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Unexpected Development of Perpendicular Magnetic Anisotropy in Ni/NiO Multilayers After Mild Thermal Annealing
Univ Patras, Dept Mat Sci, Patras 26504, Greece.ORCID iD: 0000-0003-1123-7372
Univ Grenoble Alpes, CNRS, Grenoble INP, LMGP, F-38000 Grenoble, France.
Univ Grenoble Alpes, CNRS, Grenoble INP, LMGP, F-38000 Grenoble, France.
Univ Patras, Dept Mat Sci, Patras 26504, Greece.
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2019 (English)In: IEEE Magnetics Letters, ISSN 1949-307X, E-ISSN 1949-3088, Vol. 10, article id 6104105Article in journal (Refereed) Published
Abstract [en]

We report on the significant enhancement of perpendicular magnetic anisotropy of Ni/NiO multilayers after mild annealing up to 90 min at 250 degrees C. Transmission electron microscopy shows that after annealing, a partial crystallization of the initially amorphous NiO layers occurs. This turns out to be the source of the anisotropy enhancement. Magnetic measurements reveal that even multilayers with Ni layers as thick as 7 nm, which in the as-deposited state showed in-plane anisotropy with square hysteresis loops, show reduced in-plane remanence after thermal treatment. Hysteresis loops recorded with the field in the normal-to-film-plane direction provide evidence for perpendicular magnetic anisotropy with up and down magnetic domains at remanence. A plot of effective uniaxial magnetic anisotropy constant times individual Ni layer thickness as a function of individual Ni layer thickness shows a large change in the slope of the data attributed to a drastic change of volume anisotropy. Surface anisotropy showed a small decrease because of some layer roughening introduced by annealing.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 10, article id 6104105
Keywords [en]
Nanomagnetics, magnetic films, perpendicular magnetic recording, spin electronics
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-393015DOI: 10.1109/LMAG.2019.2925315ISI: 000480349000001OAI: oai:DiVA.org:uu-393015DiVA, id: diva2:1352719
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved

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Kapaklis, Vassilios

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