Lourembam, J., Khoo, K. H., Qiu, J., Xie, H., Wong, S. K., Yap, Q. J., Lim, S. T. (2021). Tuning Damping and Magnetic Anisotropy in Ultrathin Boron‐Engineered MgO/Co–Fe–B/MgO Heterostructures. Advanced Electronic Materials, 7(9). Portico. https://doi.org/10.1002/aelm.202100351
Abstract:
AbstractNanometer‐thick Co–Fe–B/MgO based structures have been widely accepted as the preferred system for immediate and long‐term goals in magnetic random access memory (MRAM) devices because of excellent spin‐torque efficiency and promise for high‐density MRAM. To realize next‐generation ultra‐low‐power MRAM, further lowering of power consumption in these structures is a crucial ongoing effort. Gilbert damping is one critical material parameter toward lowering energy consumption but is traditionally large (≈10−2) in these Co–Fe–B/MgO systems. Here, Gilbert damping of (1.3 ± 0.3) × 10−3 from a perpendicular double Co–Fe–B/MgO interface system engineered at different boron compositions is reported. Remarkably, this value is achieved with ≈1 nm of Co–Fe–B thickness while maintaining magnetic anisotropy of 0.4 Merg cc−1. An unusual damping trend that scales with layer thickness in high‐boron content films established from both experiments and first‐principles calculations is reported.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - A*STAR Programmatic Fund- SpOT LITE
Grant Reference no. : A18A6b0057
This research is supported by core funding from: A*STAR
Grant Reference no. : CF-16
This research / project is supported by the A*STAR - RIE2020 AME Core Fund
Grant Reference no. : A1818g0042
Description:
This is the peer reviewed version of the following article: Lourembam, J., Khoo, K. H., Qiu, J., Xie, H., Wong, S. K., Yap, Q. J., & Lim, S. T. (2021). Tuning Damping and Magnetic Anisotropy in Ultrathin Boron‐Engineered MgO/Co–Fe–B/MgO Heterostructures. Advanced Electronic Materials, 7(9). Portico. https://doi.org/10.1002/aelm.202100351, which has been published in final form at https://doi.org/10.1002/aelm.202100351. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.