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Estrader M, López-Ortega A, Estradé S, et al. Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles. Nat Commun. 2013;4:2960doi: 10.1038/ncomms3960.
Estrader, M., López-Ortega, A., Estradé, S., Golosovsky, I. V., Salazar-Alvarez, G., Vasilakaki, M., Trohidou, K. N., Varela, M., Stanley, D. C., Sinko, M., Pechan, M. J., Keavney, D. J., Peiró, F., Suriñach, S., Baró, M. D., & Nogués, J. (2013). Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles. Nature communications, 42960. https://doi.org/10.1038/ncomms3960
Estrader, M, et al. "Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles." Nature communications vol. 4 (2013): 2960. doi: https://doi.org/10.1038/ncomms3960
Estrader M, López-Ortega A, Estradé S, Golosovsky IV, Salazar-Alvarez G, Vasilakaki M, Trohidou KN, Varela M, Stanley DC, Sinko M, Pechan MJ, Keavney DJ, Peiró F, Suriñach S, Baró MD, Nogués J. Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles. Nat Commun. 2013;4:2960. doi: 10.1038/ncomms3960. PMID: 24343382.
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Nat Commun. 2013;4:2960. doi: 10.1038/ncomms3960.

Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles.

Nature communications

M Estrader, A López-Ortega, S Estradé, I V Golosovsky, G Salazar-Alvarez, M Vasilakaki, K N Trohidou, M Varela, D C Stanley, M Sinko, M J Pechan, D J Keavney, F Peiró, S Suriñach, M D Baró, J Nogués

Affiliations

  1. 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, E-08193 Bellaterra, Barcelona, Spain [2] Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 645, E-08028 Barcelona, Spain.
  2. 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, E-08193 Bellaterra, Barcelona, Spain [2] INSTM and Dipartimento di Chimica 'U. Schiff', Università degli Studi di Firenze, Via della Lastruccia 3, Sesto Fiorentino, I-50019 Firenze, Italy.
  3. 1] LENS-MIND-IN2UB, Departament d'Electrònica, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain [2] TEM-MAT, SCT, Universitat de Barcelona, E-08028 Barcelona, Spain.
  4. 1] St Petersburg Nuclear Physics Institute, 188300 Gatchina, St Petersburg, Russia [2] Ioffe Physico-Technical Institute of the RAS, 194021 St Petersburg, Russia.
  5. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden.
  6. IAMPPMN, Department of Materials Science, NCSR 'Demokritos', 153 41 Aghia Paraskevi, Attiki, Greece.
  7. 1] Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA [2] Departamento de Física Aplicada III & Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  8. Department of Physics, Miami University, Oxford, Ohio 45056, USA.
  9. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  10. LENS-MIND-IN2UB, Departament d'Electrònica, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain.
  11. Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain.
  12. 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, E-08193 Bellaterra, Barcelona, Spain [2] Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain [3] Institució Catalana de Recerca i Estudis Avançats (ICREA), E-08010 Barcelona, Spain.

PMID: 24343382 DOI: 10.1038/ncomms3960

Abstract

The growing miniaturization demand of magnetic devices is fuelling the recent interest in bi-magnetic nanoparticles as ultimate small components. One of the main goals has been to reproduce practical magnetic properties observed so far in layered systems. In this context, although useful effects such as exchange bias or spring magnets have been demonstrated in core/shell nanoparticles, other interesting key properties for devices remain elusive. Here we show a robust antiferromagnetic (AFM) coupling in core/shell nanoparticles which, in turn, leads to the foremost elucidation of positive exchange bias in bi-magnetic hard-soft systems and the remarkable regulation of the resonance field and amplitude. The AFM coupling in iron oxide-manganese oxide based, soft/hard and hard/soft, core/shell nanoparticles is demonstrated by magnetometry, ferromagnetic resonance and X-ray magnetic circular dichroism. Monte Carlo simulations prove the consistency of the AFM coupling. This unique coupling could give rise to more advanced applications of bi-magnetic core/shell nanoparticles.

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