Heavy‐Metal‐Free, Low‐Damping, and Non‐Interface Perpendicular Fe16N2 Thin Film and Magnetoresistance Device. Issue 7 (23rd April 2019)

• Record Type: Journal Article
• Authors: Li, Xuan; Yang, Meiyin; Jamali, Mahdi; Shi, Fengyuan; Kang, Shishou; Jiang, Yanfeng; Zhang, Xiaowei; Li, Hongshi; Okatov, Sergey; Faleev, Sergey; Kalitsov, Alan; Yu, Guanghua; Voyles, Paul M.; Mryasov, Oleg N.; Wang, Jian‐Ping
• Is Part Of: Physica status solidi. Volume 13:Issue 7(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-04-23
• Subjects: damping constant -- Fe16N2 -- giant magnetoresistance -- perpendicular magnetic anisotropy -- spintronic devices; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201900089
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Realization of sub‐10 nm spin‐based logic and memory devices relies on the development of magnetic materials with perpendicular magnetic anisotropy that can provide low switching current and large thermal stability simultaneously. In this work, the authors report on one promising candidate, Fe16 N2, a heavy‐metal‐free, non‐interface perpendicular magnetic material and demonstrate a perpendicularly magnetized current‐perpendicular‐to‐plane (CPP) giant magnetoresistance (GMR) device based on Fe16 N2 . The crystalline‐based perpendicular anisotropy of Fe16 N2 in the CPP GMR device is measured to be about 1.9 × 10 6 J m −3 (1.9 × 10 7 erg cm −3 ), which is sufficient to maintain the thermal stability of sub‐10 nm devices. A first principle calculation is performed to support this large magnitude of the perpendicular anisotropy. Moreover, the Gilbert damping constant of the Fe16 N2 thin film ( α ≈0.01) measured by ferromagnetic resonance (FMR) is lower than for most existing materials with crystalline perpendicular magnetic anisotropy. The non‐interface perpendicular anisotropy and low damping properties of Fe16 N2 may offer a pathway for future spintronics logic and memory devices. Abstract : Realization of sub‐10 nm spin‐based logic and memory devices relies on materials with perpendicular magnetic anisotropy (PMA) that can provide large thermal stability and low switching current. This article demonstrates that Fe16 N2, a heavy‐metal‐free, low‐damping, and non‐interface perpendicular material, may satisfy the above requirements for sub‐10 nm spintronic devices, due to its large PMA and small damping constant.