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technical paper
Magnetic Switching and Stoner Wohlfarth Model of 2D Single Domain Magnets
Due to the strong spin fluctuation in two dimensions, the magnitude of the magnetization is highly dependent on both the exchange interaction and the magnetic anisotropy at any finite temperature and the existence of an energy gap is essential for the long-range order, which is known as the Wigner and Mermin theorem. As a result, the process of magnetic switching for the 2D magnets is completely different from the process we know for the 3D case. We show here several fundamentally different hysteresis properties between 2D and 3D magnets. The magnetization switching diagram known as the asteroid figure in the conventional Stoner-Wohlfarth model becomes highly temperature-dependent and asymmetric with respect to the transverse and longitudinal magnetic fields. Also, we show the difference in the magnetic switching dynamics between both cases. Our results provide new insights for 2D magnetic materials-based spintronics applications.