Thermodynamics of the Heat-Flux Avalanches at the First-Order Magnetic Transition in Magnetocaloric Materials

2017 ◽  
Vol 8 (4) ◽  
Author(s):  
Marco Piazzi ◽  
Cecilia Bennati ◽  
Vittorio Basso
Keyword(s):  
Heat Flux ◽  
Magnetic Transition ◽  
First Order ◽  
Magnetocaloric Materials ◽  
Flux Avalanches

scholarly journals Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

2021 ◽  
Vol 7 (5) ◽  
pp. 60
Author(s):  
Luis M. Moreno-Ramírez ◽  
Victorino Franco
Keyword(s):  
Magnetic Field ◽  
Thermal Hysteresis ◽  
Entropy Change ◽  
Second Order ◽  
Zero Field ◽  
First Order ◽  
Magnetic Field Change ◽  
Magnetocaloric Materials ◽  
Moderate Magnetic Field ◽  
The Magnetic Field

The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the modification of the η parameter (η<1 for second-order and η>1 for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (TEC), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of TEC is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with η≈1.3−1.8 have better TEC than those corresponding to stronger first-order transitions and even second-order ones.

Influence of the Ge distribution on the first order magnetic transition of the MnFe(P,Ge) magnetocaloric material

2018 ◽  
Vol 20 (26) ◽  
pp. 18117-18126 ◽  
Author(s):  
Zhen-Lu Zhang ◽  
Dan-Min Liu ◽  
Wei-Qiang Xiao ◽  
Hui Li ◽  
Shao-Bo Wang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetic Transition ◽  
First Order

MnFe(P,Ge) is a promising magnetocaloric material for potential refrigeration applications near room temperature.

First-order magnetic transition induced by structural transition in hexagonal structure

2020 ◽  
Vol 494 ◽  
pp. 165821
Author(s):  
Chaocheng Liu ◽  
Xucai Kan ◽  
Xiansong Liu ◽  
Shuangjiu Feng ◽  
Jiyu Hu ◽  
...  
Keyword(s):  
Structural Transition ◽  
Magnetic Transition ◽  
Hexagonal Structure ◽  
First Order

What causes the first-order magnetic transition in solid 3He?

Physica B+C ◽  
1981 ◽  
Vol 108 (1-3) ◽  
pp. 849-850 ◽  
Author(s):  
P. Bak ◽  
F.B. Rasmussen
Keyword(s):  
Magnetic Transition ◽  
First Order ◽  
Solid 3He
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