Dynamic and static properties of stadium-shaped antidot arrays

E Saavedra,N Vidal-Silva,J L Palma,J Escrig,R M Corona,D Altbir

doi:10.1038/s41598-020-77074-2

E Saavedra, N Vidal-Silva + Show 4 more

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https://doi.org/10.1038/s41598-020-77074-2

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Abstract

In this work we performed a detailed numerical analysis on the static and dynamic properties of magnetic antidot arrays as a function of their geometry. In particular, we explored how by varying the shape of these antidot arrays from circular holes to stadium-shaped holes, we can effectively control the magnetic properties of the array. Using micromagnetic simulations we evidenced that coercivity is very sensitive to the shape of antidots, while the remanence is more robust to these changes. Furthermore, we studied the dynamic susceptibility of these systems, finding that it is possible to control both the position and the number of resonance peaks simply by changing the geometry of the holes. Thus, this work provides useful insights on the behavior of antidot arrays for different geometries, opening routes for the design and improvement of two-dimensional technologies.

Highlights

In this work we performed a detailed numerical analysis on the static and dynamic properties of magnetic antidot arrays as a function of their geometry
It is crucial to notice that the term dynamic encodes two temporal scales according to the amplitude of spin motion: while large amplitudes are related to magnetization reversal processes by means of a constant magnetic field, small amplitudes are typically encountered in ferromagnetic resonance (FMR) experiments, which refer to the excitation and propagation of spin waves[39,40,41]
For the static behavior we focus on the angular dependence of the coercivity, remanence, and magnetization reversal modes for different values of b, which controls the geometry of the holes

Summary

Introduction

In this work we performed a detailed numerical analysis on the static and dynamic properties of magnetic antidot arrays as a function of their geometry. Low-dimensional magnetism is an emergent field in condensed matter physics whose study and understanding have provided many novel phenomena that allow the improvement of potential spintronics, magnonics, electronic, and microwave devices In this context, magnetic thin films with periodic arrays of holes, the so-called antidot arrays, have concentrated current attention since they allow exploring a broad range of applications, such as a new generation of transistors1, sensors[2,3], and ultra-high density recording m edia[4]. If we change the shape of the holes in an antidot array, both the static and dynamic properties of the system will be affected The physics behind this can be understood in terms of changes on the demagnetizing field when we vary the shape of the holes[60]. Usually known as the shape anisotropy field, depends entirely on the shape of the sample, it is expected to change, affecting the effective field of the system

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