Ultrathin Co-O oxide layer-driven perpendicular magnetic anisotropy in a CoO/[Co/Pd](m) multilayer matrix upon annealingopen access
- Authors
- Chung, Woo Seong; Yang, Seung Mo; Kim, Tae Whan; Hong, Jin Pyo
- Issue Date
- Nov-2016
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.6, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 6
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/21438
- DOI
- 10.1038/srep37503
- ISSN
- 2045-2322
- 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.
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