期刊
NANOTECHNOLOGY
卷 21, 期 25, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/21/25/255602
关键词
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资金
- Focus Center Research Program-Center on Functional Engineered Nano Architectonics
- Australia Research Council (University of Queensland, Australia)
- Western Institution of Nanoelectronics
- Intel (UCLA)
We report a 'superlattice' growth method to produce well-aligned magnetic MnGe nanocolumns and nanowells by using low-temperature molecular- beam epitaxy. Both structural and magnetic properties show strong evidence of Mn5Ge3 precipitates and lattice-coherent nanostructures with different blocking temperatures. Magnetotransport measurements reveal positive and negative magnetoresistances for the nanowells and nanocolumns, respectively. This distinction can be explained by different spin scattering mechanisms under magnetic fields. Our results suggest a new growth strategy to achieve reproducible MnGe nanostructures, which facilitates the development of Ge-based spintronics and magnetoelectronics devices.
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