Magnetic Analysis of Ultrathin Fe Films on W(011) with SFEMPA
| Autor: | Danilo Pescia, Ann-Katrin Thamm, Jiapeng Wei, Maksym Hennadiiovych Demydenko, Urs Ramsperger |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Materials science Condensed matter physics Magnetic domain Scanning electron microscope Electron Coercivity Magnetic hysteresis Secondary electrons law.invention 03 medical and health sciences Magnetization Condensed Matter::Materials Science 030104 developmental biology 0302 clinical medicine law Scanning tunneling microscope Electron Microscopy Field Emission Magnetic Imaging Ultrathin Fe Films Coercive Field 030217 neurology & neurosurgery |
| Zdroj: | 2020 33rd International Vacuum Nanoelectronics Conference (IVNC) |
| Popis: | An ultra-high vacuum Scanning Tunneling Microscope (STM) is converted into a lens-less low-energy Scanning Electron Microscope when the tip-target distance is some tens of nanometers and the tip acts as a source of field emitted electrons. This primary electron beam excites locally secondary electrons out of the sample. Those escaping the tip-target junction are analyzed according to their spin. We use this technology to measure the local magnetization versus applied magnetic field in ultrathin Fe films on W(011) at room temperature. The resulting hysteresis loop is square. The coercive field has its maximum strength between 2.2 monolayers (0.07 T) and 3 monolayers (0.025 T), being larger than 0.1 T at 2.7 monolayers and decreasing to 0.0075 T at 6 monolayers. Rotation of the magnetization, domain wall pinning at incomplete layers and lattice misfits within the Fe films are discussed as possible explanations of this “singular” behavior. © 2020 IEEE. |
| Databáze: | OpenAIRE |
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