Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Gratens, X."'
Autor:
Vilela, G. L. S., Stephen, G. M., Gratens, X., Galgano, G. D., Hou, Yasen, Takamura, Y., Heiman, D., Henriques, A., Berera, G., Moodera, J. S.
Rare-earth nitrides, such as gadolinium nitride (GdN), have great potential for spintronic devices due to their unique magnetic and electronic properties. GdN has a large magnetic moment, low coercitivity and strong spin polarization suitable for spi
Externí odkaz:
http://arxiv.org/abs/2309.06666
Autor:
Gratens, X., Silva, B. de Abreu, Bernardi, M. I. B., de Carvalho, H. B., Franco Jr, A., Chitta, V. A.
The magnetization of Zn1-xCoxO (0.0055 < x < 0.073) nanoparticles has been measured as a function of temperature T (1.7 K < T , 10 K) and for magnetic field up to 65 kOe using a SQUID magnetometer. Samples were synthesized by three different growth m
Externí odkaz:
http://arxiv.org/abs/2205.06213
In intrinsic magnetic semiconductors, the absorption of a single photon can generate a spin polaron, whose magnetic moment reaches many thousands of Bohr magnetons [1.2]. Here we investigate photoinduced spin polarons, using Monte Carlo simulations.
Externí odkaz:
http://arxiv.org/abs/2012.13445
Autor:
Gratens, X., Chitta, V.
The magnetization steps of quintet clusters, consisting of five identical magnetic ions coupled by isotropic nearest neighbors antiferromagnetic exchange interaction in the hcp lattice, have been investigated. In that model, called the $J_1$ model, t
Externí odkaz:
http://arxiv.org/abs/2010.06051
Autor:
Lage, V. M. Almeida, da Silva, R. T., Mesquita, A., de Godoy, M. P. F., Gratens, X., Chitta, d V. A., de Carvalho, H. B.
Publikováno v:
Journal of Alloys and Compounds 863 (2021) 158320
Polycrystalline bulk Mn:ZnO ceramics with Mn nominal concentrations of 6, 11, 17 and 22 at.% were prepared trough solid-state reaction method and subjected to a heat treatment in reducing atmosphere (Ar (95%) and H2 (5%)). The samples were studied wi
Externí odkaz:
http://arxiv.org/abs/2009.14778
Autor:
de Godoy, M. P. F., Gratens, X., Chitta, V. A., Mesquita, A., Lima Jr., M. M de, Cantarero, A., Rahman, G., Morbec, J. M., de Carvalho, H. B.
Publikováno v:
Journal of Alloys and Compounds 859 (2021) 157772
The nature of the often reported room temperature ferromagnetism in transition metal doped oxides is still a matter of huge debate. Herein we report on room temperature ferromagnetism in high quality Co-doped ZnO (Zn1-xCoxO) bulk samples synthesized
Externí odkaz:
http://arxiv.org/abs/2007.14140
Publikováno v:
Appl. Phys. Lett. 116, 152402 (2020)
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
Externí odkaz:
http://arxiv.org/abs/2003.12956
Autor:
van Kooten, S. C. P., Usachev, P. A., Gratens, X., Naupa, A. R., Chitta, V. A., Springholz, G., Henriques, A. B.
Publikováno v:
J. Appl. Phys.126,095701 (2019)
We present a simple semiclassical model to sustain that in europium chalcogenides (EuX), Faraday rotation (FR) in the transparency gap is proportional to the magnetization of the sample, irrespective of the material's magnetic phase, temperature, or
Externí odkaz:
http://arxiv.org/abs/1908.04444
Autor:
Gratens, X., de Abreu Silva, B., Bernardi, M.I.B., de Carvalho, H.B., Franco Jr., A., Chitta, V.A.
Publikováno v:
In Journal of Alloys and Compounds 15 April 2023 940
Publikováno v:
Phys. Rev. Lett. 120, 217203 (2018)
We demonstrate that light resonant with the bandgap forces the antiferromagnetic semiconducor EuSe to enter ferromagnetic alignment in the picosecond time scale. A photon generates an electron-hole pair, whose electron forms a supergiant spin polaron
Externí odkaz:
http://arxiv.org/abs/1803.05038