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Imaging of Magnetic Excitations in Nanostructures with Microwave Near-Field Microscopy



Samuel Berweger, Robert Tyrrell-Ead, Houchen Chang, Mingzhong Wu, Hong Tang, Hans Nembach, Karl Stupic, Stephen E. Russek, Thomas Mitchell (Mitch) Wallis, Pavel Kabos


We present images of spin-wave excitations in a patterned yttrium iron garnet (YIG) thin film obtained by use of near-field microwave microscopy, which can achieve spatial resolution as high as 50 nm. Visualization of magnetic excitations is an enticing prospect for high-speed, high-density magnetic logic and storage applications, which has spurred the development of new magnetic microscopy and imaging techniques in recent years. Here we present a novel approach for local imaging of magnetic modes excited at room temperature with subdiffraction- limited spatial resolution. This approach is based on a special atomic force microscope with broadband GHz capability for imaging the spatial distribution of dynamic magnetic excitations in patterned magnetic structures. Due to the inherent sub-wavelength, nanometer-scale spatial resolution of near-field scanning probe techniques, this approach has potential for a significant improvement in spatial resolution over optical techniques.
Journal of Magnetism and Magnetic Materials


Yttrium iron garnet (YIG), Spin-waves, Microwave Near-field microscopy


Berweger, S. , Tyrrell-Ead, R. , Chang, H. , Wu, M. , Tang, H. , Nembach, H. , Stupic, K. , Russek, S. , Wallis, T. and Kabos, P. (2021), Imaging of Magnetic Excitations in Nanostructures with Microwave Near-Field Microscopy, Journal of Magnetism and Magnetic Materials, [online],, (Accessed February 29, 2024)
Created November 25, 2021, Updated February 9, 2023