Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces
| Autor: | Kyujoon Lee, Young Heon Kim, Jinhee Kim, Seungju Han, Joon Sung Lee, Yong-Joo Doh, Mahn Soo Choi, Jung Won Chang, Myung-Hwa Jung, Thach D. N. Ngo, Jonghyun Song |
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| Rok vydání: | 2014 |
| Předmět: |
Multidisciplinary
Materials science Condensed matter physics Spintronics Magnetoresistance Oxide General Physics and Astronomy Nanotechnology Heterojunction General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect General Biochemistry Genetics and Molecular Biology Article Magnetic field chemistry.chemical_compound Condensed Matter::Materials Science Ferromagnetism chemistry Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Spin (physics) Quantum tunnelling |
| Zdroj: | Nature Communications NATURE COMMUNICATIONS(6) |
| ISSN: | 2041-1723 |
| Popis: | 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. The interface between two insulating oxides can play host to magnetic ordering. Here, the authors manipulate the spin transport in a hybrid magnetic tunnel junction comprising two ferromagnets: one a cobalt layer and the other the interface between lanthanum aluminate and strontium titanate. |
| Databáze: | OpenAIRE |
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