Aged‐Precursor‐Assisted Growth of Ferrimagnetic 2D Cr9Se13 with Anomalous Elasticity

Abstract 2D magnetic materials with distinct mechanical properties are of great importance for flexible spintronics. However, synthesizing 2D magnets with atomic thickness is challenging and their mechanical properties remain largely unexplored. Here, the growth of a ferrimagnetic 2D Cr 9 Se 13 with anomalous elasticity is reported by an aged‐precursor‐assisted method. The obtained 2D Cr 9 Se 13 exhibits an out‐of‐plane ferrimagnetic order with a coercivity larger than those of conventional magnetic materials. Noteworthy, it presents decent breaking strength and a Young's modulus of 52 ± 8 GPa that is among the smallest of the 2D family. This exceptional elasticity is attributed to the unique internal voids in Cr 9 Se 13 , as evidenced by the formed edge dislocations under strain. This work not only offers a facile method to synthesize 2D magnets but also develops avenues for obtaining 2D materials with desired mechanical properties, paving the way for future flexible spintronics.