Precise control of crystallography and magnetism in focused-ion-beam transformed iron-nickel thin films
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918372852105216 |
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| author | Holobrádek, Jakub Vojáček, Libor Wojewoda, Ondřej Schmid, Michael Urbánek, Michal |
| author_facet | Holobrádek, Jakub Vojáček, Libor Wojewoda, Ondřej Schmid, Michael Urbánek, Michal |
| contents | Focused ion beam irradiation of metastable Fe$_{78}$Ni$_{22}$ thin films grown on Cu(100) substrates results in the localized transformation of the originally paramagnetic, face-centered-cubic continuous film into ferromagnetic patterns with body-centered-cubic structure. The direction of the magnetic easy axis can be controlled by the focused ion beam scanning strategy, resulting in eight differently oriented crystallographic domains with different magnetic properties. We study the local crystallographic orientations of the transformed areas by electron backscatter diffraction and correlate these results with local magnetometry measurements. The observed magnetic anisotropy can be explained as a result of residual lattice strain after the fcc$\to$bcc transformation. These results extend the understanding of this material system and its transformation and allow for the patterning of high-quality magnetic nanostructures with precisely controlled magnetization landscapes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_05242 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Precise control of crystallography and magnetism in focused-ion-beam transformed iron-nickel thin films Holobrádek, Jakub Vojáček, Libor Wojewoda, Ondřej Schmid, Michael Urbánek, Michal Materials Science Mesoscale and Nanoscale Physics Focused ion beam irradiation of metastable Fe$_{78}$Ni$_{22}$ thin films grown on Cu(100) substrates results in the localized transformation of the originally paramagnetic, face-centered-cubic continuous film into ferromagnetic patterns with body-centered-cubic structure. The direction of the magnetic easy axis can be controlled by the focused ion beam scanning strategy, resulting in eight differently oriented crystallographic domains with different magnetic properties. We study the local crystallographic orientations of the transformed areas by electron backscatter diffraction and correlate these results with local magnetometry measurements. The observed magnetic anisotropy can be explained as a result of residual lattice strain after the fcc$\to$bcc transformation. These results extend the understanding of this material system and its transformation and allow for the patterning of high-quality magnetic nanostructures with precisely controlled magnetization landscapes. |
| title | Precise control of crystallography and magnetism in focused-ion-beam transformed iron-nickel thin films |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.05242 |