Low-grade iron ores contain many impurities and are difficult to upgrade to make appropriate concentrates for the blast furnace (BF) or direct reduction (DR) technologies. In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O3) with Magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a stream of argon gas was investigated. Then, a 2500 Gaussian magnet was used for dry magnetic separation method. The effects of roasting time, ore particle size and reaction temperature on the amount of separated part and grade of the product were examined. It was found out that the hematite inside of ore could almost be completely converted into magnetite by stoichiometric ratio of coal to ore at the roasting temperature of 625 °C for 25 min. Under the optimum condition, a high amount of magnetic part of the product (72.22 wt%) with a grade of 92.7% was separated. The most important point in this process was prevention of reduced ore from re-oxidation reaction by controlling roasting atmosphere, time and temperature. In addition, different analytical methods such as X-ray fluorescence (XRF), X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG) and scanning electron microscopy (SEM) were applied to investigate and expound the results.

An investigation of the modern phenomena of condensed matter physics, called, Magnetization plateau and Magnetization jump, visible as anomalies in spin susceptibility at zero temperature, have been carried out theoretically in a zero-dimensional boron triangular Kagome lattice (0D-BTKL), namely quantum dots of BTKL, subjected to a staggering sublattice potential. By analyzing the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction, the magnetic ground state of the 0D-TKL in the presence of two magnetic adatoms, in the presence of a staggered sublattice potential is evaluated. The important salient feature of the 0D-BTKLs is the emergence of the RKKY plateaus versus the Fermi energy. The spatial configurations of the magnetic impurities dramatically change the quality and quantity of the RKKY plateaus. These RKKY plateaus have not been reported before, to the best of our knowledge. Our finite-size results successfully confirm that both the width and location of the RKKY plateaus are tunable using an external potential and Fermi energy. Another remarkable observation is the nontrivial behavior, namely the Magnetization jump, which accompanies the discontinuity in the spin susceptibility curves versus the staggering potential in our calculations. We believe that our results provide significant insights towards designing further experiments to search for the realization of the Magnetization plateau phases and Magnetization jumps in spintronics and pseudospin electronics devices based on BTKLs.

Superparamagnetic nanoparticles with high saturation magnetism and small average size were synthesized by the economic co-precipitation method. FeCl2.4H2O and FeCl3.6H2O were used as salt agents and NaOH as precipitant. Different reaction conditions were investigated to improve the saturation Magnetization of synthesized magnetic nanoparticles by adjusting the reactants' concentration and the reaction's temperature. The magnetic and structural properties of the synthesized nanoparticles were investigated by XRD and VSM, respectively. Magnetization curves were analyzed to calculate the size of the magnetic moment of nanoparticles and saturation Magnetization. For each sample, three mean magnetic sizes were estimated by employing the region of the curve in the small limit, high limit, and both small and high limits of applied magnetic fields. Their sizes were also estimated by using the Scherrer formula. The mean magnetic size estimated using the region of small applied fields was in agreement with that estimated by the Scherrer formula. Although both saturation Magnetization and the size of prepared nanoparticles were increased with reaction temperature, the saturation Magnetization of nanoparticles was enhanced from 56 to 85 emu/g. In contrast, their mean magnetic size changed only between 7 to 12 nm.

Interoduction: We consider the 1D spin-1/2 quantum compass model. At zero temperature, the behavior of the system is in the rule of quantum fluctuations. At this temperature, the model on the critical line is considered and a transverse magnetic field is applied. Using the numerical Lanczos method the ground state of the system and Magnetization for chains up to 20 spins is calculated. We have showed the depend on the exchange couplings the Magnetization remains zero up to a critical magnetic field. At high magnetic field the Magnetization saturate.Aim: Effects of transverse magnetic field in the quantum compass model has been investigated.Material and Method: In order to study the ground state properties of the system we have used Lanczos numerical method.Results: It has been shown that implementing transverse magnetic field causes to increase Magnetization slowly till a point which Magnetization reach its saturation value.Conclusion: With increasing transverse magnetic field in the quantum compass model, Magnetization will increase gradually up to a saturation value.

The high coercivity medium is necessary for magnetic information storage. The time variation of Magnetization in a varying field is studied for fabricated Fe and FeCo high coercivity samples. The rate of Magnetization reversal with different sweep-rates for magnetic field has been obtained by the hystersis loops. With the present method we can determine this quantity, just performing VSM measurements.

The Magnetization and the critical current density of newly discovered NdO0.82F0.18FeAs superconductor with a critical temperature, Tc, of 51.5 K has been studied as a function of applied magnetic field and temperature. It was found that this compound exhibits a standard superconductivity with diamagnetic onset close to Tc at a very low applied magnetic field. It was shown that there was a strong paramagnetic behavior at applied magnetic larger than 50 kOe. This behavior is clearly shown in Magnetization curves as a function of applied magnetic field.

Nickel doped CoMn ferrites with high Magnetization were synthesized by double sintering solid state route with compositions of Co0.7-xNixMn0.3Fe2O4 with x = 0, 0.05, 0.1 and 0.15. Theoretical Cation distribution for cubic spinel ferrites was suggested on basis of electrical configuration expectations and cation site preferences. Cation distribution suggested was in good agreement with experimental results obtained from VSM and XRD. Values of theoretically calculated magnetic moment, coercivity and Magnetization are in good agreement with experimental data obtained from VSM. Maximum saturation Magnetization of 37.7emu/gm is obtained for sample Co0.7Mn0.3Fe2O4 at magnetic field of 5K Oe. Magnetostriction was found to increase with increasing magnetic field (from 1KOe to 5KOe.) Maximum magnetostriction of 84ppm was observed for sample Co0.7Mn0.3Fe2O4 at 5KOe. Maximum Magnetization of magnetoelectric composites with 30% Co0.7-xNixMn0.3Fe2O4 – 70% PbZr0.48Ti0.52 was found to be 7.4 emu/g for composition with x = 0.

In this study, structural and magnetic properties of CoCrPt-NiAl thin film have been investigated for potential application in information storage media on hard disks. So, change of Ni percent in NiAl substrate and thickness of CoCrPt thin film on magnetic properties was evaluated. The thickness of thin film layer has identified using TEM and XRD analyses. The magnetic properties of the samples were measured with a vibrating sample magnetometer (VSM). Results of magnetic analyses showed that in CoCrPt-NiAl system, NiAl compound with similar atomic percent of Ni and Al (Ni50 Al50 ) and 48 nm thickness of CoCrPt thin film alloy has maximum coercivity force that is equal 1250 Oe.