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Ferroelectric properties of Ge2Sb2Te5 phase-change films

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4 Author(s)
Gervacio Arciniega, J.J. ; CINVESTAV, Unidad Queretaro, Juriquilla, Querétaro 76230, Mexico ; Prokhorov, E. ; Espinoza Beltran, F.J. ; Gonzalez-Hernandez, J.

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The aim of this work is to investigate the NaCl-type to a hexagonal phase transition in Ge2Sb2Te5 films using impedance and piezoresponse force microscopy (PFM) measurements. The temperature dependence of the capacitance shows an abrupt change with a maximum at the temperature of 259 °C, which corresponds to the end from a NaCl-type to a hexagonal transition. In addition, the reciprocal capacitance for temperatures above 259 °C shows the Curie–Weiss dependence, which is typical for ferroelectric materials. Application of the external electrical field increases the degree of polarization in the NaCl-type Ge2Sb2Te5 films which allowed observing the ferroelectric domains in PFM measurements.

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Applied Physics Letters  (Volume:97 ,  Issue: 6 )