Spin waves 2 components

Simulering av två magnetiska nano-kontakter med en diameter på 40 nm och ett avstånd mellan varandra på 120 nm. När spinnvågor från de båda kontakterna möts påverkas svängningarna så att de båda nano-kontakternas signaler synkroniseras med varandra -- de faslåser.

The micromagnetic simulations of nano-contact STOs were performed on a circular spin valve of 400 nm diameter composed by CoFe(20nm)/Cu(3nm)/NiFe(3nm), where the thickness is indicated in the parentheses. Here, the NiFe active magnetic layer has a saturation magnetization μoMS = 0.8 T, Gilbert damping constant α = 0.02 and exchange length λex = 5 nm. The current needed for spin torque is injected from a circular nano-contact with a diameter of 40 nm, located at the center of the spin valve. Applying a field of 0.9 T and a current of 10mA (flowing from the CoFe to the NiFe), steady magnetization precession of about 22 GHz and the propagation of spin waves are clearly visible. On the same spin valve, two nano-contacts can be also defined. With a center-to-center spacing of 120 nm, coherent synchronization is achieved.

Category:

Science & Technology

Tags:

• spin waves
• components
• Johan Åkerman
• Physics
• University of Gothenburg
• Göteborgs universitet.