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

Published

August 25, 2020

Author(s)

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

Abstract

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.

Citation

Applied Physics Letters

Pub Type

Journals

Citation

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 19, 2024)