Ion irradiation and implantation modifications of magneto-ionically induced exchange bias in Gd/NiCoO

Christopher J. Jensen, Alberto Quintana, Mamour Sall, Liza Herrera Diez, Junwei Zhang, Xixiang Zhang, Dafiné Ravelosona, Kai Liu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Magneto-ionic control of magnetic properties through ionic migration has shown promise in enabling new functionalities in energy-efficient spintronic devices. In this work, we demonstrate the effect of helium ion irradiation and oxygen implantation on magneto-ionically induced exchange bias effect in Gd/Ni0.33Co0.67O heterostructures. Irradiation using He+ leads to an expansion of the Ni0.33Co0.67O lattice due to strain relaxation. At low He+ fluence (≤2×1014 ions cm-2), the redox-induced interfacial magnetic moment initially increases, owing to enhanced oxygen migration. At higher fluence, the exchange bias is suppressed due to reduction of pinned uncompensated interfacial Ni0.33Co0.67O spins. For oxygen implanted samples, an initial lattice expansion below a dose of 5×1015 cm-2 is subsequently dominated at higher dose by a lattice contraction and phase segregation into NiO and CoO-rich phases, which in turn alters the exchange bias. These results highlight the possibility of ion irradiation and implantation as an effective means to tailor magneto-ionic effects.
Original languageEnglish (US)
Pages (from-to)168479
JournalJournal of Magnetism and Magnetic Materials
DOIs
StatePublished - Aug 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-08-31
Acknowledged KAUST grant number(s): OSR-2019-CRG8-4081
Acknowledgements: This work has been supported in part by the NSF (ECCS-1933527), by SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST), by KAUST (OSR-2019-CRG8-4081), and by a PREMAT CNRS project and a POC In Lab from University of Paris Saclay. The acquisition of a Magnetic Property Measurements System (MPMS3) at GU, which was used in this investigation, was supported by the NSF (DMR-1828420).

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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