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On the explanation of the paramagnetic Meissner effect in superconductor/ferromagnet heterostructures

Nagy, B; Khaydukov, Yu; Efremov, Dimitar; Vasenko, A. S.; Mustafa, L.; Kim, H. -J.; Keller, Evan T.; Zhernenkov, K.; Devishvili, A. and Steitz, R., et al. (2016) In Europhysics Letters 116(1).
Abstract

An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40 nm)/F (, Co(3 nm), Ni(3 nm)) was observed using SQUID magnetometry upon cooling below the superconducting transition temperature T C in magnetic fields of 10 Oe to 50 Oe applied parallel to the sample surface. A similar increase, often called the paramagnetic Meissner effect (PME), was observed before in various superconductors and superconductor/ferromagnet systems. To explain the PME effect in the presented S/F bilayers a model based on a row of vortices located at the S/F interface is proposed. According to the model the magnetic moment induced below T C consists of the paramagnetic contribution of the vortex cores and the... (More)

An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40 nm)/F (, Co(3 nm), Ni(3 nm)) was observed using SQUID magnetometry upon cooling below the superconducting transition temperature T C in magnetic fields of 10 Oe to 50 Oe applied parallel to the sample surface. A similar increase, often called the paramagnetic Meissner effect (PME), was observed before in various superconductors and superconductor/ferromagnet systems. To explain the PME effect in the presented S/F bilayers a model based on a row of vortices located at the S/F interface is proposed. According to the model the magnetic moment induced below T C consists of the paramagnetic contribution of the vortex cores and the diamagnetic contribution of the vortex-free region of the S layer. Since the thickness of the S layer is found to be 3-4 times less than the magnetic-field penetration depth, this latter diamagnetic contribution is negligible. The model correctly accounts for the sign, the approximate magnitude and the field dependence of the paramagnetic and the Meissner contributions of the induced magnetic moment upon passing the superconducting transition of a ferromagnet/superconductor bilayer.

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publication status
published
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Europhysics Letters
volume
116
issue
1
publisher
EDP Sciences
external identifiers
  • scopus:84999788902
ISSN
0295-5075
DOI
10.1209/0295-5075/116/17005
language
English
LU publication?
no
id
4881187d-5ef7-44c7-93db-dd8cd7cd2a9f
date added to LUP
2017-04-10 14:15:47
date last changed
2017-04-19 14:32:55
@article{4881187d-5ef7-44c7-93db-dd8cd7cd2a9f,
  abstract     = {<p>An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40 nm)/F (, Co(3 nm), Ni(3 nm)) was observed using SQUID magnetometry upon cooling below the superconducting transition temperature T <sub>C</sub> in magnetic fields of 10 Oe to 50 Oe applied parallel to the sample surface. A similar increase, often called the paramagnetic Meissner effect (PME), was observed before in various superconductors and superconductor/ferromagnet systems. To explain the PME effect in the presented S/F bilayers a model based on a row of vortices located at the S/F interface is proposed. According to the model the magnetic moment induced below T <sub>C</sub> consists of the paramagnetic contribution of the vortex cores and the diamagnetic contribution of the vortex-free region of the S layer. Since the thickness of the S layer is found to be 3-4 times less than the magnetic-field penetration depth, this latter diamagnetic contribution is negligible. The model correctly accounts for the sign, the approximate magnitude and the field dependence of the paramagnetic and the Meissner contributions of the induced magnetic moment upon passing the superconducting transition of a ferromagnet/superconductor bilayer.</p>},
  articleno    = {17005},
  author       = {Nagy, B and Khaydukov, Yu and Efremov, Dimitar and Vasenko, A. S. and Mustafa, L. and Kim, H. -J. and Keller, Evan T. and Zhernenkov, K. and Devishvili, A. and Steitz, R. and Keimer, B. and Bottyán, L.},
  issn         = {0295-5075},
  language     = {eng},
  month        = {10},
  number       = {1},
  publisher    = {EDP Sciences},
  series       = {Europhysics Letters},
  title        = {On the explanation of the paramagnetic Meissner effect in superconductor/ferromagnet heterostructures},
  url          = {http://dx.doi.org/10.1209/0295-5075/116/17005},
  volume       = {116},
  year         = {2016},
}