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, Jinhee Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 LaAlO<inf>3</inf> and SrTiO<inf>3</inf>. However, the manipulation of the spin degree of freedom at the LaAlO<inf>3</inf>/SrTiO<inf>3</inf> heterointerface has remained elusive. Here, we have fabricated hybrid magnetic tunnel junctions consisting of Co and LaAlO<inf>3</inf>/SrTiO<inf>3</inf> 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 LaAlO<inf>3</inf>/SrTiO<inf>3</inf> plane, which is attributed to a strong Rashba-type spin-orbit coupling in the LaAlO<inf>3</inf>/SrTiO<inf>3</inf> heterostructure. Our study provides a further support for the existence of the macroscopic ferromagnetism at LaAlO<inf>3</inf>/SrTiO<inf>3</inf> heterointerfaces and opens a novel route to realize interfacial spintronics devices.

Original languageEnglish
Article number8035
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 2015 Aug 13

Fingerprint

Tunnel junctions
Ferromagnetism
tunnel junctions
Oxides
ferromagnetism
polarity
magnetic switching
oxides
Tunnelling magnetoresistance
manipulators
insertion
degrees of freedom
routes
insulators
orbits
conduction
magnetic fields
Magnetoelectronics
Magnets
Orbit

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Ngo, T. D. N., Chang, J. W., Lee, K., Han, S., Lee, J. S., Kim, Y. H., ... Kim, J. (2015). Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces. Nature Communications, 6, [8035]. https://doi.org/10.1038/ncomms9035

Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces. / Ngo, Thach D N; Chang, Jung Won; Lee, Kyujoon; Han, Seungju; Lee, Joon Sung; Kim, Young Heon; Jung, Myung Hwa; Doh, Yong Joo; Choi, Mahn-Soo; Song, Jonghyun; Kim, Jinhee.

In: Nature Communications, Vol. 6, 8035, 13.08.2015.

Research output: Contribution to journalArticle

Ngo, TDN, Chang, JW, Lee, K, Han, S, Lee, JS, Kim, YH, Jung, MH, Doh, YJ, Choi, M-S, Song, J & Kim, J 2015, 'Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces', Nature Communications, vol. 6, 8035. https://doi.org/10.1038/ncomms9035
Ngo, Thach D N ; Chang, Jung Won ; Lee, Kyujoon ; Han, Seungju ; Lee, Joon Sung ; Kim, Young Heon ; Jung, Myung Hwa ; Doh, Yong Joo ; Choi, Mahn-Soo ; Song, Jonghyun ; Kim, Jinhee. / Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces. In: Nature Communications. 2015 ; Vol. 6.
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