Determination of the Dzyaloshinskii-Moriya interaction in exchange biased Au/Co/NiO systems

Kuświk, Piotr; Matczak, M.; Kowacz, Mateusz; Lisiecki, Filip; Stobiecki, F.

doi:10.1016/j.jmmm.2018.10.002

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…Spin textures in exchange biased Au/Co/NiO systems show clockwise (CW) chirality; as inferred using asymmetric domain propagation 11 and magnetization reversal of micrometric-sized triangles 12 . In those systems, it was expected that the Au layer would not be the main source of interfacial DMI and the chirality would be supported only at the Co–CoO–NiO interface.…”

Section: Introductionmentioning

confidence: 99%

Strong interfacial Dzyaloshinskii–Moriya induced in Co due to contact with NiO

Kowacz

Mazalski

Sveklo

et al. 2022

Sci Rep

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The magnetic properties of NiO/Co/Pt as a function of Co layer thickness were investigated by polar magneto-optical Kerr effect (PMOKE) (magnetometry and microscopy) and Brillouin Light Scattering (BLS) spectroscopy. PMOKE measurements revealed strong surface anisotropy (1.8 mJ/m2) favoring perpendicular magnetic anisotropy and asymmetric domain wall propagation explained by anticlockwise chirality. BLS measurements show that this chirality is induced by strong interfacial Dzyaloshinskii–Moriya interaction (+ 2.0 pJ/m). This is one of the highest values reported so far for Co layers surrounded by different layers. The observed chirality is opposite to what has been found in Co/oxide interfaces. These results and data published earlier, indicate that the strength of interfacial Dzyaloshinskii–Moriya interaction increases with the amount of stoichiometric NiO. Therefore, this work shows that NiO is the source of the interfacial Dzyaloshinskii–Moriya interaction.

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Section: Introductionmentioning

confidence: 99%

Strong interfacial Dzyaloshinskii–Moriya induced in Co due to contact with NiO

Kowacz

Mazalski

Sveklo

et al. 2022

Sci Rep

Self Cite

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“…Current extensive research on such system reveals that, at the FM/MO interfaces, the MO layers induce strong PMA [ 9 , 14 , 15 ] and interfacial Dzyaloshinskii-Moriya interaction [ 16 , 17 ]. These responses can also be triggered using antiferromagnetic oxides (AFOs) [ 18 , 19 , 20 ], enabling new ways to tailor magnetization reversal through the EB coupling. This capability can be used to stabilize skyrmions at room temperature (RT) without external magnetic fields [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Strong Interfacial Perpendicular Magnetic Anisotropy in Exchange-Biased NiO/Co/Au and NiO/Co/NiO Layered Systems

et al. 2021

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The ability to induce and control the perpendicular magnetic anisotropy (PMA) of ferromagnetic layers has been widely investigated, especially those that offer additional functionalities (e.g., skyrmion stabilization, voltage-based magnetization switching, rapid propagation of domain walls). Out-of-plane magnetized ferromagnetic layers in direct contact with an oxide belong to this class. Nowadays, investigation of this type of system includes antiferromagnetic oxides (AFOs) because of their potential for new approaches to applied spintronics that exploit the exchange bias (EB) coupling between the ferromagnetic and the AFO layer. Here, we investigate PMA and EB effect in NiO/Co/Au and NiO/Co/NiO layered systems. We show that the coercive and EB fields increase significantly when the Co layer is coupled with two NiO layers, instead of one. Surrounding the Co layer only with NiO layers induces a strong PMA resulting in an out-of-plane magnetized system can be obtained without a heavy metal/ferromagnetic interface. The PMA arises from a significant surface contribution (0.74 mJ/m2) that can be enhanced up to 0.99 mJ/m2 by annealing at moderate temperatures (~450 K). Using field cooling processes for both systems, we demonstrate a wide-ranging control of the exchange bias field without perturbing other magnetic properties of importance.

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“…Recently, it was shown that oxidation of the Ni layer is responsible for spin textures with left‐handed chirality through the Dzyaloshinskii−Moriya interaction. [ 27 ] This interaction, as well as PMA, is also supported by the NiO layer [ 28,29 ] opening up opportunities to use the PO process as a new approach to tune the magnetic properties of the Co/Ni bilayer.…”

Section: Introductionmentioning

confidence: 99%

Origin of Perpendicular Magnetic Anisotropy Enhancement in Co/Ni Bilayer Due to Plasma Oxidation

Anastaziak

Głowiński

Urbaniak

et al. 2021

Physica Rapid Research Ltrs

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In spintronics and magnonics, materials that offer tunable perpendicular magnetic anisotropy (PMA) along with low Gilbert damping and high spin polarization are particularly important. Therefore, a lot of studies are performed on Co/Ni films, that aim at satisfying all these requirements. Moreover, the Dzyaloshinskii−Moriya interaction is induced in them by surrounding the magnetic layers with heavy metal or oxide layers. For this reason, the study of the oxidation of Co/Ni is of particular interest. Therefore, the magnetic properties of Co/Ni bilayers after plasma oxidation (PO) are investigated. It is shown that the magnetic anisotropy of these bilayers can be tuned, not only by the thicknesses of Co and Ni layers, but also by oxidation time varied in the range between 15 and 220 s. After PO, the effective thickness of ferromagnetic Ni is reduced, but it does not oxidize more than ≈2 nm, even for longer oxidation. However, the contribution to PMA increases for the entire range of oxidation times. This indicates that the thickness reduction of the Ni layer is not the only source of PMA enhancement. This additional contribution is attributed to the exchange bias coupling between the ferromagnetic (Co/Ni) and the antiferromagnetic NiO layers.

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Determination of the Dzyaloshinskii-Moriya interaction in exchange biased Au/Co/NiO systems

Cited by 11 publications

References 33 publications

Strong interfacial Dzyaloshinskii–Moriya induced in Co due to contact with NiO

Strong interfacial Dzyaloshinskii–Moriya induced in Co due to contact with NiO

Strong Interfacial Perpendicular Magnetic Anisotropy in Exchange-Biased NiO/Co/Au and NiO/Co/NiO Layered Systems

Origin of Perpendicular Magnetic Anisotropy Enhancement in Co/Ni Bilayer Due to Plasma Oxidation

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