Asymptotic superparamagnetic time constants for cubic anisotropy. II. Negative anisotropy constant

1977 ◽  
Vol 16 (3) ◽  
pp. 1285-1290 ◽  
Author(s):  
I. Eisenstein ◽  
A. Aharoni
Keyword(s):  
Anisotropy Constant ◽  
Time Constants ◽  
Cubic Anisotropy

scholarly journals Dependence of the magnetization and remanence of single-domain particles on the second cubic anisotropy constant

2001 ◽  
Vol 90 (12) ◽  
pp. 6243-6250 ◽  
Author(s):  
J. Geshev ◽  
L. G. Pereira ◽  
J. E. Schmidt ◽  
M. Mikhov
Keyword(s):  
Anisotropy Constant ◽  
Single Domain ◽  
Cubic Anisotropy

The magnetoelastic coefficients h 3 and h 4 of (100) nickel films

1972 ◽  
Vol 328 (1572) ◽  
pp. 49-65 ◽  
Keyword(s):  
Single Crystal ◽  
Saturation Magnetization ◽  
Ferromagnetic Resonance ◽  
Room Temperature ◽  
Magnetocrystalline Anisotropy ◽  
Anisotropy Constant ◽  
Published Data ◽  
Nickel Films ◽  
Splitting Factor ◽  
Cubic Anisotropy

New values have been obtained for the magnetoelastic coefficients h 3 and h 4 of nickel at room temperature from ferromagnetic resonance experiments on (100) single crystal nickel films. The ratios of h 3 / h 1 and h 4 / h 1 are found to be 0.091 ± 0.007 and 0.153 ± 0.015 respectively which give h 3 = (- 8.5 ± 0.7) x 10 -6 and h 4 = (- 14.3 ± 1.4) x 10 -6 if the Lee & Asgar value of h 3 is used (- 94 x 10 -6 ). The magnetocrystalline anisotropy constant K 1 , the saturation magnetization M and the spectroscopic splitting factor g have been measured also. It is found that K 1 = ( - 5.4 ± 0.3) x 10 4 erg/cm 3 and that g = 2.161 ± 0.009 in agreement with published data on bulk samples but that the value of M is found to be higher than the bulk value by 1.6%. The discrepancies between the values of h 3 , h 4 and M as reported here and the bulk values are discussed. The theory of feromagnetic resonance has been extended to cover the five-constant representation of magnetostriction and to the K 3 anisotropy term. The effect of the g factor having cubic anisotropy on the resonance conditions has been calculated.

Thickness dependence of cubic anisotropy constant in sputtered Fe films on GaAs substrates

2000 ◽  
Vol 284-288 ◽  
pp. 1237-1238 ◽  
Author(s):  
R Zuberek ◽  
E Mosiniewicz-Szablewska ◽  
H Szymczak ◽  
K Fronc ◽  
K Swiatek ◽  
...  
Keyword(s):  
Anisotropy Constant ◽  
Thickness Dependence ◽  
Gaas Substrates ◽  
Cubic Anisotropy

Measurement of the cubic anisotropy constant K3 of Fe films on GaN{0001}

2015 ◽  
Author(s):  
C. Gao ◽  
C. Dong ◽  
J. Herfort ◽  
O. Brandt ◽  
C. Jia ◽  
...  
Keyword(s):  
Anisotropy Constant ◽  
Cubic Anisotropy

scholarly journals Individual motion perception parameters and motion sickness frequency sensitivity in fore-aft motion

2021 ◽  
Author(s):  
Tugrul Irmak ◽  
Ksander N. de Winkel ◽  
Daan M. Pool ◽  
Heinrich H. Bülthoff ◽  
Riender Happee
Keyword(s):  
Motion Sickness ◽  
Motion Perception ◽  
Time Constant ◽  
Storage Time ◽  
Velocity Storage ◽  
Strong Positive Correlation ◽  
Subjective Vertical ◽  
Time Constants ◽  
Frequency Sensitivity ◽  
Observer Model

AbstractPrevious literature suggests a relationship between individual characteristics of motion perception and the peak frequency of motion sickness sensitivity. Here, we used well-established paradigms to relate motion perception and motion sickness on an individual level. We recruited 23 participants to complete a two-part experiment. In the first part, we determined individual velocity storage time constants from perceived rotation in response to Earth Vertical Axis Rotation (EVAR) and subjective vertical time constants from perceived tilt in response to centrifugation. The cross-over frequency for resolution of the gravito-inertial ambiguity was derived from our data using the Multi Sensory Observer Model (MSOM). In the second part of the experiment, we determined individual motion sickness frequency responses. Participants were exposed to 30-minute sinusoidal fore-aft motions at frequencies of 0.15, 0.2, 0.3, 0.4 and 0.5 Hz, with a peak amplitude of 2 m/s2 in five separate sessions, approximately 1 week apart. Sickness responses were recorded using both the MIsery SCale (MISC) with 30 s intervals, and the Motion Sickness Assessment Questionnaire (MSAQ) at the end of the motion exposure. The average velocity storage and subjective vertical time constants were 17.2 s (STD = 6.8 s) and 9.2 s (STD = 7.17 s). The average cross-over frequency was 0.21 Hz (STD = 0.10 Hz). At the group level, there was no significant effect of frequency on motion sickness. However, considerable individual variability was observed in frequency sensitivities, with some participants being particularly sensitive to the lowest frequencies, whereas others were most sensitive to intermediate or higher frequencies. The frequency of peak sensitivity did not correlate with the velocity storage time constant (r = 0.32, p = 0.26) or the subjective vertical time constant (r = − 0.37, p = 0.29). Our prediction of a significant correlation between cross-over frequency and frequency sensitivity was not confirmed (r = 0.26, p = 0.44). However, we did observe a strong positive correlation between the subjective vertical time constant and general motion sickness sensitivity (r = 0.74, p = 0.0006). We conclude that frequency sensitivity is best considered a property unique to the individual. This has important consequences for existing models of motion sickness, which were fitted to group averaged sensitivities. The correlation between the subjective vertical time constant and motion sickness sensitivity supports the importance of verticality perception during exposure to translational sickness stimuli.

scholarly journals Thermal Analysis of Stomatal Response under Salinity and High Light

2021 ◽  
Vol 22 (9) ◽  
pp. 4663
Author(s):  
Aleksandra Orzechowska ◽  
Martin Trtílek ◽  
Krzysztof Michał Tokarz ◽  
Renata Szymańska ◽  
Ewa Niewiadomska ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Initial Response ◽  
Co2 Assimilation ◽  
High Light ◽  
Stomatal Aperture ◽  
Imaging Method ◽  
Stomatal Response ◽  
Time Constants ◽  
Net Co2 Assimilation ◽  
Temporary Response

A non-destructive thermal imaging method was used to study the stomatal response of salt-treated Arabidopsis thaliana plants to excessive light. The plants were exposed to different levels of salt concentrations (0, 75, 150, and 220 mM NaCl). Time-dependent thermograms showed the changes in the temperature distribution over the lamina and provided new insights into the acute light-induced temporary response of Arabidopsis under short-term salinity. The initial response of plants, which was associated with stomatal aperture, revealed an exponential growth in temperature kinetics. Using a single-exponential function, we estimated the time constants of thermal courses of plants exposed to acute high light. The saline-induced impairment in stomatal movement caused the reduced stomatal conductance and transpiration rate. Limited transpiration of NaCl-treated plants resulted in an increased rosette temperature and decreased thermal time constants as compared to the controls. The net CO2 assimilation rate decreased for plants exposed to 220 mM NaCl; in the case of 75 mM NaCl treatment, an increase was observed. A significant decline in the maximal quantum yield of photosystem II under excessive light was noticeable for the control and NaCl-treated plants. This study provides evidence that thermal imaging as a highly sensitive technique may be useful for analyzing the stomatal aperture and movement under dynamic environmental conditions.

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