Magnetic properties of Mn doped crystalline and amorphous Ge thin films grown on Si (111)

İLKNUR GÜNDÜZ AYKAÇ; AYKUT CAN ÖNEL; BURCU TOYDEMİR YAŞASUN; LEYLA ÇOLAKEROL ARSLAN

Magnetic properties of Mn doped crystalline and amorphous Ge thin films grown on Si (111)

Authors: İLKNUR GÜNDÜZ AYKAÇ, AYKUT CAN ÖNEL, BURCU TOYDEMİR YAŞASUN, LEYLA ÇOLAKEROL ARSLAN

Abstract: We investigated the effects of crystalline order on the structural and magnetic properties of ultrathin Mndoped Ge thin films grown by thermal diffusion. The dopant motion which occurs during the annealing stage appears to differ considerably depending upon whether the Ge layer is in a crystalline or an amorphous state. The details of the temperature-dependent magnetization curves reveal that the a-MnGe and c-MnGe films show ferromagnetic property up to 300K and ~250K, respectively. Ferromagnetic Mn₅ Ge₃ thin film with weakly anisotropic in-plane magnetization is formed on amorphous Ge thin film, while weakly ferromagnetic Mn₅ Ge_x Si_3-x nanostructures are developed on crystalline Ge thin film due to diffusion of Mn atoms through the Ge layer and interact with Si substrate.

Keywords: Mn-Ge ferromagnetism, solid phase epitaxy, X-ray photoelectron spectroscopy depth profiling

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