Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Micro- and Nanostructured Materials (joint session MA/TT)

TT 7.1: Vortrag

Montag, 16. März 2020, 09:30–09:45, HSZ 403

Magnetization properties of individual 3D Fe-Co Nanostructures — •Mohanad Al Mamoori1,2, Fabrizio Porrati1, Michael Huth1, Christian Schröder3, and Jens Müller11Institute of Physics, Goethe University Frankfurt, Germany — 2Institute of Materials Science, Technical University of Darmstadt, Germany — 3Institute for Applied Materials Research, Bielefeld University of Applied Sciences, Germany

The transition from 2D to 3D nanomagnetism may bring with it the emergence of novel physical effects and enable future magnetic memory and sensing applications. In [1,2], we have employed focused electron beam induced deposition (FEBID) to grow 3D nanomagnets as nano-cubes and nano-trees directly onto a micro-Hall sensor acting both as substrate and high-resolution detection device of small magnetic stray fields. We find that the magnetisation reversal propagates by multi-vortex switching scenarios. In this presentation, firstly, we report systematic measurements of magnetic stray fields of newly grown Fe-Co tetrahedral structures as building blocks of diamond lattices as a function of temperature and magnetic field applied at different angles. Secondly, in order to gain further insights in the hysteresis loops, (irreversible) magnetic interaction effects and coercivity distributions, first-order-reversal curves (FORC) of these 3D nanomagnets supported will be shown. Finally, an outlook to the future design of such structures towards the realization of 3D artificial spin ice architectures will be given. [1] L.Keller et al., Sci. Rep. 8 , 6160 (2018). [2] M. Al Mamoori et al., Materials 11, 289 (2018).

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