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

Nanoscale ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 9981-9986 ◽  
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.

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 The angular dependence of magnetization dynamics induced by a GHz range strain pulse

2022 ◽  
Author(s):  
Kakeru Tojo ◽  
Akira NAGAKUBO ◽  
Hirotsugu OGI
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Spin Wave ◽  
Echo Signal ◽  
Magnetization Dynamics ◽  
Time Resolved ◽  
Wave Resonance ◽  
Out Of Plane ◽  
Magneto Optical Kerr Effect ◽  
Strain Pulse

Abstract The dynamics of magnetization is important in spintronics, where the coupling between phonon and magnon attracts much attention. In this work, we study the angular dependence of the coupling between longitudinal-wave phonon and magnon. We investigated the magnetization dynamics using the time-resolved magneto-optical Kerr effect, which allows measuring spin-wave resonances and the magnetic echo signal. The frequency, mode number, and amplitude of the spin-wave resonance change with the out-of-plane angle of the external magnetic field. The amplitude of the magnetic echo signal caused by the strain pulse also changes with the angle. We calculate these angular dependences based on the Landau-Lifshitz-Gilbert equation and find that the angles of the external field and magnetic moment are important factors for the phonon-magnon coupling when phonon propagates in the thickness direction under the out-of-plane magnetic field.

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.

Coupling of spin-wave modes in extended ferromagnetic thin film antidot arrays

2005 ◽  
Vol 72 (9) ◽  
Author(s):  
S. McPhail ◽  
C. M. Gürtler ◽  
J. M. Shilton ◽  
N. J. Curson ◽  
J. A. C. Bland
Keyword(s):  
Thin Film ◽  
Spin Wave ◽  
Antidot Arrays ◽  
Wave Modes

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
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