In these last years, the study on nano-oscillators gave rise to the starting point of new applications in spintronics. Here we studied systematically the excitation mode in spintronic oscillators based on the Spin-Hall effect. We studied a new structure with two layers, heavy-metal coupled with a ferromagnet. The structure used in this study has dimensions 1.5μm x 3.0 μm with rectangular shape. The two contacts are positioned above a bi-layer of (CoFeB(1nm)/ Pt(8nm)) at a distance of d=100nm. The current is injected (along the x-direction) via the two Gold contacts (Au (150nm)). We have performed a systematic study based on micromagnetic simulations to understand the origin of the exited modes and the dynamical behavior as a function of field amplitude and current. Our main results is the identification of a new mode with a spiral structure, we namely spiral mode
Dynamical response of spin-Hall nano-oscillators as function of external bias field - Presentazione orale - Conferenza internazionale
ZIVIERI, Roberto;
2015
Abstract
In these last years, the study on nano-oscillators gave rise to the starting point of new applications in spintronics. Here we studied systematically the excitation mode in spintronic oscillators based on the Spin-Hall effect. We studied a new structure with two layers, heavy-metal coupled with a ferromagnet. The structure used in this study has dimensions 1.5μm x 3.0 μm with rectangular shape. The two contacts are positioned above a bi-layer of (CoFeB(1nm)/ Pt(8nm)) at a distance of d=100nm. The current is injected (along the x-direction) via the two Gold contacts (Au (150nm)). We have performed a systematic study based on micromagnetic simulations to understand the origin of the exited modes and the dynamical behavior as a function of field amplitude and current. Our main results is the identification of a new mode with a spiral structure, we namely spiral modeI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
