Thermal stability of Fe16N2 thin film on GaAs (0 0 1) substrate

Xiaowei Zhang, Valeria Lauter, Haile Ambaye, Jian Ping Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

There is a major need for a high performance magnetic system for high temperature applications. One propitious low cost permanent magnet candidate is Fe16N2, with its giant magnetic moment predicted to be above other materials from conventional first principles calculations. Here we report on a comprehensive study of the thermal stability of Fe16N2 thin films on GaAs (0 0 1) substrate. Using polarized neutron reflectometry (PNR), the saturation magnetization depth profile (Ms) of the films and its modification with temperature is directly measured at various thermal conditions. The structural modifications probed by x-ray diffraction (XRD) unravel that above 250 °C the Fe16N2 thin films decompose into α-Fe and γ′-Fe4N phases. An influence of the strain effect is investigated by grazing incidence x-ray diffraction (GIXRD). We reveal that despite a large Fe16N2 in-plane lattice constant of ∼5.88 å and different strains from substrate or seed layer (up to 2.8% tensile strain), Fe16N2 thin films have the same thermal stability. Our results demonstrate that the high thermal stability of partially order Fe16N2 thin films makes them very promising candidates for spintronics and permanent magnet applications.

Original languageEnglish (US)
Article number066401
JournalMaterials Research Express
Volume4
Issue number6
DOIs
StatePublished - Jun 2017

Bibliographical note

Publisher Copyright:
© 2017 IOP Publishing Ltd.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • FeN
  • High Ms
  • Polarized neutron reflectivity
  • Thermal stability
  • Thin film

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