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High Field Superconductivity and Magnetic Moment Enhancement in Proximity Exchange Coupled GdN/NbN Nano-bridges

ORAL

Abstract

Proximity effects in ferromagnetic insulator/superconductor (FI/SC) interface have been highly intriguing in terms of fundamental exploration as well as technological relevance [1,2]. We perform detailed investigations on GdN (FI) and NbN (SC) interface via magneto-transport properties of GdN/NbN-based nano-bridges and thin film heterostructures. We observe a clear enhancement of magnetic moment and a drastic increase of coercive field, below the superconducting transition temperature of NbN, which may be attributed to exchange coupled effect between GdN and NbN at the interface. Most interestingly, our nano-bridges exhibit a large magnetic field dependent superconductivity enhancement for fields > 5T similar to the Jaccarino effect [3]. The observed effect is temperature dependent implying a free energy dependence at the interface. Finally, we also discuss the exchange coupled interface effects and their implications in GdN/NbN system.

Ref.:
[1] J. S. Moodera, T. S. Santos and T. Nagahama, J. Phys.: Condens. Matter 19 165202 (2007);
[2] Y. Zhu et al., Nat. Mat. 16, 195 (2017);
[3] V. Jaccarino and M. Peter, Phys. Rev. Lett. 9, 290 (1962).

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Presenters

  • Mirko Rocci

    Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Massachusetts Institute of Technology MIT

Authors

  • Mirko Rocci

    Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Massachusetts Institute of Technology MIT

  • Dhavala Suri

    Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, MIT, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Massachusetts Institute of Technology MIT

  • Norbert Marcel Nemes

    Unidad Asociada ICMM-CSIC “Laboratorio de Heteroestructuras con Aplicación en Espintrónica”,, Complutense University of Madrid, Fisica de los Materiales, Universidad Complutense de Madrid and ICMM-CSIC

  • Jose Luiz Martinez

    Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Instituto de Ciencia de Materiales de Madrid - CSIC

  • Mar Garcia-Hernandez

    2D Foundry, Instituto de Ciencia de Materiales de Madrid, Instituto de Ciencia de Materiales de Madrid - CSIC

  • Jagadeesh Moodera

    Department of Physics, Massachusetts Institute of Technology, Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, and Department of Physics, MIT, Massachusetts Institute of Technology, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Massachusetts Institute of Technology MIT