Systematic Study of Ferromagnetism in Cr_xSb_2-xTe₃ Topological Insulator Thin Films using Electrical and Optical Techniques.

ABSTRACT: Ferromagnetic ordering in a topological insulator can break time-reversal symmetry, realizing dissipationless electronic states in the absence of a magnetic field. The control of the magnetic state is of great importance for future device applications. We provide a detailed systematic study of the magnetic state in highly doped Cr_xSb_2-xTe₃ thin films using electrical transport, magneto-optic Kerr effect measurements and terahertz time domain spectroscopy, and also report an efficient electric gating of ferromagnetic order using the electrolyte ionic liquid [DEME][TFSI]. Upon increasing the Cr concentration from x = 0.15 to 0.76, the Curie temperature (T_c) was observed to increase by ~5 times to 176 K. In addition, it was possible to modify the ma

SUBMITTER: Singh A 

PROVIDER: S-EPMC6242999 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature