Broadband spin dynamics of Permalloy rings in the circulation state

Xiaobin Zhu; Malac, Marek; Zhigang Liu; Hui Qian; Metlushko, Vitali; Freeman, Mark R.
June 2005
Applied Physics Letters;6/27/2005, Vol. 86 Issue 26, p262502
Academic Journal
The spin dynamics of the remanent state of circulating magnetization in micrometer-scale Permalloy rings is studied by broadband ferromagnetic resonance. A number of resonance modes are observed, depending upon the geometries of coupling the transient excitation to the ring and of magneto-optically monitoring the response. The two dominant modes involve precession with uniform phase around the ring, or in a circularly antisymmetric standing wave pattern with two nodes. Other magnetic normal modes are also excited but with much smaller amplitude.


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