Manipulation of magnetic vortex parameters in disk-on-disk nanostructures with various geometry.

Maxim E Stebliy,Alexey V Ognev,Alexander G Kolesnikov,Ludmila A Chebotkevich,Alexander S Samardak

doi:10.3762/bjnano.6.70

Maxim E Stebliy, Alexey V Ognev + Show 3 more

Open Access

https://doi.org/10.3762/bjnano.6.70

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Abstract

Magnetic nanostructures in the form of a sandwich consisting of two permalloy (Py) disks with diameters of 600 and 200 nm separated by a nonmagnetic interlayer are studied. Magnetization reversal of the disk-on-disk nanostructures depends on the distance between centers of the small and big disks and on orientation of an external magnetic field applied during measurements. It is found that manipulation of the magnetic vortex chirality and the trajectory of the vortex core in the big disk is only possible in asymmetric nanostructures. Experimentally studied peculiarities of a motion path of the vortex core and vortex parameters by the magneto-optical Kerr effect (MOKE) magnetometer are supported by the magnetic force microscopy imaging and micromagnetic simulations.

Highlights

Magnetic nanostructures have a wide range of unique properties that facilitate their practical implementation in real functional devices
We have experimentally studied the effect of the orientation of the disk-on-disk nanostructure relatively to an external magnetic field on the magnetization reversal in dependence on s
The magnetization reversal of disk nanostructures depends on the distance between the centers of the small and big disks as well as on the orientation of an applied magnetic field

Summary

Introduction

Magnetic nanostructures have a wide range of unique properties that facilitate their practical implementation in real functional devices. The MFM study showed that the magnetization reversal is similar to the processes in a symmetric structure: The single-domain state forms in the small disk, and the vortex forms in the big disk.

Results

Conclusion