J Supercond Nov Magn DOI 10.1007/s10948-017-3995-7 ORIGINAL PAPER Study of Magnetic Properties of Fe-Doped CuO: Monte Carlo Simulations Fatima Zahra Chafi 1 · Abderrahim Jabar 2 · Lahoucine Bahmad 2 · Najem Hassanain 1 · Boubker Fares 1 · Ahmed Mzerd 1 Received: 20 December 2016 / Accepted: 23 January 2017 © Springer Science+Business Media New York 2017 Abstract Using Monte Carlo simulations, we are studying the magnetic properties of Fe-doped CuO thin films. The total magnetizations and the susceptibilities are studied as a function of the effect doping, external magnetic field, and exchange coupling. The critical temperature is discussed as a function of the effect of iron concentration. On the other hand, we investigate the effect of increasing tempera- tures on the coercive field for a constant value of exchange coupling and a fixed concentration. The coercive magnetic field is found to decrease with increasing temperature val- ues until reaching its null value. The effect of increasing the exchange coupling amount on the saturation magnetic field H s is illustrated. A linear growth of the saturation magnetic field is found as a function of the exchange coupling inter- action. To complete this study, we presented and discussed the magnetic hysteresis cycle loops. Keywords Monte Carlo simulations · Magnetic properties · Magnetization · Critical temperature · Hysteresis cycle  Fatima Zahra Chafi chafifatimazahra@gmail.com 1 Laboratory Physics of Materials (LPM), Faculty of Science, University Mohammed V, Rabat, Morocco 2 Laboratory of Magnetism and Physics of High Energy (LMPHE-URAC12), Faculty of Science, University Mohammed V, Rabat, Morocco 1 Introduction Among transition metal monoxides, copper oxide (CuO) was studied since 1986 because of its applications in dif- ferent fields and the similarity of its structure to the Cu-O planes in copper high-temperature superconductors [1, 2]. Recently, interest on this oxide was renewed when it was found that CuO is a multiferroic at high-enough temper- atures with ferroelectricity induced by antiferromagnetic ordering [3–7]. The multiferroic phase in CuO occurs in a rather narrow temperature range, from about 210 to 230 K[8, 9]. In order to change the magnetic properties of CuO, the latter was doped with various ions such as Fe [10, 11], Mn [12], Fe and Ni codoped [13], and Zn [14]. CuO was studied in several papers [15–18], and attention was focused on magnetic and dielectric properties of the particles not related to both antiferromagnetic phase tran- sitions. The magnetic properties of different materials have been studied using different methods including the mean field approximation (MFA) and Monte Carlo simulations (MCS), in connection with ferromagnetic semiconductors with higher Curie temperature [19–21]. On the other hand, several systems have been explored to study their magnetic properties for the corresponding materials with different geometrical structures [22, 23]. The scope of this work is to study the magnetic properties of Fe-doped CuO using Monte Carlo simulations. In fact, we discuss the thermal behavior of the magnetizations and the susceptibilities for different Fe doping effects, different couplings, and different temperature values. This work is organized as follows: in Section 2, we give the details of the Monte Carlo method. In Section 3, we discuss the results obtained by this method. Finally, Section 4 concludes this study.