Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces

Thach D.N. Ngo, Jung-Won Chang, Kyujoon Lee, Seungju Han, Joon Sung Lee, Young Heon Kim, Myung-Hwa Jung, Yong-Joo Doh, Mahn-Soo Choi, Jonghyun Song () and Jinhee Kim ()
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Thach D.N. Ngo: Korea Research Institute of Standards and Science
Jung-Won Chang: Korea Research Institute of Standards and Science
Kyujoon Lee: Sogang University
Seungju Han: Korea University
Joon Sung Lee: Korea University Sejong Campus
Young Heon Kim: Korea Research Institute of Standards and Science
Myung-Hwa Jung: Sogang University
Yong-Joo Doh: Korea University Sejong Campus
Mahn-Soo Choi: Korea University
Jonghyun Song: Chungnam National University
Jinhee Kim: Korea Research Institute of Standards and Science

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Complex oxide systems have attracted considerable attention because of their fascinating properties, including the magnetic ordering at the conducting interface between two band insulators, such as LaAlO3 and SrTiO3. However, the manipulation of the spin degree of freedom at the LaAlO3/SrTiO3 heterointerface has remained elusive. Here, we have fabricated hybrid magnetic tunnel junctions consisting of Co and LaAlO3/SrTiO3 ferromagnets with the insertion of a Ti layer in between, which clearly exhibit magnetic switching and the tunnelling magnetoresistance effect below 10 K. The magnitude and sign of the tunnelling magnetoresistance are strongly dependent on the direction of the rotational magnetic field parallel to the LaAlO3/SrTiO3 plane, which is attributed to a strong Rashba-type spin-orbit coupling in the LaAlO3/SrTiO3 heterostructure. Our study provides a further support for the existence of the macroscopic ferromagnetism at LaAlO3/SrTiO3 heterointerfaces and opens a novel route to realize interfacial spintronics devices.

Date: 2015
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DOI: 10.1038/ncomms9035

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