Trajectory and frequency of vortex gyration in a multi-nanocontact geometry*
Li Hua-Nana),b), Liu Yana)†, Jia Mina), Du Ana)
       
a) Indication of the specific positions in one cycle of VC orbits. The red star and black dot mark the positions where the frequency shows two peaks for ( i p1, i p0, i p2) = (−1, 1, −1), and the black dot indicates the position where the frequency shows one peak for ( i p1, i p0, i p2) = (1, 1, −1). (b) The frequency induced by different forces in one cycle. Δ ω 0, Δ ω 1, Δ ω 2, Δ ω ST0, Δ ω ST1, and Δ ω ST2 indicate the frequency originating from , , , , , and , respectively. The same J and d as set in Fig.  2(a) .