Breaking the topological protection of target skyrmions by the excitation of spin wave modes under microwave magnetic field

2021 ◽  
pp. 168521
Author(s):  
Xiaochen Shen ◽  
Rongzhi Zhao ◽  
Lianze Ji ◽  
Chenglong Hu ◽  
Wenling Ren ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Microwave Magnetic Field ◽  
Wave Modes

Magnetic field dependence of quantized and localized spin wave modes in thin rectangular magnetic dots

2004 ◽  
Vol 16 (43) ◽  
pp. 7709-7721 ◽  
Author(s):  
G Gubbiotti ◽  
M Conti ◽  
G Carlotti ◽  
P Candeloro ◽  
E Di Fabrizio ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Magnetic Dots ◽  
Wave Modes

scholarly journals Field-controlled ultrafast magnetization dynamics in two-dimensional nanoscale ferromagnetic antidot arrays

2018 ◽  
Vol 9 ◽  
pp. 1123-1134 ◽  
Author(s):  
Anulekha De ◽  
Sucheta Mondal ◽  
Sourav Sahoo ◽  
Saswati Barman ◽  
Yoshichika Otani ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Lattice Constant ◽  
Magnetic Storage ◽  
Magnetization Dynamics ◽  
Bias Magnetic Field ◽  
Potential Applications ◽  
Ultrafast Magnetization ◽  
Antidot Arrays ◽  
Wave Modes

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.

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

2019 ◽  
Vol 9 (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.

Observation of spin wave modes depending on a tunable periodic magnetic field

2011 ◽  
Vol 98 (17) ◽  
pp. 172508 ◽  
Author(s):  
Lihui Bai ◽  
Makoto Kohda ◽  
Junsaku Nitta
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Periodic Magnetic Field ◽  
Wave Modes

scholarly journals Spin Wave Modes in a Cylindrical Nanowire in Crossover of Dipolar-Exchange Regime

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 25
Author(s):  
Rychły ◽  
Tkachenko ◽  
Kłos ◽  
Kuchko ◽  
Krawczyk
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Wave Spectrum ◽  
Magnetic Wires ◽  
The Impact ◽  
Exchange Regime ◽  
The Magnetic Field ◽  
Spin Wave Spectrum ◽  
Wave Modes

Although the magnetic wires have been [1] broadly investigated, some of their dynamicalproperties, like: (anti)crossing between the spin wave modes and the impact of the magnetic field onthe spin wave spectrum, still need to be explored. [...]

scholarly journals Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Alex. S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Samh Memshawy ◽  
Paolo Bortolotti ◽  
Vincent Cros ◽  
...  
Keyword(s):  
Spin Wave ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Higher Order ◽  
Spin Torque ◽  
Micromagnetic Simulations ◽  
Higher Order Modes ◽  
Spin Diode ◽  
Super High Frequency ◽  
Wave Modes

AbstractNiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

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