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Recent Advances in Nanocontact Spin-Torque Oscillators

Journal article
Authors Randy K. Dumas
S. R. Sani
S. M. Mohseni
Ezio Iacocca
Yevgen Pogoryelov
Pranaba Muduli Kishor
S. Chung
Philipp Dürrenfeld
Johan Åkerman
Published in Ieee Transactions on Magnetics
Volume 50
Issue 6
ISSN 0018-9464
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1109/tmag.2014.230576...
Keywords Magnetodynamics, spin waves (SWs), spin-torque oscillator (STO), spin-transfer torque (STT), MAGNETIC DROPLET SOLITONS, PHASE-LOCKING, POLARIZED CURRENT, NANO-OSCILLATORS, ELECTRIC-CURRENT, MODULATION, NANOMAGNET, EXCITATION, DRIVEN, GENERATION, Engineering, Electrical & Electronic, Physics, Applied
Subject categories Physical Sciences

Abstract

We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni](4) orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.

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