Interface-driven magnetic anisotropy in relaxed La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures on MgO

Koohfar, Sanaz; Ozbek, Yasemin; Bland, Hayden; Zhang, Zhan; Kumah, Divine P.

doi:10.1063/5.0033236

Title: Interface-driven magnetic anisotropy in relaxed La_0.7Sr_0.3CrO₃/La_0.7Sr_0.3MnO₃ heterostructures on MgO

Journal Article · Sun Feb 07 00:00:00 EST 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0033236· OSTI ID:1770291

Koohfar, Sanaz ^[1];

^[1]; Bland, Hayden ^[1]; Zhang, Zhan ^[2];

^[1]

North Carolina State Univ., Raleigh, NC (United States)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)

We investigate the structural and magnetic properties of La_0.7Sr_0.3CrO₃/La_0.7Sr_0.3MnO₃ (LSMO) heterostructures grown on (001)-oriented MgO by molecular beam epitaxy. Due to the large film-substrate lattice mismatch, strain relaxation is found to occur within the first 2–3 unit cells (uc) of the film as evidenced by reflection high energy electron diffraction and high-resolution synchrotron x-ray reciprocal space mapping. Furthermore, we find that the presence of the LSCO spacer and capping layers leads to ferromagnetism in ultra-thin LSMO layers with thicknesses of the order of 2 uc with the magnetic easy axis oriented in the film plane. Net magnetic moments of 1.4 and 2.4 μ_B/Mn are measured for (2 uc LSCO/2 uc LSMO) and (2 uc LSCO/4 uc LSMO) superlattices, respectively, by superconducting quantum interference device magnetometry. The effective magnetic anisotropy of the relaxed (2 uc LSCO/4 uc LSMO) heterostructure is found to be an order of magnitude higher than bulk LSMO highlighting the critical role of interfacial interactions in tuning magnetic anisotropy at complex oxide interfaces.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357; DMR-1751455; ECCS-1542015; DMR-1726294; AC02-05CH11231; AC02- 06CH11357

OSTI ID:: 1770291

Alternate ID(s):: OSTI ID: 1763835

Journal Information:: Journal of Applied Physics, Vol. 129, Issue 5; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Interface-driven magnetic anisotropy in relaxed La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures on MgO

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Title: Interface-driven magnetic anisotropy in relaxed La_0.7Sr_0.3CrO₃/La_0.7Sr_0.3MnO₃ heterostructures on MgO