Direct measurement of magnon temperature by magneto-optic Kerr effect in YIG

2021 ◽  
Author(s):  
fayuan zhang ◽  
Yuxi Qiao ◽  
Jiajia Wang ◽  
Wenjing Liu ◽  
Shan Qiao
Keyword(s):  
Kerr Effect ◽  
Thermal Relaxation ◽  
Relaxation Length ◽  
Spatially Resolved ◽  
Spin Seebeck Effect ◽  
The Difference ◽  
Iron Garnet ◽  
Insight Into ◽  
Magneto Optic

Abstract Magnon-phonon thermal relaxation holds a fundamental role in condensed matter physics, and the difference between local phonon and magnon temperature ΔTmp as an important part of this subfield was theoretically considered responsible for the spin Seebeck effect. Experimental determination of ΔTmp is necessary to give more insight into magnon-phonon coupling. Here we report spatially resolved measurements of magnon temperature performed by magneto-optic Kerr effect in yttrium iron garnet. Our results indicate a strong interaction between magnon and phonon subsystems in YIG with an upper limit of the phonon-magnon thermal relaxation length of 1.4 mm, and means this method is valid.

Study of moving striations in plasmas. IV. Electron-energy transfer and the determination of the electron thermal relaxation length

1968 ◽  
Vol 46 (19) ◽  
pp. 2193-2200 ◽  
Author(s):  
Michel G. Drouet
Keyword(s):  
Energy Transfer ◽  
Discharge Tube ◽  
Discharge Current ◽  
Small Amplitude ◽  
Positive Column ◽  
Relative Phase ◽  
Thermal Relaxation ◽  
Plasma Parameters ◽  
Relaxation Length

A general expression relating the small variations of the electron density, the electric field, and the electron temperature in a positive column is derived. It is shown that measurements of the variations of these plasma parameters in moving striations of small amplitude and in particular of the relative phase of these variations can be used to determine the thermal relaxation length for the electrons in a positive column.The value of the electron thermal relaxation length for a positive column in neon, with a pressure of 1 Torr, discharge current 26 mA, discharge-tube diameter 6.5 cm, is found to be approximately 1 cm.

Extended longitudinal vector and Bragg magneto-optic Kerr effect for the determination of the chirality distribution in magnetic vortices

2008 ◽  
Vol 103 (9) ◽  
pp. 093913 ◽  
Author(s):  
Min-Sang Lee ◽  
Andreas Westphalen ◽  
Arndt Remhof ◽  
Alexandra Schumann ◽  
Harmut Zabel
Keyword(s):  
Kerr Effect ◽  
Magnetic Vortices ◽  
Magneto Optic

Enhancement of Magneto-optic Kerr effect of YIG nanoparticle by backscattering suppression

2019 ◽  
Vol 28 (04) ◽  
pp. 1950043
Author(s):  
Mohamad Reza Nurrahman ◽  
Dongha Kim ◽  
Min-Kyo Seo ◽  
Alexander A. Iskandar
Keyword(s):  
Scattered Field ◽  
Kerr Effect ◽  
Particle System ◽  
Multipole Moments ◽  
Reflected Wave ◽  
Parallel Component ◽  
Optical Modes ◽  
Perpendicular Component ◽  
Iron Garnet ◽  
Magneto Optic

Magneto-optic Kerr effect (MOKE) enhancement is studied for Yttrium Iron Garnet (YIG) nanoparticle. The MOKE is quantified by the ratio of the polarization components of reflected wave, namely between the perpendicular component to the parallel component with respect to the polarization of the incident wave. Thus, the enhancement of MOKE can be obtained by increasing the perpendicular component or reducing the parallel component of the reflected wave polarization. An FDTD calculation is performed to obtain the scattered field. Projecting the resulting scattered field to the vector spherical harmonic basis, we show through multipole moments analysis that the suppression of backscattering non-MO field and the raise of the backscattered MO field can be achieved by subtle superposition of some optical modes. For the specific YIG particle system and the wavelength range chosen, the result shows that enhancement of MOKE up to 7.5[Formula: see text]mrad can be achieved.

scholarly journals Determination of the magnetization profile of Co/Mg periodic multilayers by magneto-optic Kerr effect and X-ray magnetic resonant reflectivity

2013 ◽  
Vol 417 ◽  
pp. 012025
Author(s):  
P Jonnard ◽  
K Le Guen ◽  
J-M André ◽  
R Delaunay ◽  
N Mahne ◽  
...  
Keyword(s):  
Kerr Effect ◽  
X Ray ◽  
Magneto Optic

Comparison of Different Methods for Determination of Dietary Fiber

1992 ◽  
Vol 75 (4) ◽  
pp. 626-634 ◽  
Author(s):  
Mechteldis G E Wolters ◽  
Cornelis Verbeek ◽  
Johannes J M Van Westerop ◽  
Ruud J J Hermus ◽  
Alfons G J Voragen
Keyword(s):  
Dietary Fiber ◽  
Neutral Detergent Fiber ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
Soluble Dietary Fiber ◽  
Insoluble Dietary Fiber ◽  
Aoac Method ◽  
The Difference ◽  
Insight Into

Abstract Several methods are available for determination of dietary fiber. To increase insight into the relative merits of these methods, the acid-detergent fiber (ADF) and neutral-detergent fiber (NDF) methods of Van Soest et al., the Hellendoorn method, the method of Prosky et al. (AOAC method), and the Englyst method were compared with respect to the amount and the nonstarch polysaccharide (NSP) composition of dietary fiber determined in 4 food products. Our results show that the ADF/NDF detergent methods are inaccurate for the determination of cellulose, hemicellulose, and lignin, and that the NDF and Hellendoorn methods are less-suited for the determination of insoluble dietary fiber. There is a discrepancy between the amount and the NSP composition of the dietary fiber determined by the AOAC and Englyst methods. This is because of either overestimation of the amount of dietary fiber in the AOAC method (coprecipitation of oligosaccharides or Maillard reaction products) or to underestimation of the amount of dietary fiber in the Englyst method (loss of polysaccharides during hydrolysis or derivatization), or both. Differences in isolation methods lead to differences in amounts of soluble and insoluble dietary fiber found by different methods. For both the Englyst and the AOAC methods, calculation of the amount of soluble dietary fiber from the difference between total and insoluble dietary fiber is preferable, because large errors may occur in determining the soluble portion. We have shown that although different methods can yield comparable dietary fiber values, the NSP composition can vary greatly. Therefore, we recommend using those methods that determine specifically well-defined components of the dietary fiber. The chromatographic Englyst method is preferred for this reason, and because it gives insight into the type of polysaccharides present.

scholarly journals Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect

2017 ◽  
Vol 96 (18) ◽  
Author(s):  
J. Shan ◽  
L. J. Cornelissen ◽  
J. Liu ◽  
J. Ben Youssef ◽  
L. Liang ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Seebeck Effect ◽  
Relaxation Length ◽  
Spin Seebeck Effect

FRACTIONAL DETERMINATIONS OF URINARY 17-KETOSTEROIDS IN HYPEREMESIS GRAVIDARUM

1962 ◽  
Vol 41 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Pentti A. Järvinen ◽  
Sykkö Pesonen ◽  
Pirkko Väänänen
Keyword(s):  
Hyperemesis Gravidarum ◽  
First Trimester ◽  
Control Group ◽  
Before And After ◽  
Daily Urine ◽  
First Trimester Of Pregnancy ◽  
The Difference

ABSTRACT The fractional determination of 17-ketosteroids in the daily urine was performed in nine cases of hyperemesis gravidarum and in four control cases, in the first trimester of pregnancy both before and after corticotrophin administration. The excretion of total 17-KS is similar in the two groups. Only in the hyperemesis group does the excretion of total 17-KS increase significantly after corticotrophin administration. The fractional determination reveals no difference between the two groups of patients with regard to the values of the fractions U (unidentified 17-KS), A (androsterone) and Rest (11-oxygenated 17-KS). The excretion of dehydroepiandrosterone is significantly higher in the hyperemesis group than in the control group. The excretion of androstanolone seems to be lower in the hyperemesis group than in the control group, but the difference is not statistically significant. The differences in the correlation between dehydroepiandrosterone and androstanolone in the two groups is significant. The high excretion of dehydroepiandrosterone and low excretion of androstanolone in cases of hyperemesis gravidarum is a sign of adrenal dysfunction.

THE SUBJECT FIELD OF INSTITUTIONAL EDUCATION: THE SENSE AND PROSPECTS OF DEVELOPMENT IN UKRAINE

2020 ◽  
pp. 25-38
Author(s):  
Irina Mordous
Keyword(s):  
Decisive Role ◽  
Subject Field ◽  
National Education ◽  
Progressive Development ◽  
Separate Area ◽  
Economic Transformations ◽  
The Difference ◽  
The Individual ◽  
Political Economic

The development of modern civilization attests to its decisive role in the progressive development of institutions. They identified the difference between Western civilization and the rest of the world. Confirmation of the institutional advantages of the West was its early industrialization. The genesis and formation of institutionalism in its ideological and conceptualmethodological orientation occurs as a process alternative to neoclassic in the context of world heterodoxia, which quickly spread in social science. Highlighting institutional education as a separate area of sociocultural activity is determined by the factor of differentiation of institutional theory as a whole. A feature of institutional education is its orientation toward the individual and his/her transformation into a personality. The content of institutional education is revealed through the analysis of the institution, which includes a set of established customs, traditions, ways of thinking, behavioral stereotypes of individuals and social groups. The dynamics of socio-political, economic transformations in Ukraine requires a review of the foundations of national education and determination of the prospects for its development in the 21st century in the context of institutionalism.

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