A.C. magnetic susceptibility determination of magnetic phase transition in NiCl2 · 6H2O

1973 ◽  
Vol 44 (1) ◽  
pp. 13-14 ◽  
Author(s):  
C.Castilla Becerra ◽  
A.Paduan Filho
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Magnetic Phase Transition ◽  
Magnetic Phase

scholarly journals Thermodynamic and Relaxation Processes near Curie Point in Gadolinium

2014 ◽  
Vol 215 ◽  
pp. 113-118 ◽  
Author(s):  
Alexander P. Kamantsev ◽  
Victor V. Koledov ◽  
Vladimir G. Shavrov ◽  
Irina S. Tereshina
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Curie Point ◽  
Abrupt Change ◽  
Kinetic Coefficient ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
Specific Power ◽  
Relaxation Processes

An experimental method is suggested for the determination of the rate of magnetic phase transitions. The method is based on the measurement of the change of magnetic susceptibility of a ferromagnetic sample in the vicinity of the phase transition in response to an abrupt change of the sample temperature. This paper describes the measurement of the change of the magnetic susceptibility of a thin gadolinium plates, cooled by water-flow at a temperature below the Curie point (TC=292 K). It was found that the relaxation time of the magnetic susceptibility of gadolinium in the temperature range from 289.9 to 291.3 K can be approximated using the Landau-Khalatnikov equation with a kinetic coefficient value γ = 3.9×10-8cm3/(erg×s). The linear approximation does not fit well in the range from 291.3 to 293.2 K. The fundamental restriction of specific power of the magnetocaloric refrigerator (made by gadolinium plates) was estimated.

scholarly journals Магнитный фазовый переход в MnSi на основе LSDA+U +SO-расчетов электронной структуры и спин-флуктуационной теории

2018 ◽  
Vol 60 (10) ◽  
pp. 1882
Author(s):  
А.Г. Волков ◽  
Т.А. Ноговицына ◽  
А.А. Повзнер ◽  
Т.М. Нуретдинов
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Magnetic Phase Transition ◽  
Magnetic State ◽  
Magnetic Phase ◽  
Spin Fluctuation ◽  
Paramagnetic State ◽  
Local Magnetization ◽  
Left And Right ◽  
Weight Coefficients

AbstractSpin states appearing near the magnetic phase transition in helicoidal ferromagnet MnSi are studied on the basis of the spin-fluctuation theory and the LSDA + U + SO calculations of the electronic structure. The temperature dependence of the uniform magnetic susceptibility is calculated near the magnetic phase transition temperature, and the result agrees well with the experiment. Spin correlators corresponding to various solutions of the equation of magnetic state are determined in the region of the magnetic phase transition expanded in temperature. It is shown that, in this region, a helicoidal short-range order appears in the form of the superposition of left and right spin spirals with stochastic weight coefficients. It is shown that the magnetic susceptibility divergences on the helicoid wave vector at the temperature of disappearance of local magnetization and during the transition to the paramagnetic state.

Sign in / Sign up

Export Citation Format

Share Document