Extraordinary anisotropic magnetoresistance in CaMnO3/CaIrO3 heterostructures

Vagadia, Megha; Sardar, Suman; Tank, Tejas; Das, Sarmistha; Gunn, Brandon; Pandey, Parul; Hübner, R.; Rodolakis, Fanny; Fabbris, Gilberto; Choi, Yongseong; Haskel, Daniel; Frano, Alex; Rana, D. S.

doi:10.1103/physrevb.105.l020402

Title: Extraordinary anisotropic magnetoresistance in CaMnO₃/CaIrO₃ heterostructures

Journal Article · 02 January 2022 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.105.l020402 · OSTI ID:1840748

Vagadia, Megha ^[1]; Sardar, Suman ^[1]; Tank, Tejas ^[1]; Das, Sarmistha ^[2]; Gunn, Brandon ^[2];

^[3]; Hübner, R. ^[3];

^[4];

^[4]; Frano, Alex ^[2];

^[1]

Indian Inst. of Science Education and Research Bhopal, Madhya Pradesh (India)
Univ. of California, San Diego, CA (United States)
Helmholtz-Zentrum Dresden-Rossendorf (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)

The realization of four-fold anisotropic magnetoresistance (AMR) in novel 3d-5d heterostructures has boosted major efforts in antiferromagnetic spintronics. However, despite the potential of incorporating strong spin-orbit coupling, only small AMR signals have been detected thus far, prompting a search for new mechanisms to enhance the signal. In this study on CaMnO₃/CaIrO₃ heterostructures, we report a unique dual-four-fold symmetric 70% AMR; a signal two orders of magnitude larger than previously observed in similar systems. We find that one order is enhanced by tuning a large biaxial anisotropy through octahedral tilts of similar sense in the constituent layers, while the second order is triggered by a spin-flop transition in a nearly Mott-type phase. Dynamics between these two phenomena as evidenced by the step-like AMR and a superimposed biaxial-anisotropy-induced AMR capture a subtle interplay of pseudospin coupling with the lattice and external magnetic field. Furthermore, our study shows that a combination of charge-transfer, interlayer coupling, and a spin-flop transition can yield a giant AMR relevant for sensing and antiferromagnetic memory applications.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357; SC0019273

OSTI ID:: 1840748

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Extraordinary anisotropic magnetoresistance in CaMnO₃/CaIrO₃ heterostructures