@Article{HenriquesGalgRappAbra:2016:LiPoMa,
author = "Henriques, A. B. and Galgano, G. D. and Rappl, Paulo Henrique de
Oliveira and Abramof, Eduardo",
affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Light-induced polaron magnetization in EuTe at temperatures
reaching 150 K",
journal = "Physical Review B: Condensed Matter and Materials Physics",
year = "2016",
volume = "93",
number = "20",
pages = "201201",
month = "May",
abstract = "We demonstrate that light creates a highly magnetized region in a
magnetic semiconductor far above its critical temperature. A
near-gap photon generates a quasiparticle of nonzero magnetic
moment, named magnetic polaron, which is constituted by the
photoexcited electron and about 1000 spin-polarized lattice atoms
surrounding the photoexcited electron. The photoinduced
magnetization follows a Langevin function, whose shape uniquely
determines the magnetic moment of an individual polaron. In EuTe
at 5 K the magnetic moment reaches a giant value of over 500 Bohr
magnetons, thus the photoinduced magnetization saturates with a
magnetic field of only 50 mT, which characterizes the magnetic
polaron system as superparamagnetic. The polaron has an average
lifetime of 15\μs. When temperature is increased its
magnetic moment decreases, but at 150 K it still has a large value
of about 80 Bohr magnetons. The paramagnet of polarons is fully
controlled by light. Because the magnetic polaron affects only
spin orientation, but not the charge distribution, in the
superparamagnetic state the ideal optical quality of the host
semiconductor is preserved.",
doi = "10.1103/PhysRevB.93.201201",
url = "http://dx.doi.org/10.1103/PhysRevB.93.201201",
issn = "1098-0121",
language = "en",
urlaccessdate = "28 abr. 2024"
}