Impact of Dzyaloshinskii-Moriya interactions on the thermal stability factor of heavy metal/magnetic metal/oxide based nano-pillars

We studied the thermal stability of ultrathin perpendicular magnetized nanodots in the presence of the Dzyaloshinskii-Moriya interaction (DMI) using a minimum energy path method. We find that the smallest energy barrier is associated with the energy path based on domain wall nucleation and propagati...

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Bibliographic Details
Published in:Journal of applied physics 2019-09, Vol.126 (10)
Main Authors: Gastaldo, Daniele, Strelkov, Nikita, Buda-Prejbeanu, Liliana D., Dieny, Bernard, Boulle, Olivier, Allia, Paolo, Tiberto, Paola
Format: Article
Language:English
Subjects:
Applied physics
Condensed Matter
Domain walls
Ferromagnetism
Heavy metals
Nucleation
Physics
Thermal stability
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Summary:We studied the thermal stability of ultrathin perpendicular magnetized nanodots in the presence of the Dzyaloshinskii-Moriya interaction (DMI) using a minimum energy path method. We find that the smallest energy barrier is associated with the energy path based on domain wall nucleation and propagation down to 25 nm lateral size. We show that the DMI has a detrimental impact on the thermal stability factor of square Pt/Co/AlO x dots, which decreases linearly with the DMI amplitude. Our study reveals that the DMI limits the downscaling of MRAM cells based on heavy metal/ferromagnet/oxide trilayers.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5109484