Magnetic anisotropy and damping for monolayer-controlled Co | Ni epitaxial multilayer

Takeshi Seki, Junpei Shimada, Satoshi Iihama, Masahito Tsujikawa, Tomoyuki Koganezawa, Akihiro Shioda, Takayuki Tashiro, Weinan Zhou, Shigemi Mizukami, Masafumi Shirai, Koki Takanashi

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8 Citations (Scopus)

Abstract

Structures and magnetic properties were systematically investigated for the monolayer (ML)-controlled Co | Ni multilayers with various Ni layer thicknesses, where the Co and Ni layers were epitaxially grown on a Al2O3 (1120) single crystal substrate or deposited on a thermally oxidized Si substrate. The epitaxial Co | Ni multilayers exhibited high uniaxial magnetic anisotropy energies (Ku) and low effective magnetic damping constants (αeff), resulting in the perpendicular magnetization with low damping even for the 1 ML-Ni | 1 ML-Co multilayer. By comparing the experimental results with the first principles calculation, we found that the Ni atoms largely contributed to the perpendicular anisotropy for the Co | Ni multilayers. We also discussed the possible mechanism dominating the magnitude of αeff for the Co | Ni multilayers based on the experiments and the calculations. The present results suggest that the epitaxial Co | Ni multilayer is a promising material to achieve high Ku and low magnetic damping simultaneously.

Original languageEnglish
Article number074710
Journaljournal of the physical society of japan
Volume86
Issue number7
DOIs
Publication statusPublished - 2017 Jul 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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