Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Focus Session: Novel 3D magnetic spin textures

MA 3.4: Hauptvortrag

Montag, 1. April 2019, 10:45–11:15, H38

Quantitative measurements of three dimensional magnetic textures using off-axis electron holography — •András Kovács¹, Nikolai Kiselev², Jan Caron¹, Thibaud Denneulin¹, Fengshan Zheng¹, Dongsheng Song¹, Stefan Blügel², and Rafal E Dunin-Borkowski¹ — ¹Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Peter Grünberg Institute, Forschungszentrum Jülich, Germany — ²Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, Germany

Nanoscale particle-like magnetization textures, such as skyrmion [1], chiral bobbers [2], and magnetic hopfions have generated considerable interest, both because of their fundamental physical properties and because they are candidates for future energy efficient recording and storage applications. However, measurements of their magnetic properties and magnetic imaging are challenging as a result of their small dimensions and three-dimensional magnetic field distributions. We use off-axis electron holography [3] in an aberration-corrected TEM to record electron optical phase images of chiral bobbers, Bloch- and Néel-type skyrmions. The phase images are analysed using a model-based iterative reconstruction algorithm to determine the magnetic moment distribution in each sample. Prospects for characterising more complex magnetic textures are discussed. [1] A. Kovacs et al, APL 111, 192410 (2017) [2] F. Zheng et al, Nat. Nanotech. 13, 451 (2018) [3] A. Kovacs and R.E. Dunin-Borkowski, Handbook of Magnetic Materials, vol. 27, p.59-153 (Ed. E.Brueck, Elsevier), 2018