Impact of orthogonal exchange coupling on magnetic anisotropy in antiferromagnetic oxides/ferromagnetic systems

Kuświk, Piotr; Gastelois, Pedro Lana; Głowiński, Hubert; Przybylski, M.; Kirschner, J.

doi:10.1088/0953-8984/28/42/425001

Cited by 2 publications

(1 citation statement)

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“…[ 44 ] Therefore, H EB is often zero for very thin AFM layers, and the EB coupling manifests itself only by higher H C . It should be emphasized that even in that case the PMA is still supported (for the temperatures lower than the ordering temperature of the AFM layers [ 45 ] ) by coupling between the AFM and the FM layers.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%