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On the magnetic bistability of small iron clusters used in scanning tunneling microscopy tip preparation
- Title
- On the magnetic bistability of small iron clusters used in scanning tunneling microscopy tip preparation
- Authors
- Yu, Jisoo; Urdaniz, Corina; Namgoong, Young; Wolf, Christoph
- Ewha Authors
- Christoph Wolf
- SCOPUS Author ID
- Christoph Wolf
- Issue Date
- 2023
- Journal Title
- NEW JOURNAL OF PHYSICS
- ISSN
- 1367-2630
- Citation
- NEW JOURNAL OF PHYSICS vol. 25, no. 11
- Keywords
- STM-ESR; magnetic microtip; magnetic anisotropy energy (MAE); density functional theory; nanoscale magnetism
- Publisher
- IOP Publishing Ltd
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- The combination of electron spin resonance with scanning tunneling microscopy has resulted in a unique surface probe with sub-nm spatial and neV energy resolution. The preparation of a stable magnetic microtip is of central importance, yet, at the same time remains one of the hardest tasks. In this work, we rationalize why creating such microtips by picking up a few iron atoms often results in magnetically stable probes with two distinct magnetic states. By using density functional theory, we show that randomly formed clusters of five iron atoms can exhibit this behavior with magnetic anisotropy barriers of up to 73 meV. We explore the dependence of the magnetic behavior of such clusters on the geometrical arrangement and find a strong correlation between magnetic and geometric anisotropy-the less regular the cluster the higher its magnetic anisotropy barrier. Finally, our work rationalizes the experimental strategy of obtaining stable magnetic microtips.
- DOI
- 10.1088/1367-2630/ad0a4e
- Appears in Collections:
- 연구기관 > 양자나노과학연구소 > Journal papers
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