Hu S, Cui X, Wang K, Yakata S, Kimura T. Significant Modulation of Vortex Resonance Spectra in a Square-Shape Ferromagnetic Dot.
NANOMATERIALS 2022;
12:nano12132295. [PMID:
35808133 PMCID:
PMC9267980 DOI:
10.3390/nano12132295]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/01/2022] [Accepted: 07/02/2022] [Indexed: 02/04/2023]
Abstract
The resonance property of a magnetic vortex contained within a micron-sized square Py dot was detected using an amplitude-modulated magnetic field excitation technique. We found a significant modulation of the resonant spectra as the external magnetic field changes. The Lorentzian-like spectrum changes from a peak to a dip via a transition of anti-Lorentzian-like spectra. By conducting the micromagnetic simulations, we confirmed that the transition behavior results from the unusual resistance change depending on the vortex core center position. Additionally, the power dependence of the anti-Lorentzian-like spectra revealed a fairly persistent coexistence of peak and dip. Thus, the tunable spectra suggest one way to develop an integratable radiofrequency microcircuits.
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