The structure of La₂SrMn₂O₇ (LSMO) bilayer manganite has been investigated using the Monte Carlo simulations and ab initio calculations based on the full-potential linearized augmented plane-wave method. The ferromagnetic phase of LSMO is half-metallic with 100% spin polarization, which is important in relation to the colossal magnetoresistance properties of this compound. Thermal magnetization of LSMO bilayer manganite is obtained for several external magnetic fields h = 1, 3, 5 and 7 T. We have given the dM/dT as a function of temperatures for several external magnetic fields. The magnetic transition from ferromagnetic to paramagnetic is found. The second-order phase transition is found at the transition temperature. The temperature dependence of the magnetic entropy changes of temperatures of LSMO bilayer manganite for several external magnetic fields h = 1, 3, 5 and 7 T is also found. The field dependence of relative cooling power of LSMO bilayer manganite is given for several temperatures. Finally, the magnetic hysteresis cycle of LSMO bilayer manganite is obtained for several temperatures T = 160, 190, 213 and 220 K. The superparamagnetic behavior has been found around the transition temperature.

La ₂ SrMn ₂ O ₇（LSMO）双层锰矿的结构已使用蒙特卡洛模拟和基于全势线性化增强平面波方法从头算的方法进行了研究。LSMO的铁磁相是具有100％自旋极化的半金属，这对于该化合物的巨大磁阻特性而言很重要。在几个外部磁场h  = 1、3、5和7 T的情况下，获得了LSMO双层锰的热磁化强度。我们给出了d M / d T随多个外部磁场的温度而变化的函数。发现了从铁磁到顺磁的磁跃迁。在转变温度下发现了二阶相变。 还发现了对于几个外部磁场h = 1、3、5和7 T ，LSMO双层锰矿的温度的磁熵变的温度依赖性。给出了几种温度下LSMO双层锰铁矿相对冷却功率的场依赖性。最后，在多个温度T  = 160、190、213和220 K的情况下，获得了LSMO双层锰矿的磁滞循环。在转变温度附近发现了超顺磁行为。