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Abstract
Perpendicular magnetic materials with low damping constant and high thermal stability have great potential for realizing high-density, non-volatile, and low-power consumption spintronic devices, which can sustain operation reliability for high processing temperatures. In this work, we study the Gilbert damping constant (α) of perpendicularly magnetized W/CoFeB/MgO films with a high perpendicular magnetic anisotropy (PMA) and superb thermal stability. The α of these PMA films annealed at different temperatures (Tann) is determined via an all-optical Time-Resolved Magneto-Optical Kerr Effect method. We find that α of these W/CoFeB/MgO PMA films decreases with increasing Tann, reaches a minimum of α = 0.015 at Tann= 350 °C, and then increases to 0.020 after post-annealing at 400 °C. The minimum α observed at 350 °C is rationalized by two competing effects as Tannbecomes higher: the enhanced crystallization of CoFeB and dead-layer growth occurring at the two interfaces of the CoFeB layer. We further demonstrate that α of the 400 °C-annealed W/CoFeB/MgO film is comparable to that of a reference Ta/CoFeB/MgO PMA film annealed at 300 °C, justifying the enhanced thermal stability of the W-seeded CoFeB films.
Original language | English (US) |
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Article number | 13395 |
Journal | Scientific reports |
Volume | 8 |
Issue number | 1 |
DOIs | |
State | Published - Dec 1 2018 |
Bibliographical note
Publisher Copyright:© 2018, The Author(s).
How much support was provided by MRSEC?
- Shared
Reporting period for MRSEC
- Period 5
PubMed: MeSH publication types
- Journal Article
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MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
9/1/98 → …
Project: Research project
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