Dynamic phase of transitions of the mixed spin (1/2, 3/2) Ising model in the presence of a time-varying magnetic field by using the path probability method

2021 ◽  
Vol 390 ◽  
pp. 127107
Author(s):  
Oktay İnce ◽  
Mustafa Gençaslan ◽  
Mustafa Keskin
Keyword(s):  
Magnetic Field ◽  
Ising Model ◽  
Probability Method ◽  
Time Varying ◽  
Mixed Spin ◽  
Dynamic Phase ◽  
Path Probability Method

Influences of the interaction parameters on the dynamic hysteresis of a mixed spin (1/2, 3/2) Ising model under the presence of an oscillating magnetic field

2021 ◽  
pp. 2150217
Author(s):  
Mustafa Gençaslan ◽  
Mustafa Keskin
Keyword(s):  
Magnetic Field ◽  
Ising Model ◽  
Melt Spinning ◽  
Hysteresis Loops ◽  
Exchange Interactions ◽  
Angular Frequency ◽  
Interaction Parameters ◽  
Probability Method ◽  
Dynamic Hysteresis ◽  
Mixed Spin

Within the path probability method, the influences of the interaction parameters on the dynamic hysteresis properties of a mixed spin (1/2, 3/2) Ising model driven by a time-varying magnetic field were investigated. First, we examined the effects of the interaction parameters, namely temperature, angular frequency, the rate constant and the exchange interactions on the dynamic hysteresis loops. Then, we investigated the impacts of the interaction parameters on the dynamic coercive fields and dynamic remanent magnetizations. Some of obtained results are in, qualitatively, good agreement with some theoretically reported studies as well as experimental works in some magnetic materials and the hysteresis loops obtained within the melt spinning method.

scholarly journals Weak Singularities of the Isothermal Entropy Change as the Smoking Gun Evidence of Phase Transitions of Mixed-Spin Ising Model on a Decorated Square Lattice in Transverse Field

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1533
Author(s):  
Jozef Strečka ◽  
Katarína Karl’ová
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Ising Model ◽  
Magnetocaloric Effect ◽  
Entropy Change ◽  
Transverse Magnetic ◽  
Continuous Phase ◽  
Square Lattice ◽  
Mixed Spin ◽  
Weak Singularities

The magnetocaloric response of the mixed spin-1/2 and spin-S (S>1/2) Ising model on a decorated square lattice is thoroughly examined in presence of the transverse magnetic field within the generalized decoration-iteration transformation, which provides an exact mapping relation with an effective spin-1/2 Ising model on a square lattice in a zero magnetic field. Temperature dependencies of the entropy and isothermal entropy change exhibit an outstanding singular behavior in a close neighborhood of temperature-driven continuous phase transitions, which can be additionally tuned by the applied transverse magnetic field. While temperature variations of the entropy display in proximity of the critical temperature Tc a striking energy-type singularity (T−Tc)log|T−Tc|, two analogous weak singularities can be encountered in the temperature dependence of the isothermal entropy change. The basic magnetocaloric measurement of the isothermal entropy change may accordingly afford the smoking gun evidence of continuous phase transitions. It is shown that the investigated model predominantly displays the conventional magnetocaloric effect with exception of a small range of moderate temperatures, which contrarily promotes the inverse magnetocaloric effect. It turns out that the temperature range inherent to the inverse magnetocaloric effect is gradually suppressed upon increasing of the spin magnitude S.

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