Theoretical Study On Magnetic Properties Of Low-dimensional Materials

Magnetic recording is an important means of information storage,and it is also an area of great interest in spintronics.With the continuous miniaturization of devices,it becomes an inevitable requirement that further improvement in magnetic recording density,which makes vertical magnetic recording to replace horizontal magnetic recording as the mainstream.A key issue for perpendicular magnetic recording is obtaining materials with significant perpendicular magnetocrystalline anisotropy(PMA).It is often an effective method using an element with a large spin-orbit coupling(SOC)to construct a substrate.Because SOC and magnetocrystalline anisotropy energy(MAE)is closely related.Through the torque method and first-principles calculations,this paper studied Ta element,which is an element with a large SOC.By studying the magnetic properties of Fe/Ta and Mn/Ta structures of low-dimensional materials,we found that the MAE of Fe and Mn film on Ta(001)systems increases.At the same time,we considered the effect of strain on the MAE in the system.Then we studied the MAE in FeTa/CsPbF3 and MnTa/CsPbF3.We found that Ta is also the key to increase the MAE of the system.In MnTa/CsPbF3,the MAE changes rapidly near the Fermi level,so we tried to modulate it by injecting charge.