Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides
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152402_1_online.pdf
Description
Published version
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1.12 MB
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60b63758d4a1df69979e00fceb680371
Author(s)
Gratens, X
Ou, Yunbo
Moodera, JS
Rappl, PHO
Henriques, AB
Date Issued
April 16, 2020
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
X. Gratens, Yunbo Ou, J. S. Moodera, P. H. O. Rappl, A. B. Henriques; Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides. Appl. Phys. Lett. 13 April 2020; 116 (15): 152402.
Version
Final published version
Abstract
We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single band edge photon generates a spin polaron (SP), whose magnetic moment approaches 20 000 Bohr magnetons. This is much larger than the supergiant photoinduced SPs in antiferromagnetic europium chalcogenides, reported previously. The larger SP in ferromagnetic EuS, and still larger expected for EuO, is explained by a larger Bohr radius of the photoexcited electron state, which encircles and polarizes a greater number of lattice spins. However, because the wave function of the photoexcited electron spreads over a greater volume, the photoexcited electron's exchange interaction with individual lattice spins weakens, which makes the SP more easily quenched thermally.
MIT Department
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1063/1.5143311
