The impact of number of repeats N on the interlayer exchange in [Fe/MgO]N(001) superlattices

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2021
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Warnatz, Tobias
Magnus, Fridrik
Strandqvist, Nanny
Ali, Hasan
Leifer, Klaus
Vorobiev, Alexei
Hjörvarsson, Björgvin
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The strength of the interlayer exchange coupling in [Fe/MgO]N(001) superlattices with 2 ≤ N ≤ 10 depends on the number of bilayer repeats (N). The exchange coupling is antiferromagnetic for all the investigated thicknesses while being nine times larger in a sample with N = 4 as compared to N = 2. The sequence of the magnetic switching in two of the samples (N = 4, N = 8) is determined using polarized neutron reflectometry. The outermost layers are shown to respond at the lowest fields, consistent with having the weakest interlayer exchange coupling. The results are consistent with the existence of quantum well states defined by the thickness of the Fe and the MgO layers as well as the number of repeats (N) in [Fe/MgO]N(001) superlattices.

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ISO 690WARNATZ, Tobias, Fridrik MAGNUS, Nanny STRANDQVIST, Sarah SANZ, Hasan ALI, Klaus LEIFER, Alexei VOROBIEV, Björgvin HJÖRVARSSON, 2021. The impact of number of repeats N on the interlayer exchange in [Fe/MgO]N(001) superlattices. In: Scientific Reports. Springer Nature. 2021, 11, 1942. eISSN 2045-2322. Available under: doi: 10.1038/s41598-021-81441-y
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@article{Warnatz2021-01-21impac-53157,
  year={2021},
  doi={10.1038/s41598-021-81441-y},
  title={The impact of number of repeats N on the interlayer exchange in [Fe/MgO]<sub>N</sub>(001) superlattices},
  volume={11},
  journal={Scientific Reports},
  author={Warnatz, Tobias and Magnus, Fridrik and Strandqvist, Nanny and Sanz, Sarah and Ali, Hasan and Leifer, Klaus and Vorobiev, Alexei and Hjörvarsson, Björgvin},
  note={Article Number: 1942}
}
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