Nanoscale Magnetization and Current Imaging Using Time-Resolved Scanning-Probe Magnetothermal Microscopy
Nanoscale magnetization and current imaging using scanning-probe magneto-thermal microscopy
Zhang, Chi; Bartell, Jason M.; Karsch, Jonathan C.; Gray, Isaiah; Fuchs, Gregory D.
Magnetic microscopy that combines nanoscale spatial resolution with picosecond scale temporal resolution uniquely enables direct observation of the spatiotemporal magnetic phenomena that are relevant to future high-speed, high-density magnetic storage and logic technologies. Magnetic microscopes that combine these metrics has been limited to facility-level instruments. To address this gap in lab-accessible spatiotemporal imaging, we develop a time-resolved near-field magnetic microscope based on magnetothermal interactions. We demonstrate both magnetization and current density imaging modalities, each with spatial resolution that far surpasses the optical diffraction limit. In addition, we study the near-field and time-resolved characteristics of our signal and find that our instrument possesses a spatial resolution on the scale of 100 nm and a temporal resolution below 100 ps. Our results demonstrate an accessible and comparatively low-cost approach to nanoscale spatiotemporal magnetic microscopy in a table-top form to aid the science and technology of dynamic magnetic devices with complex spin textures.
Time-resolved and current imaging studies were supported by the DOE Office of Science, Basic Energy Sciences (DE-SC0019997). Preliminary development and static magnetic imaging was supported by the AFOSR (FA9550-14-1-0243, FA9550-18-1-0408). This work made use of the Cornell Center for Materials Research Shared Facilities, which are supported through the NSF MRSEC program (DMR-1719875), and the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (Grant NNCI-2025233).
magnetic imaging; scanning probe microscopy; near-field microscopy; magnetothermal effects; spatiotemporal
ArXiv version (arXiv:2102.02792)
Previously Published As
Nano Letters, 21, 4966 (2021)
Attribution-NonCommercial 4.0 International
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