From ballistic transport to tunneling in electromigrated ferromagnetic breakjunctions.
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We fabricate ferromagnetic nanowires with constrictions whose cross section can be reduced gradually from 100 x 30 nm(2) to the atomic scale and eventually to the tunneling regime by means of electromigration. The contacts are mechanically and thermally stable. We measure low-temperature magnetoresistances (MR) <3% for contacts <400 Omega, reproducible MR variations that are nonmonotonic in the regime 400 Omega - 25 kOmega, and a maximum MR of 80% for atomic-scale widths. These results for devices > 400 Omega differ from previous room-temperature studies of electrodeposited devices. For samples in the tunneling regime, we observe large fluctuations in MR, between -10 and 85%.
Originalsprog | Engelsk |
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Tidsskrift | Nano Letters |
Vol/bind | 6 |
Udgave nummer | 1 |
Sider (fra-til) | 123-127 |
Antal sider | 5 |
ISSN | 1530-6984 |
DOI | |
Status | Udgivet - 1 jan. 2006 |
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