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

Published

November 25, 2021

Author(s)

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

Abstract

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.

Citation

Journal of Magnetism and Magnetic Materials

Volume

546

Issue

168870

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.jmmm.2021.168870

Local Download

Keywords

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

Citation

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], https://doi.org/10.1016/j.jmmm.2021.168870, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932647 (Accessed October 17, 2025)