Permalloy (NiFe) nanometer square-antidot arrays: Dynamic modes and use as a monolithic microwave band-pass filter

•Dynamic measurements on nanometer sized Permalloy antidot arrays at GHz frequencies are presented.•We observed three modes-uniform mode, and two modes associated with finite structures.•Simulations are done by micromagnetic model and the em-wave are analyzed using analytical model.•Antidot arrays a...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-08, Vol.484, p.272-278
Main Authors: Kuanr, Bijoy K., Veerakumar, V., Camley, R.E., Celinski, Z.
Format: Article
Language:English
Subjects:
Anisotropy
Antidots
Arrays
Band-pass filter
Bandpass filters
Computer simulation
Ferrous alloys
Field emission microscopy
FMR
Frequencies
Iron compounds
Magnetic alloys
Mathematical models
Nano-holes
Network analysers
Nickel compounds
Scanning electron microscopy
Signal transmission
Spin dynamics
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Summary:•Dynamic measurements on nanometer sized Permalloy antidot arrays at GHz frequencies are presented.•We observed three modes-uniform mode, and two modes associated with finite structures.•Simulations are done by micromagnetic model and the em-wave are analyzed using analytical model.•Antidot arrays as a magnetically tunable local band-pass filter are presented. Nanometer sized Permalloy antidot arrays with different square hole sizes have been fabricated using field emission scanning electron microscopy technique. The dynamic properties of the antidot arrays are measured at GHz frequencies using a Vector Network Analyzer. For a given applied magnetic field, we observe three resonance frequencies – one corresponds to that of a uniform mode in an infinitely extended film, and the other two (above and below this mode in frequency) correspond to modes associated with finite structures. These two modes exhibit an effective uniaxial in-plane anisotropy. The static behavior of the antidot arrays are simulated using a micromagnetic model and the electromagnetic signal transmission is analyzed using an analytical model. The results show that the three different resonance frequencies are due to the different localized shape anisotropies created by the nonmagnetic holes in the antidot array. Possible application as a magnetically tunable local band-pass filter at 5G frequency band is also studied.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.04.020