Damping factor estimation using spin wave attenuation in permalloy film

2015 ◽  
Vol 117 (17) ◽  
pp. 17D121 ◽  
Author(s):  
Takashi Manago ◽  
Kazuto Yamanoi ◽  
Shinya Kasai ◽  
Seiji Mitani
Keyword(s):  
Spin Wave ◽  
Wave Attenuation ◽  
Damping Factor ◽  
Permalloy Film ◽  
Factor Estimation

Propagating spin wave spectroscopy in a permalloy film: A quantitative analysis

2003 ◽  
Vol 83 (5) ◽  
pp. 972-974 ◽  
Author(s):  
Matthieu Bailleul ◽  
Dominik Olligs ◽  
Claude Fermon
Keyword(s):  
Quantitative Analysis ◽  
Spin Wave ◽  
Permalloy Film

Current-Induced Control of Spin-Wave Attenuation

2009 ◽  
Vol 102 (14) ◽  
Author(s):  
Soo-Man Seo ◽  
Kyung-Jin Lee ◽  
Hyunsoo Yang ◽  
Teruo Ono
Keyword(s):  
Spin Wave ◽  
Wave Attenuation

Spin Wave Excitation and Propagation Properties in a Permalloy Film

2013 ◽  
Vol 52 (8R) ◽  
pp. 083001 ◽  
Author(s):  
Kazuto Yamanoi ◽  
Satoshi Yakata ◽  
Takashi Kimura ◽  
Takashi Manago
Keyword(s):  
Spin Wave ◽  
Wave Excitation ◽  
Permalloy Film ◽  
Spin Wave Excitation ◽  
Propagation Properties

scholarly journals A study on the drag coefficient in wave attenuation by vegetation

2021 ◽  
Author(s):  
Zhilin Zhang ◽  
Bensheng Huang ◽  
Chao Tan ◽  
Hui Chen ◽  
Xiangju Cheng
Keyword(s):  
Drag Coefficient ◽  
Wave Height ◽  
Large Scale ◽  
Wave Attenuation ◽  
Damping Factor ◽  
Human Beings ◽  
Incoming Wave ◽  
Local Wave ◽  
Wave Height Attenuation ◽  
New Equation

Abstract. Vegetation in wetlands is a large-scale nature-based resource providing a myriad of services for human beings and the environment, such as dissipating incoming wave energy and protecting coastal areas. For understanding wave height attenuation by vegetation, there are two main traditional calibration approaches to the drag effect acting on the vegetation. One of them is based on the rule that wave height decays through the vegetated area by a reciprocal function and another by an exponential function. In both functions, the local wave height reduces with distance from the beginning of the vegetation depending on a damping factor (Eqs. (1) and (4)). These damping factors α' and k' are linked to the drag coefficient CD and measurable parameters (Eqs. (3) and (5)). So there are two methods to predict CD that quantify the effect of vegetation. In this study, a new equation is derived that connects these two damping factors (Eq. (12)). The different relations and methods to predicting the drag coefficient CD have been investigated by 99 laboratory experiments. Finally, different relations between CD and relevant parameters (Re, KC, and Ur) have been analyzed. The results show that α' approximately equals k' only for fully submerged vegetation, while the new equation can be used for both emerged and submerged canopy. It appears that the methods for predicting CD by Dean (1979) and Kobayashi et al. (1993) are consistent with the well-recognized method by Dalrymple et al. (1984) for submerged vegetated canopy. But when the vegetation emerges, only the new method based on Eq. (12) leads to almost the same results as Dalrymple et al. (1984). Hence, Eq. (12) has built a bridge between these two approaches for the wave attenuation by vegetation and has proved applicable to emergent conditions of vegetation as well.

scholarly journals Control of propagating spin-wave attenuation by the spin-Hall effect

2017 ◽  
Vol 122 (9) ◽  
pp. 093901 ◽  
Author(s):  
Seonghoon Woo ◽  
Geoffrey S. D. Beach
Keyword(s):  
Hall Effect ◽  
Spin Wave ◽  
Wave Attenuation ◽  
Spin Hall Effect

OPTICALLY MEASURED SPIN-WAVE MODE-SPECTRUM IN A ROLLED-UP PERMALLOY FILM WITH TIME-RESOLVED SCANNING-KERR-MICROSCOPY

SPIN ◽  
2013 ◽  
Vol 03 (03) ◽  
pp. 1340007 ◽  
Author(s):  
DANIEL MELLEM ◽  
JAN-NIKLAS TOEDT ◽  
FELIX BALHORN ◽  
SEBASTIAN MANSFELD ◽  
WOLFGANG HANSEN ◽  
...  
Keyword(s):  
Spin Wave ◽  
Wave Spectrum ◽  
Wave Mode ◽  
Permalloy Film ◽  
Time Resolved ◽  
Mode Spectrum ◽  
Field Dependent ◽  
Spin Wave Mode ◽  
The Magnetic Field ◽  
Spin Wave Spectrum

We investigate the magnetic field-dependent spin-wave spectrum of a rolled-up permalloy film by means of time-resolved scanning-Kerr-microscopy. We find several quantized spin-wave modes including the ferromagnetic resonance of the structure.

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