| Автор | M S Ferreira |
| Автор | J d'Albuquerque e Castro |
| Автор | R B Muniz |
| Автор | Murielle Villeret |
| Дата выпуска | 2000-03-27 |
| dc.description | A new regime of magnetoresistance (MR) in systems composed of magnetic layers separated by non-magnetic modulated structures is studied. The ability to tailor the electronic structure of superlatticed systems enables one to engineer contrasting spin-dependent transport properties, enhancing the magnetoresistance ratios. When the system acts as a spin filter the MR ratios reach values many orders of magnitude larger than those of conventional giant magnetoresistance. Rather than a mere enhancement of the magnetoresistance ratios, this new regime involves ingenious combinations of spin-polarized currents. Moreover, it results from a magnetic-field-induced metal-insulator transition along the modulation direction, characterizing a highly anisotropic transport behaviour. The existence of an insulating phase circumvents the experimental challenge of probing excessively small resistances in the current-perpendicular-to-plane (CPP) geometry of magnetoresistance. A picture in terms of the bulk Fermi surfaces of the constituent materials emerges and provides general guidelines on how to achieve this regime. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Spin filtering and an enhanced regime of giant magnetoresistance |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/12/322 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 2833 |
| Последняя страница | 2846 |
| Выпуск | 12 |
