Electric-field control of anomalous and topological Hall effects in oxide bilayer thin films

Yuki Ohuchi, Jobu Matsuno (), Naoki Ogawa, Yusuke Kozuka, Masaki Uchida, Yoshinori Tokura and Masashi Kawasaki
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Yuki Ohuchi: University of Tokyo
Jobu Matsuno: RIKEN Center for Emergent Matter Science (CEMS)
Naoki Ogawa: RIKEN Center for Emergent Matter Science (CEMS)
Yusuke Kozuka: University of Tokyo
Masaki Uchida: University of Tokyo
Yoshinori Tokura: University of Tokyo
Masashi Kawasaki: University of Tokyo

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract One of the key goals in spintronics is to tame the spin-orbit coupling (SOC) that links spin and motion of electrons, giving rise to intriguing magneto-transport properties in itinerant magnets. Prominent examples of such SOC-based phenomena are the anomalous and topological Hall effects. However, controlling them with electric fields has remained unachieved since an electric field tends to be screened in itinerant magnets. Here we demonstrate that both anomalous and topological Hall effects can be modulated by electric fields in oxide heterostructures consisting of ferromagnetic SrRuO3 and nonmagnetic SrIrO3. We observe a clear electric field effect only when SrIrO3 is inserted between SrRuO3 and a gate dielectric. Our results establish that strong SOC of nonmagnetic materials such as SrIrO3 is essential in electrical tuning of these Hall effects and possibly other SOC-related phenomena.

Date: 2018
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DOI: 10.1038/s41467-017-02629-3

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