Programme

P.23 -- Poster, VCTP-49

Date: Wednesday, 31 July 2024

Time: 08:30 - 10:00

Magnetic and magneto-caloric investigation of amorphous systems in the description of disordered Ising model

Phong H. Nguyen(1), Quan M. Le(1), Oanh K.T. Nguyen(2), Cong T. Bach(1), and Giang H. Bach(1)*

(1) Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam (2) Electric Power University, 235 Hoang Quoc Viet, Hanoi, Vietnam

The amorphous system's magnetic properties are examined using effective field theory for the disordered Ising model with binary probabilities $p$ for the greater ferromagnetic interaction $J_1$ and $(1-p)$ for the weaker ferromagnetic interaction $J_2$. Without an external field, we successfully produce the phase diagram which describes the critical temperature τc for ferromagnetic-paramagnetic phase transition depending on model parameters, probability $p$, and interacting fluctuation $\Delta$. The linear and non-linear behavior of these $\tau_c - \Delta$ curves obtained in various experiments for amorphous ribbons are well explained in the description of our models. Besides, we analyze deeply magnetocaloric effects under the influence of external fields such as magnetic entropy change consistent with experimental observations for various amorphous systems.

Presenter: Bach Giang