Highly stable perpendicular magnetic anisotropies of CoFeB/MgO frames employing W buffer and capping layers

Title
Highly stable perpendicular magnetic anisotropies of CoFeB/MgO frames employing W buffer and capping layers
Author
홍진표
Keywords
Perpendicular magnetic anisotropy (PMA); Interface anisotropy; CoFeB/MgO; Annealing stability; B diffusion
Issue Date
2015-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, NO 87, Page. 259-265
Abstract
Typical CoFeB/MgO frames ensuring interface perpendicular magnetic anisotropy (PMA) features are one of the most reliable building blocks to meet the demand of PMA-based memory devices. However, employing the CoFeB/MgO frame with a Ta buffer layer has been restricted by the rapid PMA degradation that occurs during annealing at temperatures greater than 300 °C and the need of an ultrathin CoFeB layer of approximately 1.3 nm. Thus, the ability to enhance thermally strong PMA characteristics is still a key step toward extending their use. Here, we examine the effect of W layers on PMA features through both W buffer/CoFeB/MgO and MgO/CeFeB/W capping frames at various annealing temperatures. Highly stable PMA was achieved up to 450 °C at a specific W thickness, along with the presence of the dominant PMA properties at a relatively thick CoFeB greater than 1.3 nm and the achievement of a high Keff of approximately 5 Merg/cc.
URI
http://hdl.handle.net/20.500.11754/21287http://www.sciencedirect.com/science/article/pii/S1359645415000269
ISSN
1359-6454; 1873-2453
DOI
10.1016/j.actamat.2015.01.022
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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