Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias

Dunz M, Meinert M (2020)
Journal of Applied Physics 128(15): 153902.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Dunz, MareikeUniBi; Meinert, M.
Abstract / Bemerkung
Ta/MnN/CoFeB systems show high exchange bias of about 1800Oe at room temperature; however, their thermal stability is limited by nitrogen diffusion that occurs during annealing processes [Quarterman et al., Phys. Rev. Mater. 3, 064413 (2019) and Dunz et al., AIP Adv. 8, 056304 (2018)]. In this study, we investigate the consequences of nitrogen diffusion in Ta/MnN/CoFeB exchange bias stacks in dependence on the Ta buffer layer thickness. Furthermore, we test the effects of introducing a TaNx layer between MnN and Ta as a diffusion barrier. Our findings show that the Ta buffer layer plays a decisive role in determining the exchange bias in the Ta/MnN/CoFeB system. It acts as a crystallographic seed layer for better growth of MnN and as a nitrogen sink during the annealing process. We show that both of these functions are crucial for the outcome of high exchange bias. Additionally, our results reveal that the measures decreasing nitrogen diffusion, even though being beneficial in terms of thermal stability, mostly lead to decreased crystallinity and thus weaker exchange bias.
Erscheinungsjahr
2020
Zeitschriftentitel
Journal of Applied Physics
Band
128
Ausgabe
15
Art.-Nr.
153902
ISSN
0021-8979
eISSN
1089-7550
Page URI
https://pub.uni-bielefeld.de/record/2948943

Zitieren

Dunz M, Meinert M. Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias. Journal of Applied Physics. 2020;128(15): 153902.
Dunz, M., & Meinert, M. (2020). Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias. Journal of Applied Physics, 128(15), 153902. doi:10.1063/5.0021226
Dunz, M., and Meinert, M. (2020). Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias. Journal of Applied Physics 128:153902.
Dunz, M., & Meinert, M., 2020. Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias. Journal of Applied Physics, 128(15): 153902.
M. Dunz and M. Meinert, “Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias”, Journal of Applied Physics, vol. 128, 2020, : 153902.
Dunz, M., Meinert, M.: Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias. Journal of Applied Physics. 128, : 153902 (2020).
Dunz, Mareike, and Meinert, M. “Role of the Ta buffer layer in Ta/MnN/CoFeB stacks for maximizing exchange bias”. Journal of Applied Physics 128.15 (2020): 153902.

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