Current induced vortices in multi-nanocontact spin-torque devices

Mohseni, S. M. (author)

Fallahi, Vahid (author)

Åkerman, Johan (author): Gothenburg University,Göteborgs universitet,KTH,Materialfysik, MF,Institutionen för fysik (GU),Department of Physics (GU)

(creator_code:org_t)

AIP Publishing, 2011
2011
English.
In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 109:7, s. 07C913-

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; https://gup.ub.gu.se...; show less...

Abstract Subject headings

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.

By the author/editor: Sani, Sohrab R; Persson, Johan; Mohseni, S. M.; Fallahi, Vahid; Åkerman, Johan

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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