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Constraints on Proximity-Induced Ferromagnetism in a Dirac Semimetal (Cd3As2)/ferromagnetic Semiconductor (Ga1-xMnxSb)heterostructure



Arpita Mitra, Run Xiao, Wilson Yanez, Yongxi Ou, Juan Chamorro, Tyrel M. McQueen, Alexander Grutter, Julie Borchers, Michael R. Fitzsimmons, Timothy Charlton, Nitin Samarth


Breaking time-reversal symmetry in a Dirac semimetal Cd3As2 through doping with magnetic ions or by the magnetic proximity effect is expected to cause a transition to other topological phases (such as a Weyl semimetal). To this end, we investigate the possibility of proximity-induced ferromagnetic ordering in epitaxial Dirac semimetal (Cd3As2)/ferromagnetic semiconductor (Ga1−xMnxSb) heterostructures grown by molecular beam epitaxy. We report the comprehensive characterization of these heterostructures using structural probes (atomic force microscopy, x-ray diffraction, scanning transmission electron microscopy), angle-resolved photoemission spectroscopy, electrical magneto-transport, magnetometry, and polarized neutron reflectometry. Measurements of the magnetoresistance and Hall effect in the temperature range 2 K - 20 K show signatures that could be consistent with either a proximity effect or spin-dependent scattering of charge carriers in the Cd3As2 channel. Polarized neutron reflectometry sets constraints on the interpretation of the magnetotransport studies by showing that (at least for temperatures above 6 K) any induced magnetization in the Cd3As2 itself must be relatively small (< 14 emu/cm3).


Magnetism, Topology, Dirac Semimetal, Neutron Reflectometry, Magnetic Proximity Effect


Mitra, A. , Xiao, R. , Yanez, W. , Ou, Y. , Chamorro, J. , McQueen, T. , Grutter, A. , Borchers, J. , Fitzsimmons, M. , Charlton, T. and Samarth, N. (2023), Constraints on Proximity-Induced Ferromagnetism in a Dirac Semimetal (Cd3As2)/ferromagnetic Semiconductor (Ga1-xMnxSb)heterostructure, arxiv, [online], (Accessed April 18, 2024)
Created June 5, 2023, Updated September 5, 2023