Spin configurations in nanostructured magnetic rings: From DC transport to GHz spectroscopy |
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| Institution: | 1. Department of Physics, Xiamen University, Xiamen 361005, China;2. Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, China;3. Collaborative Innovation Centre for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China;1. Institute of Metal Physics UB RAS, Ekaterinburg, Russia;2. Ural Federal University, Ekaterinburg, Russia;3. Joint Institute for Nuclear Research, Dubna, Russia;1. Department of Physics, University of Science and Technology of China, Hefei, Anhui, China;2. Collaborative Innovation Center for Magnetoelectric Industry, China Three Gorges University, Yichang, Hubei, China;3. Department of Physics, Tamkang University, Taipei, Taiwan;1. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA;2. Laboratorium fuer Festkoerperphysik, ETH Zurich, 8093 Zurich, Switzerland;1. School of Environmental Science and Technology, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan;2. Center for Nanotechnology, Research Institute, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan |
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| Abstract: | We report three different experiments performed on permalloy nanorings. They address either (a) the stray-field and (b) the magnetoresistance characteristics of an individual nanoring, or (c) the magnetization dynamics of a periodic array of identical rings. Interestingly, in all three properties covering the frequency range from DC to 20 GHz we observe irreversible switching and hysteretic behavior. Localized spin waves, which are excited by ferromagnetic resonance in different ring segments, are found to obey an intriguing magnetic field dispersion. We attribute this to the characteristic spin configurations in the nanorings, i.e., the onion and the vortex states, which are controlled by the external magnetic field. |
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