Tuning In-Plane Magnetic Anisotropy and Interfacial Exchange Coupling in Epitaxial La2/3Sr1/3CoO3/La2/3Sr1/3MnO3 Heterostructures

Feng, Mingzhen; Ahlm, Nolan; Sasaki, Dayne Y.; Chiu, I-Ting; N’Diaye, Alpha T.; Shafer, Padraic; Klewe, Christoph; Mehta, Apurva; Takamura, Yayoi

doi:10.1021/acsami.3c10376

Tuning In-Plane Magnetic Anisotropy and Interfacial Exchange Coupling in Epitaxial La_2/3Sr_1/3CoO₃/La_2/3Sr_1/3MnO₃ Heterostructures

Journal Article · Wed Nov 01 00:00:00 EDT 2023 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.3c10376· OSTI ID:2280865

^[1]; Ahlm, Nolan ^[2]; ^[2]; Chiu, I-Ting ^[2]; N’Diaye, Alpha T. ^[3]; ^[3]; Klewe, Christoph ^[3]; ^[4]; ^[2]

Univ. of California, Davis, CA (United States); SLAC
Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Controlling the in-plane magnetocrystalline anisotropy and interfacial exchange coupling between ferromagnetic (FM) layers plays a key role in next-generation spintronic and magnetic memory devices. In this work, we explored the effect of tuning the magnetocrystalline anisotropy of La_2/3Sr_1/3CoO₃ (LSCO) and La_2/3Sr_1/3MnO₃ (LSMO) layers and the corresponding effect on interfacial exchange coupling by adjusting the thickness of the LSCO layer (t_LSCO). The epitaxial LSCO/LSMO bilayers were grown on (110)_o-oriented NdGaO₃ (NGO) substrates with a fixed LSMO (top layer) thickness of 6 nm and LSCO (bottom layer) thicknesses varying from 1 to 10 nm. Despite the small difference (~0.2%) in lattice mismatch between the two in-plane directions, [001]_o and [11̅0]_o, a pronounced in-plane magnetic anisotropy was observed. Soft X-ray magnetic circular dichroism hysteresis loops revealed that for t_LSCO ≤ 4 nm, the easy axes for both LSCO and LSMO layers were along the [001]_o direction, and the LSCO layer was characterized by magnetically active Co²⁺ ions that strongly coupled to the LSMO layer. No exchange bias effect was observed in the hysteresis loops. In contrast, along the [11̅0]_o direction, the LSCO and LSMO layers displayed a small difference in their coercivity values, and a small exchange bias shift was observed. As t_LSCO increased above 4 nm, the easy axis for the LSCO layer remained along the [100]_o direction, but it gradually rotated to the [11̅0]_o direction for the LSMO layer, resulting in a large negative exchange bias shift. Therefore, we provide a way to control the magnetocrystalline anisotropy and exchange bias by tuning the interfacial exchange coupling between the two FM layers.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

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

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 2280865

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 45 Vol. 15; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Tuning In-Plane Magnetic Anisotropy and Interfacial Exchange Coupling in Epitaxial La2/3Sr1/3CoO3/La2/3Sr1/3MnO3 Heterostructures

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Tuning In-Plane Magnetic Anisotropy and Interfacial Exchange Coupling in Epitaxial La_2/3Sr_1/3CoO₃/La_2/3Sr_1/3MnO₃ Heterostructures