Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO3-confined bilayer heterostructure of ultrathin SrRuO3 and SrIrO3

Prahald Siwakoti; Dongliang Gong; Shashi Pandey; Jiangxu Li; Louis Primeau; Ujjal Lamichhane; Babu Ram Sankhi; Yan Xin; Evguenia Karapetrova; Joerg Strempfer; Yongseong Choi; Yang Zhang; Derek Meyers; Jian Liu

doi:10.1016/j.apmt.2025.102960

Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO₃-confined bilayer heterostructure of ultrathin SrRuO₃ and SrIrO₃

Prahald Siwakoti
, Dongliang Gong
, Shashi Pandey
, Jiangxu Li
, Louis Primeau
, Ujjal Lamichhane
, Babu Ram Sankhi
, Yan Xin
, Evguenia Karapetrova
, Joerg Strempfer
, Yongseong Choi
, Yang Zhang
, Derek Meyers
, Jian Liu

Materials Theory

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

Abstract

Ferromagnetism is an essential ingredient for anomalous Hall effect. SrRuO₃ is a representative ferromagnetic oxide that exhibits anomalous Hall effect even down to the monolayer confinement limit. Paramagnetic metal SrIrO₃, on the other hand, becomes an antiferromagnetic insulator when confined to a monolayer. Here we show that, by forming a confined bilayer structure of SrRuO₃ and SrIrO₃ monolayers with SrTiO₃ spacers, the anomalous Hall effect is significantly enhanced while the ferromagnetism as well as the perpendicular magnetic anisotropy are suppressed. These effects originate from interfacial Ru–Ir hybridization that modifies the electronic structure in the vicinity of the Fermi level. Our work demonstrates that confined bilayer heterostructure is an useful design for exploring the synergistic combination of interfacial coupling and quantum confinement of complex oxides.

Original language	English
Article number	102960
Journal	Applied Materials Today
Volume	47
DOIs	https://doi.org/10.1016/j.apmt.2025.102960
State	Published - Dec 2025

Funding

Materials synthesis was supported by the Office of Naval Research (Grant No. N00014–20–1–2809 ). Synchrotron characterizations were supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Award No. DE-SC0022311 . Transport measurements were supported by the National Science Foundation under Grant No. DMR-1848269 . STEM work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR1644779 , DMR-2128556 and the State of Florida. S.P. acknowledges the State of Tennessee and Tennessee Higher Education Commission (THEC) through their support of the Center for Materials Processing. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. DOE, OS by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02–06CH11357 . J. Li and L. P. were supported by the National Science Foundation Materials Research Science and Engineering Center program through the UT Knoxville Center for Advanced Materials and Manufacturing (DMR-2309083).

Keywords

Anomalous Hall effect
Magnetic anisotropy
Monolayer confinement

Access to Document

10.1016/j.apmt.2025.102960

Cite this

Siwakoti, P., Gong, D., Pandey, S., Li, J., Primeau, L., Lamichhane, U., Sankhi, B. R., Xin, Y., Karapetrova, E., Strempfer, J., Choi, Y., Zhang, Y., Meyers, D., & Liu, J. (2025). Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO₃-confined bilayer heterostructure of ultrathin SrRuO₃ and SrIrO₃. Applied Materials Today, 47, Article 102960. https://doi.org/10.1016/j.apmt.2025.102960

@article{11a0d0892aba40b6b5b5c5c6dc76025d,

title = "Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO3-confined bilayer heterostructure of ultrathin SrRuO3 and SrIrO3",

abstract = "Ferromagnetism is an essential ingredient for anomalous Hall effect. SrRuO3 is a representative ferromagnetic oxide that exhibits anomalous Hall effect even down to the monolayer confinement limit. Paramagnetic metal SrIrO3, on the other hand, becomes an antiferromagnetic insulator when confined to a monolayer. Here we show that, by forming a confined bilayer structure of SrRuO3 and SrIrO3 monolayers with SrTiO3 spacers, the anomalous Hall effect is significantly enhanced while the ferromagnetism as well as the perpendicular magnetic anisotropy are suppressed. These effects originate from interfacial Ru–Ir hybridization that modifies the electronic structure in the vicinity of the Fermi level. Our work demonstrates that confined bilayer heterostructure is an useful design for exploring the synergistic combination of interfacial coupling and quantum confinement of complex oxides.",

keywords = "Anomalous Hall effect, Magnetic anisotropy, Monolayer confinement",

author = "Prahald Siwakoti and Dongliang Gong and Shashi Pandey and Jiangxu Li and Louis Primeau and Ujjal Lamichhane and Sankhi, \{Babu Ram\} and Yan Xin and Evguenia Karapetrova and Joerg Strempfer and Yongseong Choi and Yang Zhang and Derek Meyers and Jian Liu",

note = "Publisher Copyright: {\textcopyright} 2025 .",

year = "2025",

month = dec,

doi = "10.1016/j.apmt.2025.102960",

language = "English",

volume = "47",

journal = "Applied Materials Today",

issn = "2352-9407",

publisher = "Elsevier",

}

Siwakoti, P, Gong, D, Pandey, S, Li, J, Primeau, L, Lamichhane, U, Sankhi, BR, Xin, Y, Karapetrova, E, Strempfer, J, Choi, Y, Zhang, Y, Meyers, D & Liu, J 2025, 'Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO₃-confined bilayer heterostructure of ultrathin SrRuO₃ and SrIrO₃', Applied Materials Today, vol. 47, 102960. https://doi.org/10.1016/j.apmt.2025.102960

TY - JOUR

T1 - Enhancing anomalous Hall effect with suppressed ferromagnetism in the SrTiO3-confined bilayer heterostructure of ultrathin SrRuO3 and SrIrO3

AU - Siwakoti, Prahald

AU - Gong, Dongliang

AU - Pandey, Shashi

AU - Li, Jiangxu

AU - Primeau, Louis

AU - Lamichhane, Ujjal

AU - Sankhi, Babu Ram

AU - Xin, Yan

AU - Karapetrova, Evguenia

AU - Strempfer, Joerg

AU - Choi, Yongseong

AU - Zhang, Yang

AU - Meyers, Derek

AU - Liu, Jian

PY - 2025/12

Y1 - 2025/12

N2 - Ferromagnetism is an essential ingredient for anomalous Hall effect. SrRuO3 is a representative ferromagnetic oxide that exhibits anomalous Hall effect even down to the monolayer confinement limit. Paramagnetic metal SrIrO3, on the other hand, becomes an antiferromagnetic insulator when confined to a monolayer. Here we show that, by forming a confined bilayer structure of SrRuO3 and SrIrO3 monolayers with SrTiO3 spacers, the anomalous Hall effect is significantly enhanced while the ferromagnetism as well as the perpendicular magnetic anisotropy are suppressed. These effects originate from interfacial Ru–Ir hybridization that modifies the electronic structure in the vicinity of the Fermi level. Our work demonstrates that confined bilayer heterostructure is an useful design for exploring the synergistic combination of interfacial coupling and quantum confinement of complex oxides.

AB - Ferromagnetism is an essential ingredient for anomalous Hall effect. SrRuO3 is a representative ferromagnetic oxide that exhibits anomalous Hall effect even down to the monolayer confinement limit. Paramagnetic metal SrIrO3, on the other hand, becomes an antiferromagnetic insulator when confined to a monolayer. Here we show that, by forming a confined bilayer structure of SrRuO3 and SrIrO3 monolayers with SrTiO3 spacers, the anomalous Hall effect is significantly enhanced while the ferromagnetism as well as the perpendicular magnetic anisotropy are suppressed. These effects originate from interfacial Ru–Ir hybridization that modifies the electronic structure in the vicinity of the Fermi level. Our work demonstrates that confined bilayer heterostructure is an useful design for exploring the synergistic combination of interfacial coupling and quantum confinement of complex oxides.

KW - Anomalous Hall effect

KW - Magnetic anisotropy

KW - Monolayer confinement

UR - https://www.scopus.com/pages/publications/105021221329

U2 - 10.1016/j.apmt.2025.102960

DO - 10.1016/j.apmt.2025.102960

M3 - Article

AN - SCOPUS:105021221329

SN - 2352-9407

VL - 47

JO - Applied Materials Today

JF - Applied Materials Today

M1 - 102960

ER -