Zobrazeno 1 - 10
of 74
pro vyhledávání: '"G. A. Gehring"'
Autor:
Pollyanna Kássia de Oliveira Borges, Fabiana Postiglione Mansani, Carlos Eduardo Coradassi, Lislei Teresinha Preuss, G. M. Gehring, F. Freitas Netto, Ricardo Zanetti Gomes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f491e37cbadaa507c0c279cfa3ff6b6
https://doi.org/10.5212/86967-07-4
https://doi.org/10.5212/86967-07-4
Publikováno v:
Iranian Journal of Physics Research, Vol 15, Iss 3, Pp 345-345 (2015)
Magnetite has a different electrical resistance behavior with temperatures below and above the Verwey temperature. Here, we report on Verwey transition in Fe3O4 by means of the frequency-doubled output from the Ti-sapphire laser in pump-probe experim
Externí odkaz:
https://doaj.org/article/556d64239d2042bdbedff61f3b5a0398
Autor:
Renu Sharma, J. M. Osorio Guillen, Frank J. Owens, Rajeev Ahuja, Amita Gupta, Parmanand Sharma, Börje Johansson, K. V. Rao, G. A. Gehring
Publikováno v:
Nature Materials. 2:673-677
The search for ferromagnetism above room temperature in dilute magnetic semiconductors has been intense in recent years. We report the first observations of ferromagnetism above room temperature for dilute (4 at.%) Mn-doped ZnO. The Mn is found to ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10072a84af2c9c59e5bb1a9fb39b2079
https://doi.org/10.1038/nmat984
https://doi.org/10.1038/nmat984
Publikováno v:
Journal of Magnetism and Magnetic Materials. 257:15-21
The technique of straining substrates by bending to determine the magneto-elastic constants in thin films is discussed. It is shown that the data may be corrected for the random anisotropy fields, which are present in such deposited films. The analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8698ec7ba5332a82eee962d9266e0c2f
https://doi.org/10.1016/s0304-8853(02)00981-2
https://doi.org/10.1016/s0304-8853(02)00981-2
Autor:
G. A. Gehring, Hossein Moradi
Publikováno v:
Journal of Magnetism and Magnetic Materials. 256:3-12
Brillouin light scattering spin wave studies show that the frequency and linewidth of ultrathin Co/CoO films are strongly dependent on the temperature, so that when the temperature increases, both the frequency and linewidth decrease. In this paper,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b09a3b38e09b03cef27c22b967bbe40
https://doi.org/10.1016/s0304-8853(01)00478-4
https://doi.org/10.1016/s0304-8853(01)00478-4
Autor:
G. A. Gehring, C Srinitiwarawong
Publikováno v:
Journal of Physics: Condensed Matter. 14:11589-11604
The charge and orbital states of the two-orbital spinless Hubbard model with U → ∞ in two-dimensional small clusters are investigated. This is a simplified model for cubic manganite in the ferromagnetic phase. The modified Lanczos method is used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3d556ae3a8380f5e5675622dc5ebbf8
https://doi.org/10.1088/0953-8984/14/45/303
https://doi.org/10.1088/0953-8984/14/45/303
Autor:
G. A. Gehring
Publikováno v:
Journal of Physics: Condensed Matter. 14:V5-V8
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::838ac0733d79e049e587f6ac3a252bb6
https://doi.org/10.1088/0953-8984/14/43/401
https://doi.org/10.1088/0953-8984/14/43/401
Autor:
C Srinitiwarawong, G A Gehring
Publikováno v:
Journal of Physics: Condensed Matter. 13:7987-7998
Recent experiments on magnetic tunnelling devices based on magnetite film show an unexpectedly low tunnel magnetoresistance despite a high magnetic transition temperature and a high spin polarization of the conduction electrons. The explanation is gi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc512f2d57fbbdcecd16eb4136e94264
https://doi.org/10.1088/0953-8984/13/35/306
https://doi.org/10.1088/0953-8984/13/35/306
Publikováno v:
Acta Physica Polonica A. 91:423-426
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e07d90512690e59298d5151b824f7ac1
https://doi.org/10.12693/aphyspola.91.423
https://doi.org/10.12693/aphyspola.91.423
Publikováno v:
Acta Physica Polonica A. 91:105-119
The application of real space renormalization group methods to quantum lattice models has become a topic of great interest following the development of the density matrix renormalization group by White. This method has been used to find the ground an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9187b2ecbf8b5027487012fb6bbf78c9
https://doi.org/10.12693/aphyspola.91.105
https://doi.org/10.12693/aphyspola.91.105