| Autor: |
Iam Keong Sou, Xixiang Zhang, B. Zhang, S.K. Lok, B. You, George K.L. Wong |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Magnetics. 43:3127-3129 |
| ISSN: |
0018-9464 |
| DOI: |
10.1109/tmag.2007.893859 |
| Popis: |
A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 nm and area density of 1.5times1012 cm-2. Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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