| Autor: |
Last, T., Hacia, S., Wahle, M., Fischer, S.F., Kunze, U. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 12/1/2004, Vol. 96 Issue 11, p6706-6711, 6p, 3 Black and White Photographs, 3 Diagrams, 2 Graphs |
| Abstrakt: |
Ferromagnetic electrodes of a lateral semiconductor-based spin-valve structure are designed to provide a maximum of spin-polarized injection current. A single-domain state in remanence is a prerequisite obtained by nanopatterning permalloy thin film electrodes. Three regimes of aspect ratios m are identified by room temperature magnetic force microscopy: (i) high-aspect ratios of m>=20 provide the favored remanent single-domain magnetization states, (ii) medium-aspect ratios m∼3–m∼20 yield highly remanent states with closure domains, and (iii) low-aspect ratios of m<=3 lead to multidomain structures. Lateral kinks, introduced to bridge the gap between microscale and macroscale, disturb the uniform magnetization of electrodes with high- and medium-aspect ratios. However, sloped regions (vertical flanks) help to maintain a uniformly magnetized state at the ferromagnet-semiconductor contact by domain wall pinning. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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