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

•Ion irradiation/implantation effect on magneto-ionically induced exchange bias.•Helium irradiation leads to suppression of exchange bias in Gd/NiCoO.•Oxygen implantation triggers phase segregation into CoO and NiO-rich phases.•An effective solid-state means to tailor magneto-ionic effects. Magneto-...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-12, Vol.540, p.168479, Article 168479
Main Authors: Jensen, Christopher J., Quintana, Alberto, Sall, Mamour, Diez, Liza Herrera, Zhang, Junwei, Zhang, Xixiang, Ravelosona, Dafiné, Liu, Kai
Format: Article
Language:English
Subjects:
Bias
Condensed Matter
Exchange bias
Fluence
Gadolinium
Helium ions
Heterostructures
Ion implantation
Ion irradiation
Ion migration
Magnetic moments
Magnetic properties
Magneto-ionics
Materials Science
Oxygen
Phase segregation
Physics
Strain relaxation
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Summary:•Ion irradiation/implantation effect on magneto-ionically induced exchange bias.•Helium irradiation leads to suppression of exchange bias in Gd/NiCoO.•Oxygen implantation triggers phase segregation into CoO and NiO-rich phases.•An effective solid-state means to tailor magneto-ionic effects. 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.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168479