AUTHOR=Hirohata Atsufumi , Elphick Kelvin , Lloyd David C. , Mizukami Shigemi 

TITLE=Interfacial quality to control tunnelling magnetoresistance

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1007989

DOI=10.3389/fphy.2022.1007989

ISSN=2296-424X

ABSTRACT=<p>Theoretically, coherent tunnelling through an MgO barrier can achieve over 1,000% magnetoresistance at room temperature. To date, this has not been demonstrated experimentally. In this article, we have categorised magnetic tunnel junctions into four groups and have investigated possible causes of the reduction in their magnetoresistance by correlating their interfacial atomic structures and spin-polarised electron transport. We have concluded that the spin fluctuation induced by dislocations and disordering at a ferromagnet/barrier interface reduced the corresponding magnetoresistance.</p>