Optical detection and control of magnetism in magnetic semiconductors and quantum ...
Magnetic interactions and spin polarized transport in magnetic quantum dots
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| Full text | |
| Author(s): |
Gratens, X.
[1]
;
Ou, Yunbo
[2, 3]
;
Moodera, J. S.
[2, 3, 4]
;
Rappl, P. H. O.
[5]
;
Henriques, A. B.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil
[2] MIT, Francis Bitter Magnet Lab, 77 Mass Ave, Cambridge, MA 02139 - USA
[3] MIT, Plasma Sci & Fus Ctr, 77 Mass Ave, Cambridge, MA 02139 - USA
[4] MIT, Dept Phys, 77 Mass Ave, Cambridge, MA 02139 - USA
[5] LAS INPE, Ave Astronautas, 1758 Jd Granja, BR-12227010 Sao Jose Dos Campos - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Applied Physics Letters; v. 116, n. 15 APR 13 2020. |
| Web of Science Citations: | 0 |
| 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. (AU) | |
| FAPESP's process: | 19/02407-7 - Ultrafast manipulation of the physical properties of materials |
| Grantee: | Andre Bohomoletz Henriques |
| Support Opportunities: | Regular Research Grants |