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Current induced vortices in multi-nanocontact spin-torque devices

Journal article
Authors Sohrab Redjai Sani
Johan Persson
Seyed Majid Mohseni
Vahid Fallahi
Johan Åkerman
Published in Journal of Applied Physics
Volume 109
Issue 7
ISSN 0021-8979
Publication year 2011
Published at Department of Physics (GU)
Language en
Keywords Magnetism, Spintronics, Nano Devices
Subject categories 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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