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

doi:10.1038/ncomms9035

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

20 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 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.

Original language	English
Article number	8035
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms9035
Publication status	Published - 2015 Aug 13

ASJC Scopus subject areas

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

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title = "Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces",

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.",

author = "Ngo, {Thach D.N.} and Chang, {Jung Won} and Kyujoon Lee and Seungju Han and Lee, {Joon Sung} and Kim, {Young Heon} and Jung, {Myung Hwa} and Doh, {Yong Joo} and Choi, {Mahn Soo} and Jonghyun Song and Jinhee Kim",

year = "2015",

month = aug,

day = "13",

doi = "10.1038/ncomms9035",

language = "English",

volume = "6",

journal = "Nature Communications",

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T1 - Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces

AU - Ngo, Thach D.N.

AU - Chang, Jung Won

AU - Lee, Kyujoon

AU - Han, Seungju

AU - Lee, Joon Sung

AU - Kim, Young Heon

AU - Jung, Myung Hwa

AU - Doh, Yong Joo

AU - Choi, Mahn Soo

AU - Song, Jonghyun

AU - Kim, Jinhee

PY - 2015/8/13

Y1 - 2015/8/13

N2 - 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.

AB - 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.

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DO - 10.1038/ncomms9035

M3 - Article

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VL - 6

JO - Nature Communications

JF - Nature Communications

M1 - 8035

ER -

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

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ASJC Scopus subject areas

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