Study of static and dynamic properties of planar dumbbell shaped structure of Ni80Fe20

Shankar Khanal,Pemba Sherpa,Leonard Spinu

doi:10.1063/1.5129760

Shankar Khanal, Pemba Sherpa + Show 1 more

Open Access

https://doi.org/10.1063/1.5129760

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Journal: AIP Advances	Publication Date: Dec 1, 2019
Citations: 1	License type: cc-by

Affiliation: University of New Orleans, Charles University

Abstract

In this work, planar symmetric (Dot) and non-symmetric (Nanowire) structures were combined to fabricate the modulated planar structures (Dumbbell) of Ni80Fe20. Four set of samples were fabricated on top of the signal line of coplanar waveguides with dumbbell’s axis along and perpendicular to it using methods of photolithography, electron beam lithography and liftoff. The diameter of the dots was varied to study the effect on both static and dynamic properties of modulated structures. The static magnetization reversal was investigated by NanoMOKE measurements, whereas broadband ferromagnetic resonance spectroscopy was carried out to probe the dynamic properties in GHz range. Micromagnetic simulations were performed to comprehend the experimental results in detail.

Highlights

The static and dynamic properties of micron and nano-size ferromagnetic structures have been studied extensively with the motivation of applications in spintronic, magnonic, targeted drug delivery, microwave devices and more.1–4 Magnetization reversal, nucleation and propagation of domain walls, static and dynamic properties for dot and planar nanowires have been studied in great details.5,6 Pinning of domains at modulated structure and quantify them for the purpose of magnetic memory devices was studied.7 Tunable frequency magnonic devices8 and magnonic band gap on edge modulated structure has been discussed.9 In this paper, planar dumbbell shaped structures were considered to study the static and dynamic properties
Experimental normalized magnetic hysteresis loop (MHL) for samples D-2-PA, D-4-PA, D-2-PE and D-4-PE are presented in figure 2
Zero coercivity with lower saturation magnetization field was observed for D-4-PE. To understand these experimental MHL loops, micromagnetic simulation was performed and results are presented in figure 3

Summary

Introduction

The static and dynamic properties of micron and nano-size ferromagnetic structures have been studied extensively with the motivation of applications in spintronic, magnonic, targeted drug delivery, microwave devices and more.1–4 Magnetization reversal, nucleation and propagation of domain walls, static and dynamic properties for dot and planar nanowires have been studied in great details.5,6 Pinning of domains at modulated structure and quantify them for the purpose of magnetic memory devices was studied.7 Tunable frequency magnonic devices8 and magnonic band gap on edge modulated structure has been discussed.9 In this paper, planar dumbbell shaped structures were considered to study the static and dynamic properties. The magnetization reversal process, and spin wave excitation show unique features depending on the size of the dots as well as orientation of external magnetic field with respect to structures. To understand these experimental MHL loops, micromagnetic simulation was performed and results are presented in figure 3.

Results

Conclusion