Spin Wave Modes and Dynamics of Three-Dimensional Magnetic Nanodisks under Perpendicular Resonant Magnetic Field

Ferromagnetic antidot arrays have emerged as a system of tremendous interest due to their interesting spin configuration and dynamics as well as their potential applications in magnetic storage, memory, logic, communications and sensing devices. Here, we report experimental and numerical investigation of ultrafast magnetization dynamics in a new type of antidot lattice in the form of triangular-shaped Ni80Fe20 antidots arranged in a hexagonal array. Time-resolved magneto-optical Kerr effect and micromagnetic simulations have been exploited to study the magnetization precession and spin-wave modes of the antidot lattice with varying lattice constant and in-plane orientation of the bias-magnetic field. A remarkable variation in the spin-wave modes with the orientation of in-plane bias magnetic field is found to be associated with the conversion of extended spin-wave modes to quantized ones and vice versa. The lattice constant also influences this variation in spin-wave spectra and spin-wave mode profiles. These observations are important for potential applications of the antidot lattices with triangular holes in future magnonic and spintronic devices.

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Ultrafast magnetization dynamics in a nanoscale three-dimensional cobalt tetrapod structure

Nanoscale ◽

10.1039/c7nr07843a ◽

2018 ◽

Vol 10 (21) ◽

pp. 9981-9986 ◽

Cited By ~ 10

Author(s):

Sourav Sahoo ◽

Sucheta Mondal ◽

Gwilym Williams ◽

Andrew May ◽

Sam Ladak ◽

...

Keyword(s):

Spin Wave ◽

Numerical Study ◽

Spin Dynamics ◽

Three Dimensional ◽

Magnetization Dynamics ◽

Time Resolved ◽

Complex Spin ◽

Ultrafast Magnetization ◽

Wave Modes

Time resolved measurement and numerical study of ultrafast spin dynamics in a 3D Co tetrapod structure revealed complex spin-wave modes.

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Quantized spin-wave modes in long cylindrical ferromagnetic nanowires in a transverse external magnetic field

Physical Review B ◽

10.1103/physrevb.71.180404 ◽

2005 ◽

Vol 71 (18) ◽

Cited By ~ 23

Author(s):

Elena V. Tartakovskaya

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Spin Wave ◽

Ferromagnetic Nanowires ◽

Wave Modes

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The effect of material defects on resonant spin wave modes in a nanomagnet

Scientific Reports ◽

10.1038/s41598-019-53244-9 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 1

Author(s):

Md Ahsanul Abeed ◽

Sourav Sahoo ◽

David Winters ◽

Anjan Barman ◽

Supriyo Bandyopadhyay

Keyword(s):

Magnetic Field ◽

Spin Wave ◽

Field Dependence ◽

Magnetic Field Dependence ◽

Fabrication Process ◽

Material Defects ◽

Resonant Modes ◽

Fabrication Defects ◽

Thickness Variations ◽

Wave Modes

Abstract We have theoretically studied how resonant spin wave modes in an elliptical nanomagnet are affected by fabrication defects, such as small local thickness variations. Our results indicate that defects of this nature, which can easily result from the fabrication process, or are sometimes deliberately introduced during the fabrication process, will significantly alter the frequencies, magnetic field dependence of the frequencies, and the power and phase profiles of the resonant spin wave modes. They can also spawn new resonant modes and quench existing ones. All this has important ramifications for multi-device circuits based on spin waves, such as phase locked oscillators for neuromorphic computing, where the device-to-device variability caused by defects can be inhibitory.

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