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Unidirectional spin Hall magnetoresistance in topological insulator/ferromagnetic layer heterostructures

Authors :
Lv, Yang
Kally, James
Zhang, Delin
Lee, Joon Sue
Jamali, Mahdi
Samarth, Nitin
Wang, Jian-Ping
Publication Year :
2017

Abstract

The large spin orbit coupling in topological insulators results in helical spin-textured Dirac surface states that are attractive for topological spintronics. These states generate an efficient spin-orbit torque on proximal magnetic moments at room temperature. However, memory or logic spin devices based upon such switching require a non-optimal three terminal geometry, with two terminals for the writing current and one for reading the state of the device. An alternative two terminal device geometry is now possible by exploiting the recent discovery of a unidirectional spin Hall magnetoresistance in heavy metal/ferromagnet bilayers and (at low temperature) in magnetically doped topological insulator heterostructures. We report the observation of unidirectional spin Hall magnetoresistance in a technologically relevant device geometry that combines a topological insulator with a conventional ferromagnetic metal. Our devices show a figure-of-merit (magnetoresistance per current density per total resistance) that is comparable to the highest reported values in all-metal Ta/Co bilayers.

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1701.06505
Document Type :
Working Paper
Full Text :
https://doi.org/10.1038/s41467-017-02491-3