectroscopy measurements suggest that the electronic band structure of the unoccupied states is essentially spin-independent already a few electron-Volts above the vacuum level. These properties strikingly differ from those of pristine cobalt films and could open new prospects in surface magnetism.},
doi = {10.1038/srep24783},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {4}
}