Journal Article

FZJ-2021-01282

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tailoring the anomalous Hall effect of SrRuO 3 thin films by strain: A first principles study

Samanta, K. (Corresponding author)FZJ* ; Ležaić, M.FZJ* ; Blügel, S.FZJ* ; Mokrousov, Y.FZJ*

2021
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/27292  doi:10.1063/5.0043742

Abstract: Motivated by the recently observed unconventional Hall effect in ultrathin films of ferromagnetic SrRuO3 (SRO), we investigate the effect of strain-induced oxygen octahedral distortion in the electronic structure and anomalous Hall response of the SRO ultrathin films by virtue of density functional theory calculations. Our findings reveal that the ferromagnetic SRO films grown on SrTiO3 (in-plane strain of −0.47%) have an orthorhombic (both tilting and rotation) distorted structure, and with an increasing amount of substrate induced compressive strain the octahedral tilting angle is found to be suppressed gradually, with SRO films grown on NdGaO3 (in-plane strain of −1.7%) stabilized in the tetragonal distorted structure (with zero tilting). Our Berry curvature calculations predict a positive value of the anomalous Hall conductivity of +76 S/cm at −1.7% strain, whereas it is found to be negative (−156 S/cm) at −0.47% strain. We attribute the found behavior of the anomalous Hall effect to the nodal point dynamics in the electronic structure arising in response to tailoring the oxygen octahedral distortion driven by the substrate induced strain. We also calculate strain-mediated anomalous Hall conductivity as a function of reduced magnetization obtained by scaling down the magnitude of the exchange field inside Ru atoms finding good qualitative agreement with experimental observations, which indicates a strong impact of longitudinal thermal fluctuations of Ru spin moments on the anomalous Hall effect in this system.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 521 - Quantum Materials (POF4-521) (POF4-521)
2. Interface Stabilized Skyrmions in oxide structures for skyrmionics from first principles (jpgi11_20191101) (jpgi11_20191101)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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