Motivated by the recently observed topological Hall effect in ultra-thin films of SrRuO (SRO) grown on the SrTiO [001] substrate, we investigate the magnetic ground state and anomalous Hall response of the SRO ultra-thin films by virtue of spin density functional theory (DFT). Our findings reveal that in the monolayer limit of an SRO film, a large energy splitting of Ru- states stabilizes an anti-ferromagnetic (AFM) insulating magnetic ground state. For the AFM ground state, our Berry curvature calculations predict a large anomalous Hall response upon doping. From the systematic symmetry analysis, we uncover that the large anomalous Hall effect arises due to a combination of broken time-reversal and crystal symmetries caused by the arrangement of non-magnetic atoms (Sr and O) in the SRO monolayer. We identify the emergent Hall effect as a clear manifestation of the so-called crystal Hall effect in terminology of Šmejkal et al., Crystal Hall effect in collinear antiferromagnets (2019), and demonstrate that it persists at finite frequencies, which is the manifestation of the crystal magneto-optical effect. Moreover, we find a colossal dependence of the anomalous Hall effect on the degree of crystal symmetry breaking also in ferromagnetic SRO films, which all together points to an alternative explanation of the emergence of the topological Hall effect observed in this type of systems.
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7 June 2020
Research Article|
June 05 2020
Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3
Special Collection:
Antiferromagnetic Spintronics
Kartik Samanta
;
Kartik Samanta
a)
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
a)Author to whom correspondence should be addressed: [email protected]
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Marjana Ležaić;
Marjana Ležaić
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
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Maximilian Merte
;
Maximilian Merte
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
2
Institute of Physics, Johannes Gutenberg-University Mainz
, 55128 Mainz, Germany
3
Department of Physics, RWTH Aachen University
, 52056 Aachen, Germany
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Frank Freimuth
;
Frank Freimuth
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
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Stefan Blügel
;
Stefan Blügel
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
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Yuriy Mokrousov
Yuriy Mokrousov
1
Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
, 52425 Jülich, Germany
2
Institute of Physics, Johannes Gutenberg-University Mainz
, 55128 Mainz, Germany
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the special topic on Antiferromagnetic Spintronics.
J. Appl. Phys. 127, 213904 (2020)
Article history
Received:
February 18 2020
Accepted:
May 24 2020
Citation
Kartik Samanta, Marjana Ležaić, Maximilian Merte, Frank Freimuth, Stefan Blügel, Yuriy Mokrousov; Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3. J. Appl. Phys. 7 June 2020; 127 (21): 213904. https://doi.org/10.1063/5.0005017
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