Recent Advances in Nanocontact Spin-Torque Oscillators
Artikel i vetenskaplig tidskrift, 2014

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.

Magnetodynamics

ELECTRIC-CURRENT

PHASE-LOCKING

Engineering

MODULATION

MAGNETIC DROPLET SOLITONS

POLARIZED CURRENT

GENERATION

NANO-OSCILLATORS

Physics

Electrical & Electronic

DRIVEN

spin-torque oscillator (STO)

NANOMAGNET

Applied

spin waves (SWs)

spin-transfer torque (STT)

EXCITATION

Författare

Randy K. Dumas

Göteborgs universitet

S. R. Sani

S. M. Mohseni

Ezio Iacocca

Göteborgs universitet

Y. Pogoryelov

Pranaba Muduli Kishor

Göteborgs universitet

S. Chung

Philipp Dürrenfeld

Göteborgs universitet

Johan Åkerman

Göteborgs universitet

IEEE Transactions on Magnetics

0018-9464 (ISSN)

Vol. 50 6

Ämneskategorier

Fysik

DOI

10.1109/tmag.2014.2305762