Influence of the Azimuthal Angle on the Dynamic Forced Response of the Magnetization of Nanoparticles in Superimposed Ac and Dc Bias Field

2021 ◽  
Vol 18 (4) ◽  
pp. 1153-1161
Author(s):  
Malika Madani ◽  
Adda Missoum ◽  
Bachir Ouari ◽  
Sergey Titov
Keyword(s):  
Moment Method ◽  
Principal Axis ◽  
Ac Susceptibility ◽  
Azimuthal Angle ◽  
Bias Field ◽  
Forced Response ◽  
Statistical Moment ◽  
Dc Bias ◽  
Statistical Moment Method ◽  
Dc Bias Field

A consistent study of the consequence of the azimuthal angle φ on the susceptibility and the hysteresis of the nanoparticles is performed, we treat the problem with Brown’s magnetic equation thereby extending the statistical moment method. The (DMH) loops are obtained, the principal-axis of the magnetization is oriented to the direction of the field under an any azimuthal angle. It’s demonstrated that the hysteresis and the nonlinear ac susceptibility powerfully depend on the Azimuthal angle φ.

scholarly journals Coexistence of Ferromagnetic and Glassy States in Mechanically Milled GdAl2

2002 ◽  
Vol 1 (3) ◽  
Author(s):  
C Stark ◽  
P Shand ◽  
T Pekarek ◽  
D Williams ◽  
R Brown ◽  
...  
Keyword(s):  
Ac Susceptibility ◽  
Bias Field ◽  
Temperature Data ◽  
Susceptibility Data ◽  
Ferromagnetic Component ◽  
Magnetic Components ◽  
Two Component ◽  
High Temperature Data ◽  
Dc Bias ◽  
Dc Bias Field

Measurements of DC susceptibility, AC susceptibility, and AC susceptibility with an applied DC bias field were performed on mechanically milled GdAl2. A paramagnetic phase exists above a temperature T ≈ 140 K. However, there are significant deviations from the Curie-Weiss Law in this temperature regime, suggesting multiple magnetic components. Fits to the high temperature data show that two Curie-Weiss terms represent the data quite well. Below 140 K one of these magnetic components becomes ferromagnetic as indicated by a shoulder in the AC susceptibility and DC susceptibility data. This ferromagnetic component is suppressed by the application of sufficiently strong DC bias field. Accompanying this shoulder is a peak at lower temperatures (T < 50 K), which suggests the existence of another component that is magnetically glassy in nature. The two-component behavior of mechanically milled GdAl2 can be explained in terms of the nanostructure of the material, which consists of nanometer-sized grains and a disordered interphase.

Influence of Grain and Grain-Boundary Resistances on Dielectric Properties of KNbO3 Under Small DC Bias Field

2013 ◽  
Vol 96 (10) ◽  
pp. 3127-3132
Author(s):  
Sankaramangalam Ulhas Sharath ◽  
Rajesh Kumar Singh ◽  
  Raghvendra ◽  
Bheeshma Pratap Singh ◽  
Pravin Kumar ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Grain Boundary ◽  
Bias Field ◽  
Dc Bias ◽  
Dc Bias Field

THE DIFFUSION IN FCC BINARY INTERSTITIAL ALLOY

2020 ◽  
Vol 65 (10) ◽  
pp. 18-23
Author(s):  
Hoc Nguyen Quang ◽  
Loan Pham Thi Thanh ◽  
Viet Nguyen Tuan ◽  
Le Nguyen Ngoc
Keyword(s):  
Diffusion Coefficient ◽  
Moment Method ◽  
Interstitial Atom ◽  
Diffusion Theory ◽  
Correlation Factor ◽  
Statistical Moment ◽  
Analytic Expressions ◽  
Fcc Metal ◽  
Statistical Moment Method

We build the theory of diffusion for FCC binary interstitial alloy under pressure based on the statistical moment method, where there are the analytic expressions of the jumping frequency of interstitial atom, the effective jumping length, the correlation factor, the diffusion coefficient, and the activated energy. In limit cases, we can obtain the diffusion theory for FCC metal A under pressure.

scholarly journals Critical Temperature for Ordered-Disordered Phase Transformation in Cu3Au under Pressure

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Pham Dinh Tam ◽  
Bui Duc Tinh ◽  
Nguyen Quang Hoc ◽  
Pham Duy Tan
Keyword(s):  
Experimental Data ◽  
Phase Transformation ◽  
Critical Temperature ◽  
Moment Method ◽  
Statistical Moment ◽  
Disordered Phase ◽  
Good Agreement ◽  
Statistical Moment Method

We use the statistical moment method to study the dependence of the critical temperature Tc for Cu3Au on pressure in the interval from 0 to 30 kbar. The calculated mean speed of changing critical temperature to pressure is 1.8 K/kbar. This result is in a good agreement with the experimental data.

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