Search results for "Magnetic imaging"
showing 6 items of 6 documents
Color centers in diamond as novel probes of superconductivity
2018
Magnetic imaging using color centers in diamond through both scanning and wide-field methods offers a combination of unique capabilities for studying superconductivity, for example, enabling accurate vector magnetometry at high temperature or high pressure, with spatial resolution down to the nanometer scale. The paper briefly reviews various experimental modalities in this rapidly developing nascent field and provides an outlook towards possible future directions.
2021
Funding Information: We acknowledge the computational resources provided by the Aalto Science-IT project. We would like to thank Marita Kattelus, Tuomas Tolvanen and Toni Auranen from Advanced Magnetic Imaging (AMI) Centre for assistance in the neuroimaging measurements. We would like to thank Helge Kainulainen for providing us with engineering help. We would also like to thank Anni Nora, Nina Ritari, Laura Schildt and Ida ?rma performing the cognitive testing. Motion Analysis Laboratory team in Helsinki University Hospital measuring and analysing the sensorimotor testing, including Piia Haakana, Kati Tammivuori, Sari Korhonen, Elina Ylitalo, Tuula Niemel?, Essi Marttinen-Rossi, Juha-Pekka …
Imaging Topological Spin Structures Using Light-Polarization and Magnetic Microscopy
2020
We present an imaging modality that enables detection of magnetic moments and their resulting stray magnetic fields. We use wide-field magnetic imaging that employs a diamond-based magnetometer and has combined magneto-optic detection (e.g. magneto-optic Kerr effect) capabilities. We employ such an instrument to image magnetic (stripe) domains in multilayered ferromagnetic structures.
Development of a scanning electron microscopy with polarization analysis system for magnetic imaging with ns time resolution and phase-sensitive dete…
2018
Scanning electron microscopy with polarization analysis is a powerful lab-based magnetic imaging technique offering simultaneous imaging of multiple magnetization components and a very high spatial resolution. However, one drawback of the technique is the long required acquisition time resulting from the low inherent efficiency of spin detection, which has limited the applicability of the technique to certain quasi-static measurement schemes and materials with high magnetic contrast. Here we demonstrate the ability to improve the signal-to-noise ratio for particular classes of measurements involving periodic excitation of the magnetic structure via the implementation of a digital phase-sens…
Propagation Length of Antiferromagnetic Magnons Governed by Domain Configurations.
2019
Spintronics seeks to functionalize antiferromagnetic materials to develop memory and logic devices operating at terahertz speed and robust against external magnetic field perturbations. To be useful, such functionality needs to be developed in thin film devices. The key functionality of long-distance spin-transport has, however, so far only been reported in bulk single crystal antiferromagnets, while in thin films, transport has so far been limited to a few nanometers. In this work, we electrically achieve a long-distance propagation of spin-information in thin films of the insulating antiferromagnet hematite. Through transport and magnetic imaging, we demonstrate a strong correlation betwe…