Model-based magnetization retrieval from holographic phase images
| Autor: | Daniel Wolf, Olav Hellwig, Karin Vogel, S. Wicht, Falk Röder, Sung Hun Wee, Bernd Rellinghaus |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Physics Magnetic domain Condensed matter physics Phase (waves) Holography 02 engineering and technology Magnetic particle inspection 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Magnetic field Magnetization Magnetic anisotropy law 0103 physical sciences Single domain 0210 nano-technology Instrumentation |
| Zdroj: | Ultramicroscopy. 176:177-187 |
| ISSN: | 0304-3991 |
| Popis: | The phase shift of the electron wave is a useful measure for the projected magnetic flux density of magnetic objects at the nanometer scale. More important for materials science, however, is the knowledge about the magnetization in a magnetic nano-structure. As demonstrated here, a dominating presence of stray fields prohibits a direct interpretation of the phase in terms of magnetization modulus and direction. We therefore present a model-based approach for retrieving the magnetization by considering the projected shape of the nano-structure and assuming a homogeneous magnetization therein. We apply this method to FePt nano-islands epitaxially grown on a SrTiO3 substrate, which indicates an inclination of their magnetization direction relative to the structural easy magnetic [001] axis. By means of this real-world example, we discuss prospects and limits of this approach. |
| Databáze: | OpenAIRE |
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