Magnetoresistance of individual ferromagnetic GaAs/(Ga,Mn)As core-shell nanowires
| Autor: | Butschkow, Christian H., Reiger, Elisabeth, Geißler, Stefan, Rudolph, Andreas, Soda, Marcello, Schuh, Dieter, Woltersdorf, Georg, Wegscheider, Werner, Weiss, Dieter |
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| Rok vydání: | 2011 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We investigate, angle dependent, the magnetoresistance (MR) of individual self-assembled ferromagnetic GaAs/(Ga,Mn)As core-shell nanowires at cryogenic temperatures. The shape of the MR traces and the observed strong anisotropies in transport can be ascribed to the interplay of the negative magnetoresistance effect and a strong uniaxial anisotropy with the magnetic easy direction pointing along the wire axis. The magnetoresistance can be well described by a quantitative analysis based on the concept of the effective magnetic field, usually used to describe ferromagnetic resonance phenomena. The nanowires we investigate exhibit a uniaxial anisotropy which is approximately 5 times larger than the strain induced anisotropy observed in lithographically prepared (Ga,Mn)As stripes. Comment: 18 pages (pre-print), 7 figures, supporting information on last page |
| Databáze: | arXiv |
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