Self-intercalated two-dimensional magnetic semiconductor V8(S1-xSex)15

The exploration of two-dimensional (2D) magnets has attracted considerable attention due to their potential applications in spintronic devices over the past few years. Recently, a variety of 2D vanadium-based (V-based) chalcogenides have been demonstrated to own fascinating magnetic properties by both the theoretical predication and experimental realization. However, ternary V-based compounds have rarely been studied. Here, we synthesized three kinds of ultrathin ternary self-intercalated V8(S1-xSex)15 sheets with different Se contents by the atmospheric pressure chemical vapor deposition method. The Se content x is 8.7%, 12.1%, and 19.7%. The Raman spectra indicate that these three kinds of self-intercalated V8(S1-xSex)15 nanosheets with a different Se content own the same crystal structure. All self-intercalated V8(S1-xSex)15 nanosheets exhibit a semiconducting behavior, and the conducting type transits from ambipolar to p-type as the Se content increases. The spin Hall magnetoresistance (SMR) signal can be detected in the Pt/V8(S1-xSex)15 bilayer structure, and SMR signals (amplitudes) gradually weaken with the increasing temperature. These results manifest that self-intercalated V8(S1-xSex)15 own both semiconducting and magnetic characteristics.