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Manipulation of long-range order in two-dimensional (2D) van der Waals (vdW)magnetic materials (e.g., CrI$_3$, CrSiTe$_3$ etc.), exfoliated in few-atomiclayer, can be achieved via application of electric field,mechanical-constraint, interface engineering, or even by chemicalsubstitution/doping. Usually, active surface oxidation due to the exposure inthe ambient condition and hydrolysis in the presence of water/moisture causesdegradation in magnetic nanosheets which, in turn, affects thenanoelectronic/spintronic device performance. Counterintuitively, our currentstudy reveals that exposure to the air at ambient atmosphere results in adventof a stable nonlayered secondary ferromagnetic phase in the form ofCr$_2$Te$_3$ (T$_{C2}$ ~ 160 K) in the parent vdW magnetic semiconductorCr$_2$Ge$_2$Te$_6$ (T$_{C1}$ ~ 69 K). In addition, the magnetic anisotropyenergy (MAE) enhances in the hybrid by an order from the weakly anisotropicpristine Cr$_2$Ge$_2$Te$_6$ crystal, increasing the stability of the FM groundstate with time. Comparing with the freshly prepared Cr$_2$Ge$_2$Te$_6$, thecoexistence of the two ferromagnetic phases in the time elapsed bulk crystal isconfirmed through systematic investigation of crystal structure along withdetailed dc/ac magnetic susceptibility, specific heat, and magnetotransportmeasurement. To capture the concurrence of the two ferromagnetic phases in asingle material, Ginzburg-Landau theory with two independent order parameters(as magnetization) with a coupling term can be introduced. In contrast torather common poor environmental stability of the vdW magnets, our results openpossibilities of finding air-stable novel materials having multiple magneticphases.

Emergence of a Non-van der Waals Magnetic Phase in a van der Waals Ferromagnet