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Understanding Signatures of Emergent Magnetism in Topological Insulator/Ferrite Bilayers



Lauren J. Riddiford, Alexander Grutter, Timothy Pillsbury, Max Stanley, Danielle Reifsnyder Hickey, Peng Li, Nasim Alem, Nitin Samarth, Yuri Suzuki


Magnetic insulator and topological insulator heterostructures have been studied in search of induced magnetism in the topological insulator, but chiral edge states have been elusive. We have identified MgAl0.5Fe1.5O4/Bi2Se3 bilayers for a possible magnetic proximity effect. Electrical transport and polarized neutron reflectometry suggest a magnetic proximity effect, but structural data indicate a disordered interfacial layer to be the origin of the magnetic response. Without careful correlation of microstructure to magnetic data, a magnetic proximity effect cannot be confirmed in topological insulators.
Physical Review Letters


Topological insulator, quantum materials, Proximity effect, Magnetism, Interface, Neutron Scattering


Riddiford, L. , Grutter, A. , Pillsbury, T. , Stanley, M. , Reifsnyder Hickey, D. , Li, P. , Alem, N. , Samarth, N. and Suzuki, Y. (2022), Understanding Signatures of Emergent Magnetism in Topological Insulator/Ferrite Bilayers, Physical Review Letters (Accessed July 21, 2024)


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Created March 23, 2022, Updated November 29, 2022