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| Författare |
Sohrab Redjai Sani Johan Persson Seyed Majid Mohseni Vahid Fallahi Johan Åkerman |
|---|---|
| Publicerad i | Journal of Applied Physics |
| Volym | 109 |
| Nummer/häfte | 7 |
| ISSN | 0021-8979 |
| Publiceringsår | 2011 |
| Publicerad vid |
Institutionen för fysik (GU) |
| Språk | en |
| Länkar |
link.aip.org/link/japiau/v109/i7/p0... https://doi.org/10.1063/1.3556960 |
| Ämnesord | Magnetism, Spintronics, Nano Devices |
| Ämneskategorier | Magnetism |
We demonstrate spin transfer torque (STT) switching in multi-nanocontact STT devices fabricated using hole mask colloidal lithography. We also study the STT device resistance and switching properties as a function of applied magnetic field and nanocontact current. At low nanocontact current, magnetoresistance measurements show sharp, single-step switching at low switching fields. When the current is increased, the switching becomes multistep, and the switching field increases dramatically. We explain these results as arising from a transition from a predominantly single domain like switching to switching involving a vortex state. Micromagnetic simulations corroborate this picture, indicating that a single magnetic vortex nucleates in between the nanocontacts through the influence from the total Oersted field generated by the nanocontact ensemble.
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