Tunable magnetocrystalline anisotropy of two-dimensional Fe₃GeTe₂ with adsorbed 5d-transition metal

Abstract

The demand for ultra-compact spintronic devices with lower energy consumption and higher storage density requires the two-dimensional (2D) magnetic materials with tunable magnetocrystalline anisotropy (MCA) energy. Employing first-principles calculations, we...

Electronic and magnetic properties of layered M3Si2Te6 (M = alkaline earth and transition metals)

“…Further studies show that pressure, electrical gating and substitution can effectively control the magnetic properties of Cr 2 Si 2 Te 6 [24][25][26][27]. Fe 3 GeTe 2 is another layered magnet, in which the ferromagnetism can be even maintained in its monolayer [28,29]. Fe 3 GeTe 2 exhibits anisotropic magnetization and the magnetism can be controlled by strain engineering [30][31][32], molecule adsorption [33,34], defect engineering [35,36], electric gating [37,38], and spin-orbit torque switch [39].…”

Intrinsic ferromagnetism in two-dimensional 1T-MX2 monolayers with tunable magnetocrystalline anisotropy

“…5,6 In contrast, previous reports show that the Fe 3 GeTe 2 monolayer is an itinerant ferromagnet with an out-of-plane magnetization, exhibiting the MCA energy of 4.078 erg cm À2 . 7 Meanwhile, extensive efforts have been devoted to achieve the tunable MCA of 2D magnetic materials for balancing the critical switching energy consumption, including charge doping, 8-10 atomic adsorption, [11][12][13] applied voltage [14][15][16] and strain engineering. [17][18][19][20] On the other hand, we notice that the 2D crystals composed of the transition metal (TMs), sulfur or nitrogen groups exhibit excellent magnetic properties.…”

Strain Tunability of Perpendicular Magnetic Anisotropy in van der Waals Ferromagnets VI3

“…Therefore, the study of 2D ferromagnetic materials with a large magnetic anisotropy and its tunability is an interesting topic. 10− 15 In comparison with 3D bulk ferromagnets, the ferromagnetic properties of vdW magnets are sensitive to external stimuli, such as hydrostatic pressure and strain. 16−18 These external forces will directly act on the inter-or intra-atomic distance and the bond angle between the transition atom and ligand in the crystal, leading to the tunability of the coercivity.…”

“…This weakens their ability to resist external magnetic interference. Therefore, the study of 2D ferromagnetic materials with a large magnetic anisotropy and its tunability is an interesting topic. − In comparison with 3D bulk ferromagnets, the ferromagnetic properties of vdW magnets are sensitive to external stimuli, such as hydrostatic pressure and strain. − These external forces will directly act on the inter- or intra-atomic distance and the bond angle between the transition atom and ligand in the crystal, leading to the tunability of the coercivity. , Although the percentage of coercivity dramatically increases in most 2D magnets by an external force, the absolute value is still less than 1 T. Generally speaking, hard ferromagnetic materials have a very strong magnetocrystalline anisotropy, which comes from a joint effect of crystal field, spin–orbit coupling (SOC), and superexchange interaction between spins. Therefore, one strategy is to apply external forces on the vdW magnets with strong MAE, tuning the coercivity by the strong spin–orbit interaction.…”