Low Gilbert damping and high thermal stability of Ru-seeded L1-phase FePd perpendicular magnetic thin films at elevated temperatures
Abstract
Bulk perpendicular magnetic anisotropy materials are proposed to be a promising candidate for next-generation ultrahigh density and ultralow energy-consumption spintronic devices. In this work, we experimentally investigate the structure, thermal stability, and magnetic properties of FePd thin films seeded by an Ru layer. An fcc-phase Ru layer induces the highly-ordered L10-phase FePd thin films with perpendicular magnetic anisotropy (Ku ∼10.1 Merg/cm3). The thermal stability of FePd samples is then studied through the annealing process. It is found that a Ku ∼6.8 Merg/cm3 can be obtained with an annealing temperature of 500 °C. In addition, the Gilbert damping constant α, an important parameter for switching current density, is determined as a function of the testing temperature. We observe that α increases from 0.006 to 0.009 for the as-deposited FePd sample and from 0.006 to 0.012 for the 400 °C-annealed FePd sample as the testing temperature changes from 25 °C to 150 °C. These results suggest that Ru-seeded FePd provides great potential in scaling perpendicular magnetic tunnel junctions below 10 nm for applications in ultralow energy-consumption spintronic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 24, 2020
- Source ID
- 10.1063/5.0016100
Entities
People
- Andre Mkhoyan
- Daniel B Gopman
- De-Lin Zhang
- Dingbin Huang
- Dustin M Lattery
- Jian-Ping Wang
- Jinming Liu
- Ryan J. Wu
- Xiaojia Wang
- Xinjun Wang
Organizations
- Defense Advanced Research Projects Agency
- National Institute of Standards and Technology
- University of Minnesota