Spatially Resolved Large Magnetization in Ultrathin BiFeO3

Guo, Er-Jia; Petrie, Jonathan R.; Roldan, Manuel A.; Li, Qian; Desautels, Ryan D.; Charlton, Timothy; Herklotz, Andreas; Nichols, John; van Lierop, Johan; Freeland, John W.; Kalinin, Sergei V.; Lee, Ho Nyung; Fitzsimmons, Michael R.

doi:10.1002/adma.201700790

Title: Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

Journal Article · Mon Jun 19 00:00:00 EDT 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201700790· OSTI ID:1366389

^[1]; Petrie, Jonathan R. ^[2]; Roldan, Manuel A. ^[3]; Li, Qian ^[4]; Desautels, Ryan D. ^[1]; Charlton, Timothy ^[1]; Herklotz, Andreas ^[2]; Nichols, John ^[2]; van Lierop, Johan ^[5]; Freeland, John W. ^[6]; Kalinin, Sergei V. ^[4]; Lee, Ho Nyung ^[2]; Fitzsimmons, Michael R. ^[7]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Imaging and Characterization Core Lab.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS), Inst. for Functional Imaging of Materials
Univ. of Manitoba, Winnipeg (Canada). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

Complex interactions across the interface in heterostructures can generate novel functionalities not present in the constituent materials. Here, we create a unique ferromagnetic ground state out of normally antiferromagnetic BiFeO₃ (BFO) by interleaving it with layers of ferromagnetic La_0.7Sr_0.3MnO₃. Intriguingly, we found that the magnetization of BFO was aligned opposite to that of the manganite layers. Based on polarized neutron reflectometry (PNR) depth profiling of custom-designed layers, we obtained a net magnetization in the BFO layers of 275 kA/m (~1.83 B/Fe) at 10 K, which is two times larger than the previously reported values. Additionally, ferromagnetic order in the BFO persists up to 200 K, which is much higher than previously seen in BFO heterostructures. Our unprecedented understanding of the evolution of magnetism and functional coupling across the interface between antiferromagnetic and ferromagnetic layers provides a blueprint towards advanced spintronic devices.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1366389

Alternate ID(s):: OSTI ID: 1376743

Journal Information:: Advanced Materials, Vol. 29, Issue 32; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Title: Spatially Resolved Large Magnetization in Ultrathin BiFeO₃