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Microwave Signal Generation in Single-Layer Nano-Contact Spin Torque Oscillators

Journal article
Authors S. R. Sani
Philipp Dürrenfeld
S.M. Mohseni
Sunjae Chung
Johan Åkerman
Published in Ieee Transactions on Magnetics
Volume 49
Issue 7
Pages 4331-4334
ISSN 0018-9464
Publication year 2013
Published at Department of Physics (GU)
Pages 4331-4334
Language en
Keywords Single layer, spin torque oscillator, vortex, POLARIZED CURRENT, DRIVEN
Subject categories Physical Sciences


We demonstrate spin transfer torque (STT) driven microwave signal generation, from about 250 MHz to above 3 GHz, in single perm alloy layers underneath a nano-contact with diameter of 100 nm. The threshold current for signal generation is found to be strongly hysteretic, the microwave signal shows a number of harmonics, zero-field operation is straightforward, and the microwave frequency increases quasi-linearly with drive current. All observations are consistent with STT driven motion of a vortex-antivortex pair nucleated by the Oersted field underneath the nano-contact. While the generated power is about 10 dB smaller than the best GMR based nano-contact spin torque oscillators, the linewidth of 6-100 MHz is of the same order.

Page Manager: Webmaster|Last update: 9/11/2012

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