Anti-ferromagnetic coupling in hybrid magnetic tunnel junctions mediated by monomolecular layers of α-sexithiophene

Abstract : We report here on the magnetic coupling taking place between Fe3O4 and Co layers across an organic monolayer of α-sexithiophene (6T). The controlled growth of 6T ultrathin films on epitaxial Fe3O4 surfaces allows to prepare highly homogeneous insulating layers with thicknesses in the range 0.5–2.0 monolayers (ML). A combined study using vibrating sample magnetometry and polarized neutron reflectivity reveals that hybrid Fe3O4/6T/Co tunnel junctions show different magnetic couplings depending on the 6T thickness. In particular, magnetic coupling between Fe3O4 and Co layers separated by 1 ML of 6T is consistent with anti-ferromagnetic coupling, opening new perspectives for controlling magnetization in organic spintronic devices.
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https://hal-cea.archives-ouvertes.fr/cea-01481044
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Submitted on : Thursday, March 2, 2017 - 10:41:00 AM
Last modification on : Thursday, March 14, 2019 - 9:06:06 PM

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C. Blouzon, F. Ott, L. Tortech, D. Fichou, J.-B. Moussy. Anti-ferromagnetic coupling in hybrid magnetic tunnel junctions mediated by monomolecular layers of α-sexithiophene. Applied Physics Letters, American Institute of Physics, 2013, 103 (4), pp.042417. ⟨10.1063/1.4816954⟩. ⟨cea-01481044⟩

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