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Condensed Matter > Materials Science

arXiv:2303.04543 (cond-mat)
[Submitted on 8 Mar 2023]

Title:Improving Néel domain walls dynamics and skyrmion stability using He ion irradiation

Authors:Cristina Balan, Johannes W. van der Jagt, Aymen Fassatoui, Jose Peña Garcia, Vincent Jeudy, André Thiaville, Jan Vogel, Marlio Bonfim, Laurent Ranno, Dafiné Ravelosona, Stefania Pizzini
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Abstract:Magnetization reversal and domain wall dynamics in Pt/Co/AlOx trilayers have been tuned by He+ ion irradiation. Fluences up to 1.5x10$^{15}$ ions/cm$^2$ strongly decrease the perpendicular magnetic anisotropy (PMA), without affecting neither the spontaneous magnetization nor the strength of the Dzyaloshinskii-Moriya interaction (DMI). This confirms the robustness of the DMI interaction against interfacial chemical intermixing, already predicted by theory. In parallel with the decrease of the PMA in the irradiated samples, a strong decrease of the depinning field is observed. This allows the domain walls to reach large maximum velocities with lower magnetic fields with respect to those needed for the pristine films. Decoupling PMA from DMI can therefore be beneficial for the design of low energy devices based on domain wall dynamics. When the samples are irradiated with larger He+ fluences, the magnetization gets close to the out-of-plane/in-plane reorientation transition where 100nm size magnetic skyrmions are stabilized. We observe that as the He+ fluence increases, the skyrmion size decreases while these magnetic textures become more stable against the application of an external magnetic field.
Comments: 10 pages, 4 figures
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:2303.04543 [cond-mat.mtrl-sci]
  (or arXiv:2303.04543v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2303.04543

Submission history

From: Stefania Pizzini [view email]
[v1] Wed, 8 Mar 2023 12:47:26 UTC (5,044 KB)
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