Large-Voltage Tuning of Dzyaloshinskii–Moriya Interactions: A Route toward Dynamic Control of Skyrmion Chirality - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nano Letters Année : 2018

Large-Voltage Tuning of Dzyaloshinskii–Moriya Interactions: A Route toward Dynamic Control of Skyrmion Chirality

Anne Bernand-Mantel
Laurent Ranno
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Stefania Pizzini
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Olivier Boulle
Gilles Gaudin
Hélène Béa

Résumé

Electric control of magnetism is a prerequisite for efficient and low power spintronic devices. More specifically, in heavy metal/ ferromagnet/ insulator heterostructures, voltage gating has been shown to locally and dynamically tune magnetic properties like interface anisotropy and saturation magnetization. However, its effect on interfacial Dzyaloshinskii-Moriya Interaction (DMI), which is crucial for the stability of magnetic skyrmions, has been challenging to achieve and has not been reported yet for ultrathin films. Here, we demonstrate 130% variation of DMI with electric field in Ta/FeCoB/TaOx trilayers through Brillouin Light Spectroscopy (BLS). Using polar- Magneto-Optical-Kerr-Effect microscopy, we further show a monotonic variation of DMI and skyrmionic bubble size with electric field, with an unprecedented efficiency. We anticipate through our observations that a sign reversal of DMI with electric field is possible, leading to a chirality switch. This dynamic manipulation of DMI establishes an additional degree of control to engineer programmable skyrmion based memory or logic devices.

Dates et versions

hal-01873478 , version 1 (13-09-2018)

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Citer

Titiksha Srivastava, Marine Schott, Roméo Juge, Viola Křižáková, Mohamed Belmeguenai, et al.. Large-Voltage Tuning of Dzyaloshinskii–Moriya Interactions: A Route toward Dynamic Control of Skyrmion Chirality. Nano Letters, 2018, 18 (8), pp.4871 - 4877. ⟨10.1021/acs.nanolett.8b01502⟩. ⟨hal-01873478⟩
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