Hexagonal lattice of 10-nm magnetic dots
| Autor: | T. A. Winningham, Zbigniew Celinski, Robert E. Camley, K. Douglas, S. G. Whipple, Leszek Malkinski |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 93:7325-7327 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1543861 |
| Popis: | We have grown precisely ordered and precisely located arrays of ultra-small magnetic dots. The nanofabrication process is based on the use of a protein crystal etch mask which is used to create a hexagonal lattice of holes in Si substrates. An assembly of (Fe/Pd)4 dots with the average dot size of 10 nm in diameter, 6.5 nm height, and an average separation between dot centers of 22 nm was grown using molecular-beam epitaxy. The dot locations are determined by the biological mask that is used to create ordered arrays of ∼4 nm deep holes in Si. Fe/Pd multilayers (1 nm thick Fe and 0.4 nm thick Pd layers) were deposited to create dots within these holes. The dots extend ∼2.5 nm above the surface, with a thicker (1.5 nm) final layer of Pd for protection of these structures during measurements. Magneto-optical Kerr effect and magnetometry data showed that these objects are magnetic even at room temperature and are fairly soft with a coercive field of ∼40 Oe. Measurements of the hysteresis loop revealed that ma... |
| Databáze: | OpenAIRE |
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