scholarly journals Temperature dependence of phonons in Pd3Fe through the Curie temperature

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
F. C. Yang ◽  
O. Hellman ◽  
M. S. Lucas ◽  
H. L. Smith ◽  
C. N. Saunders ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Temperature Dependence

The temperature dependence of the photoinduced soft mode in Sn2P2S6 crystal

2019 ◽  
Vol 33 (08) ◽  
pp. 1950061
Author(s):  
K. A. Brekhov ◽  
N. A. Ilyin ◽  
E. D. Mishina ◽  
P. A. Prudkovskii ◽  
G. Kh. Kitaeva
Keyword(s):  
Phase Transition ◽  
Femtosecond Laser ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Oscillation Frequency ◽  
Phonon Mode ◽  
Soft Mode ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Curie Temperature Tc

In this paper, we present the results of the temperature dependence studies of the photoinduced phonon mode which appears in a ferroelectric-semiconductor Sn2P2S6 (SPS) crystal under the influence of femtosecond laser pulses. We show that its behavior reminds the soft mode one near the phase transition. However, the observed decrease in the oscillation frequency in the vicinity of Curie temperature Tc is much weaker than previously reported. This can be explained by the shadowing of the pure soft mode by its interaction with other photoinduced modes.

scholarly journals Curie-temperature dependence of microwave heating behavior of NixZn(1−x)Fe2O4 powders

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045320
Author(s):  
K. Kashimura ◽  
T. Namioka ◽  
T. Miyata ◽  
T. Fujii ◽  
H. Itoh ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Temperature Dependence ◽  
Microwave Heating ◽  
Heating Behavior

scholarly journals Magnetization of magnetically inhomogeneous Sr2FeMoO6-δ nanoparticles

2021 ◽  
Vol 7 (3) ◽  
pp. 85-90
Author(s):  
Gunnar Suchaneck
Keyword(s):  
Curie Temperature ◽  
Temperature Dependence ◽  
Magnetic Materials ◽  
Spin Wave ◽  
Analytical Description ◽  
Higher Order ◽  
Ferromagnetic Behavior ◽  
Double Perovskites ◽  
Langevin Function ◽  
First Time

Magnetization is a key property of magnetic materials. Nevertheless, a satisfactory, analytical description of the temperature dependence of magnetization in double perovskites such as strontium ferromolybdate is still missing. In this work, we develop, for the very first time, a model of the magnetization of nanosized, magnetically inhomogeneous Sr2FeMoO6-δ nanoparticles. The temperature dependence of magnetization was approximated by an equation consisting of a Bloch-law spin wave term, a higher order spin wave correction, both taking into account the temperature dependence of the spin-wave stiffness, and a superparamagnetic term including the Langevin function. In the limit of pure ferromagnetic behavior, the model is applicable also to SFMO ceramics. In the vicinity of the Curie temperature (T/TC > 0.85), the model fails.

Temperature Dependence of Strong Exchange Coupling in Ferrite Heterostructures

1997 ◽  
Vol 475 ◽  
Author(s):  
Y. Suzuki ◽  
R.B. Van Dover ◽  
R.J. Felder
Keyword(s):  
Thin Film ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Coercive Field ◽  
Exchange Coupling ◽  
Spinel Structure ◽  
Room Temperature ◽  
Blocking Temperature ◽  
Soft Layer ◽  
Strong Exchange

ABSTRACTSingle crystalline spinel structure ferrite thin film bilayers exhibit nearly ideal exchange coupling at room temperature. In these bilayers, the blocking temperature is only limited by the Curie temperature of the (Mn,Zn)Fe2O4. Up to the Curie temperature of the soft (Mn,Zn)Fe2O4 layer, the magnetization loops indicate that exchange anisotropy dominates the magnetization of the soft layer up to magnetic fields on the order of the coercive field of the hard CoFe2O4layer.

MAGNETO-ELASTIC PROPERTIES OF MnZnSb

1993 ◽  
Vol 07 (01n03) ◽  
pp. 895-898
Author(s):  
S. MORI ◽  
T. KANOMATA ◽  
H. YAMAUCHI ◽  
H. YOSHIDA ◽  
T. KANEKO
Keyword(s):  
Field Theory ◽  
Thermal Expansion ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Elastic Properties ◽  
Pressure Effect ◽  
Phenomenological Theory ◽  
Lattice Parameters ◽  
Molecular Field ◽  
Negative Exchange

The temperature dependence of the magnetization ,σ, the pressure effect on the Curie temperature, TC, and the thermal expansion for MnZnSb are measured. The value of dTC/dp is +3.6 K/kbar. Negative exchange strictions are observed for the lattice parameters a and c. The results are discussed using a phenomenological theory based on the molecular field theory.

Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets

2009 ◽  
Vol 152-153 ◽  
pp. 579-582 ◽  
Author(s):  
B.I. Reser ◽  
Vladimir I. Grebennikov ◽  
N.B. Melnikov
Keyword(s):  
Initial Data ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Catastrophe Theory ◽  
Spin Fluctuation ◽  
Fluctuation Theory ◽  
Magnetic Characteristics ◽  
Temperature Hysteresis ◽  
System Of Equations ◽  
Dynamic Spin

Temperature dependence of magnetic characteristics of Fe and Fe-Ni invar is considered in the dynamic nonlocal approximation of the spin-fluctuation theory. Numerical calculations show that the magnetic characteristics can have a discontinuous jump at high temperatures, well below the Curie temperature. Using methods of the catastrophe theory, we investigate the effect of small changes in the initial data on the results of the calculation. It is demonstrated that the discontinuous jump can only be smoothed but cannot be eliminated entirely without a significant change in the system of equations of the spin-fluctuation theory. Possible variants of such changes are discussed.

The Curie temperature dependence on preparation conditions for Gd thin films

2004 ◽  
Vol 459 (1-2) ◽  
pp. 191-194 ◽  
Author(s):  
Y Yamada ◽  
M Okada ◽  
P Jin ◽  
M Tazawa ◽  
K Yoshimura
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Preparation Conditions
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