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Microwave Amplification by Spin Transfer Emission Radiation

Objective

The intended aim of this project is to explore the application potential of novel Spin-Transfer Oscillators (STO) as tunable and ultra-narrow band microwave radiation sources for mobile and wireless telecommunication technology. The main technological interest of STO devices, which correspond to nano-structured magnetic multilayer pumped by a spin-polarized electrical current and emitting microwave radiation, is their compatibility with monolithic integration. Our proposal specifically addresses the bottleneck issue of power conversion efficiency between dc current pumping and microwave emission of radiation. We propose to take advantage of the phase-locking mechanisms between coupled oscillators to increase significantly the device performance. Our primary objective is to engineer large arrays of coherently coupled oscillators. To achieve this goal, we shall investigate in detail 4 different types of coupling mechanism between neighboring oscillators which may induce phase-locking of the ensemble: 1) coupling through the self-generated microwave current, 2) coupling through the dipolar magnetic field, 3) coupling through the spin-diffusion of the conduction electrons, 4) coupling mediated by spin-waves. Achieving phase-locking between neighboring oscillators also requires substantial progress in our understanding of the fundamental mechanisms that are involved during momentum-transfer from spin-polarized current to the magnetic moments. Our secondary objective is to address both experimentally and theoretically 3 knowledge gaps: identifying (spatio-temporal profile and relaxation times) the fundamental spin-wave eigen-modes excited by a dc current in nano-structured magnetic heterojunctions; understanding the fundamental mechanism underlying non-local effects associated with the diffusion of spin-polarized electrons and its action on the dynamics of the whole system; investigating the magnetization dynamics of a nano-structure in the non-linear regime.

Call for proposal

FP7-NMP-2007-SMALL-1
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Funding Scheme

CP-FP - Small or medium-scale focused research project

Coordinator

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Address
Rue Leblanc 25
75015 Paris 15
France
Activity type
Research Organisations
EU contribution
€ 443 314
Administrative Contact
Olivier Klein (Dr.)

Participants (5)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France
EU contribution
€ 529 338
Address
Rue Michel Ange 3
75794 Paris
Activity type
Research Organisations
Administrative Contact
Michele Saumon (Dr.)
Westfälische Wilhelms-Universität Münster
Germany
EU contribution
€ 285 200
Address
Schlossplatz 2
48149 Muenster
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Sergei Demokritov (Prof.)
THE UNIVERSITY OF EXETER
United Kingdom
EU contribution
€ 299 918
Address
The Queen's Drive Northcote House
EX4 4QJ Exeter
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Enda Clarke (Dr.)
UNIVERSITE CATHOLIQUE DE LOUVAIN
Belgium
EU contribution
€ 288 800
Address
Place De L Universite 1
1348 Louvain La Neuve
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Luc Piraux (Prof.)
ISTITUTO P.M. SRL
Italy
EU contribution
€ 197 640
Address
Via Giuseppe Grassi 4
10138 Torino
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Konstantin Zvezdin (Dr.)