Spin-Dependent Tunneling Transport into CrO2 Nanorod Devices with Nonmagnetic Contacts
| Autor: | Song Jin, Yipu Song, Andrew L. Schmitt |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Magnetoresistance Spin polarization Condensed matter physics Mechanical Engineering Physics::Optics chemistry.chemical_element Bioengineering Biasing General Chemistry Condensed Matter Physics Condensed Matter::Materials Science Chromium Tunnel effect chemistry Condensed Matter::Strongly Correlated Electrons General Materials Science Nanorod Quantum tunnelling Surface states |
| Zdroj: | Nano Letters. 8:2356-2361 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/nl080038q |
| Popis: | Single-crystal nanorods of half-metallic chromium dioxide (CrO2) were synthesized and structurally characterized. Spin-dependent electrical transport was investigated in individual CrO2 nanorod devices contacted with nonmagnetic metallic electrodes. Negative magnetoresistance (MR) was observed at low temperatures due to the spin-dependent direct tunneling through the contact barrier and the high spin polarization in the half-metallic nanorods. The magnitude of this negative magnetoresistance decreases with increasing bias voltage and temperature due to spin-independent inelastic hopping through the barrier, and a small positive magnetoresistance was found at room temperature. It is believed that the contact barrier and the surface state of the nanorods have great influence on the spin-dependent transport limiting the magnitude of MR effect in this first attempt at spin filter devices of CrO2 nanorods with nonmagnetic contacts. |
| Databáze: | OpenAIRE |
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