AFM-Based Spin-Exchange Microscopy Using Chiral Molecules
| Autor: | Meital Reches, Amir Ziv, Shira Yochelis, Hen Alpern, Lech T. Baczewski, Yossi Paltiel, Abhijit Saha, Nir Sukenik |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Spin states Magnetic logic Mechanical Engineering Ultra-high vacuum Exchange interaction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences Mechanics of Materials Microscopy General Materials Science Redistribution (chemistry) Magnetic force microscope 0210 nano-technology Nanoscopic scale |
| Zdroj: | Advanced materials (Deerfield Beach, Fla.). 31(40) |
| ISSN: | 1521-4095 |
| Popis: | Local magnetic imaging at nanoscale resolution is desirable for basic studies of magnetic materials and for magnetic logic and memories. However, such local imaging is hard to achieve by means of standard magnetic force microscopy. Other techniques require low temperatures, high vacuum, or strict limitations on the sample conditions. A simple and robust method is presented for locally resolved magnetic imaging based on short-range spin-exchange interactions that can be scaled down to atomic resolution. The presented method requires a conventional AFM tip functionalized with a chiral molecule. In proximity to the measured magnetic sample, charge redistribution in the chiral molecule leads to a transient spin state, caused by the chiral-induced spin-selectivity effect, followed by the exchange interaction with the imaged sample. While magnetic force microscopy imaging strongly depends on a large working distance, an accurate image is achieved using the molecular tip in proximity to the sample. The chiral molecules' spin-exchange interaction is found to be 150 meV. Using the tip with the adsorbed chiral molecules, two oppositely magnetized samples are characterized, and a magnetic imaging is performed. This method is simple to perform at room temperature and does not require high-vacuum conditions. |
| Databáze: | OpenAIRE |
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