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Low damping and high thermal stability of Ru-seeded L10-phase FePd perpendicular magnetic thin films



Daniel B. Gopman, Xinjun Wang, Delin Zhang, Dingbin Huang, Ryan Wu, Dustin Lattery, K. Andre Mkhoyan, Xiojia Wang, Jian-Ping Wang


Bulk perpendicular magnetic anisotropy materials are proposed to be a promising candidate for exploring next-generation ultrahigh density and ultralow energy spintronic devices. In this work, we experimentally investigate the structural, thermal stability, and magnetic properties of FePd thin films seeded by a Ru layer. A fcc-phase Ru seed layer induces the high-ordered L10-phase FePd thin films with perpendicular magnetic anisotropy Ku~ 1.1 MJ/m3. Then the thermal stability of FePd samples were studied through the annealing process, it is found that the Ku~(0.65 MJ/m3) is obtained when the annealing temperature is up to 500 ℃. In addition, the damping constant α was extracted as a function of the testing temperature, which is a very important parameter related to switching current density. We observed that the α values show the slightly increase from 0.006 to 0.009 for as-deposited FePd sample and from 0.007 to 0.011 for 400 ℃-annealed FePd samples, respectively, with the increasing of testing temperature from 25 ℃ to 150 ℃. These results suggest that Ru-seeded FePd provide significant potential in scaling magnetic memory elements to below 10 nm for applications on ultralow energy spintronic devices.
Applied Physics Letters


Gopman, D. , Wang, X. , Zhang, D. , Huang, D. , Wu, R. , Lattery, D. , , K. , Wang, X. and Wang, J. (2020), Low damping and high thermal stability of Ru-seeded L10-phase FePd perpendicular magnetic thin films, Applied Physics Letters (Accessed April 17, 2024)
Created August 24, 2020, Updated August 25, 2020