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Ultrathin Co-O oxide layer-driven perpendicular magnetic anisotropy in a CoO/[Co/Pd](m) multilayer matrix upon annealing

Title
Ultrathin Co-O oxide layer-driven perpendicular magnetic anisotropy in a CoO/[Co/Pd](m) multilayer matrix upon annealing
Author
김태환
Keywords
PERFORMANCE; MEMORY; PD/CO
Issue Date
2016-11
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 6, 37503
Abstract
Ferromagnetic/noble metal multilayer (ML) frames are expected to serve as reliable building blocks in a variety of perpendicular magnetic anisotropy (PMA) based spintronic devices. However, ultrathin ML matrices are highly susceptible to unintended reduction of electron spin polarization in the as-grown or annealed states and often require a large repeat number. Here, we introduce a simple approach to achieve thermally stable PMA in ultrathin [Co/Pd](3) MLs involving the incorporation of an ultrathin CoO capping layer. The thickness and oxygen content of the CoO layer are critical parameters to achieve enhanced PMA in ultrathin [Co/Pd](3)/CoO MLs post-annealed up to 400 degrees C. An extensive analysis of structural features identified that robust PMA characteristics in [Co/Pd](3)/CoO MLs are linked with thermally activated oxygen atom diffusion leading to structural reconfiguration upon annealing. The possible origin of the enhanced PMA in our [Co/Pd](3)/CoO ML samples after high-temperature annealing is discussed, thereby enabling their use in future spintronic-related devices.
URI
https://www.nature.com/articles/srep37503https://repository.hanyang.ac.kr/handle/20.500.11754/100834
ISSN
2045-2322
DOI
10.1038/srep37503
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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