| Автор | J M D Coey |
| Автор | J J Versluijs |
| Автор | M Venkatesan |
| Дата выпуска | 2002-10-21 |
| dc.description | A classification of half-metals is illustrated with examples of ferromagnetic and ferrimagnetic oxides. I : V characteristics and magnetoresistance of contacts between oxides with localized electrons (Fe<sub>3</sub>O<sub>4</sub>) and delocalized electrons ((La<sub>0.7</sub>Sr<sub>0.3</sub>)MnO<sub>3</sub>) are discussed. The magnetoresistance is large when the conductance of the contact is less than the quantum of conductance G<sub>0</sub>2e<sup>2</sup>/h. Broad distributions of point contacts are investigated in pressed powder compacts, illustrated by powder magnetoresistance measurements of CrO<sub>2</sub>, (La<sub>0.7</sub>Sr<sub>0.3</sub>)MnO<sub>3</sub> and Fe<sub>3</sub>O<sub>4</sub>. When exchange coupling exists across an atomic scale contact, a narrow domain wall of width comparable to the contact size may be pinned there. Some consequences are thermal magnetic mode fluctuations, nonlinear I : V characteristics due to electron pressure on the wall and current-induced switching in a bistable `peanut' device with two closely spaced nanoconstrictions. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Half-metallic oxide point contacts |
| Тип | paper |
| DOI | 10.1088/0022-3727/35/19/322 |
| Electronic ISSN | 1361-6463 |
| Print ISSN | 0022-3727 |
| Журнал | Journal of Physics D: Applied Physics |
| Том | 35 |
| Первая страница | 2457 |
| Последняя страница | 2466 |
| Аффилиация | J M D Coey; Department of Physics, Trinity College, Dublin 2, Ireland |
| Аффилиация | J J Versluijs; Department of Physics, Trinity College, Dublin 2, Ireland |
| Аффилиация | M Venkatesan; Department of Physics, Trinity College, Dublin 2, Ireland |
| Выпуск | 19 |
