Abnormal enhancement of ferromagnetism for LaMnO3+δ thin films with decreasing oxygen pressure

Zhang, A. M.; Zhang, W. C.; Wu, Xiaoshan; Lin, J. G.

doi:10.1063/1.4978657

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…A clear shift in the T C as well as the magnitude of the magnetic moment in both the samples are consistent with earlier reports, ascertaining that the disproportion of Mn 3+ and Mn 4+ drives LaMnO 3 layer to different magnetic order [22,23]. The oxygen gas atmosphere during the deposition allows oxygen to be absorbed into the lattice, thereby enhancing the formation of Mn 4+ ions promoting double exchange mediated ferromagnetic ordering in epitaxial HP-LMO thin films [20,22,23]. When the pO 2 during LaMnO 3 deposition decreases, this enhances formation of increased Mn 3+ which has smaller magnetic moment compared to Mn 4+ the LaMnO 3 layer evolves to an antiferromagnetic ground state.…”

Section: Resultssupporting

confidence: 92%

“…1b) in the magnetic measurements. A clear shift in the T C as well as the magnitude of the magnetic moment in both the samples are consistent with earlier reports, ascertaining that the disproportion of Mn 3+ and Mn 4+ drives LaMnO 3 layer to different magnetic order [22,23]. The oxygen gas atmosphere during the deposition allows oxygen to be absorbed into the lattice, thereby enhancing the formation of Mn 4+ ions promoting double exchange mediated ferromagnetic ordering in epitaxial HP-LMO thin films [20,22,23].…”

Section: Resultssupporting

confidence: 91%

“…Our earlier studies demonstrate the origin of ferromagnetism in LaMnO 3 /SrTiO 3 heterostructures by mapping the magnetic domains which show long-range ferromagnetic ordering arising from electron doping at the LaMnO 3 /SrTiO 3 due to polar catastrophe [19]. LaMnO 3 thin films grown under different deposition oxygen partial pressures (pO 2 ) have also been systematically studied by different groups with a variety of experimental techniques arXiv:2004.00800v1 [cond-mat.str-el] 2 Apr 2020 such as X-ray Absorption Spectroscopy (XAS), X-ray Magnetic Circular Dichroism (XMCD) and Transmission Electron Microscopy-Electron Energy Loss Spectroscopy (TEM-EELS) [18][19][20][21][22][23]. Roqueta et al reported tunability of strain-controlled ferromagnetism in LaMnO 3 during growth by varying the background pO 2 that resulted in a rich magnetic phase diagram.…”

Section: Introductionmentioning

confidence: 99%

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Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

et al. 2020

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Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a novel platform for engineering the magnetism and spin-orbit coupling at LaMnO3/SrIrO3 (3d -5d oxide) interfaces by tuning the LaMnO3 growth conditions which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report on a tunable and enhanced interface-induced Rashba spin-orbit coupling and Elliot-Yafet spin relaxation mechanism in LaMnO3/SrIrO3 bilayer with change in the underlying magnetic order of LaMnO3. We also observed enhanced spin-orbit coupling strength in LaMnO3/SrIrO3 compared to previously reported SrIrO3 layers. The X-Ray spectroscopy measurement reveals the quantitative valence of Mn and their impact on charge transfer. Further, we performed angle-dependent magnetoresistance measurements, which show signatures of magnetic proximity effect in SrIrO3 while reflecting the magnetic order of LaMnO3. Our work thus demonstrates a new route to engineer the interface induced Rashba spin-orbit coupling and magnetic proximity effect in 3d -5d oxide interfaces which makes SrIrO3 an ideal candidate for spintronics applications.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

et al. 2020

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“…For the film deposited at 1 Pa, weak ferromagnetism was ascribed to the much decreased concentration of O v and the much lower magnetic moment than that in films with lower P O2 . At moderate P O2 , the concentration of O v in the film maintained a good balance with that of Co 2+ ions, forming the bound magnetic polaron [34] and improving the magnetic moment [35]. So good ferromagnetism was observed in the film grown at moderate P O2 of 0.1 Pa. At low P O2 , though the concentration of Co-O v complexes was high due to the high concentration of O v , the ferromagnetism was weakened by the large film-substrate stains in these films.…”

Section: Resultsmentioning

confidence: 99%

Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn_0.5Co_0.5O₃ thin films

Gao

2018

Materials Research Letters

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Room-temperature ferromagnetism was obtained in SrSn 0.5 Co 0.5 O 3 (SSCO) epitaxial film on SrTiO 3 substrate by pulsed laser deposition, and the effects of oxygen pressure (P O2 ) on the microstructure, optical and magnetic properties were examined. An interesting hybrid epitaxial film embedded with polycrystalline SSCO and SrCoO x nanoparticles was observed. The increase of P O2 relaxed the film/substrate compressive strain, promoted the growth of crystallites and reduced the optical band gap (from 2.43 to 1.68 eV). The SSCO film deposited at 0.1 Pa exhibited good ferromagnetism at 100-300 K, while the ferromagnetism in the film with higher and lower oxygen pressure (1 Pa and 10 −4 Pa) was weak. IMPACT STATEMENTRoom-temperature ferromagnetism and tunable optical band gap (2.34-1.68 eV) were demonstrated in Co-doped SrSnO 3 thin film grown on SrTiO 3 single-crystal substrate by pulsed laser deposition with varying oxygen pressure.

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“…There are also many ways to control the magnetism for perovskite materials such as LaMnO 3 (LMO). The magnetization of an LMO thin film grown on SrTiO 3 (STO) (Kim & Christen, 2010;Roqueta et al, 2015) or LaAlO 3 (Zhang et al, 2017) substrates can be directly controlled by changing the oxygen partial pressure. Two phase transitions occur in the LMO thin film (Hou et al, 2014), namely the transition from the A-type antiferromagnetic (A-AFM) phase to the insulating ferromagnetic phase and then to the metallic ferromagnetic phase.…”

Section: Introductionmentioning

confidence: 99%

Robust manipulation of magnetism in LaAO₃/BaTiO₃ (A = Fe, Mn and Cr) superstructures by ferroelectric polarization

Chen

Zhang

Cheng

et al. 2019

Int Union Crystallogr J

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Robust control of magnetism is both fundamentally and practically meaningful and highly desirable, although it remains a big challenge. In this work, perovskite oxide superstructures LaFeO3/BaTiO3 (LFO/BTO), LaMnO3/BaTiO3 (LMO/BTO) and LaCrO3/BaTiO3 (LCO/BTO) (001) are designed to facilitate tuning of magnetism by the electric field from ferroelectric polarization, and are systemically investigated via first-principles calculations. The results show that the magnetic ordering, conductivity and exchange interactions can be controlled simultaneously or individually by the reorientation of the ferroelectric polarization of BTO in these designed superstructures. Self-consistent calculations within the generalized gradient approximation plus on-site Coulomb correction did not produce distinct rotations of oxygen octahedra, but there were obvious changes in bond length between oxygen and the cations. These changes cause tilting of the oxygen octahedra and lead to spin, orbital and bond reconstruction at the interface, which is the structural basis responsible for the manipulation. With the G-type antiferromagnetic (G-AFM) ordering unchanged for both ±P cases, a metal–insulator transition can be observed in the LFO/BTO superstructure, which is controlled by the LFO thin film. The LMO/BTO system has A-type antiferromagnetic (A-AFM) ordering with metallic behavior in the +P case, while it shifts to a half-metallic ferromagnetic ordering when the direction of the polarization is switched. LCO/BTO exhibits C-type antiferromagnetic (C-AFM) and G-AFM orders in the +P and −P cases, respectively. The three purpose-designed superstructures with robust intrinsic magnetoelectric coupling are a particularly interesting model system that can provide guidance for the development of this field for future applications.

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Abnormal enhancement of ferromagnetism for LaMnO3+δ thin films with decreasing oxygen pressure

Cited by 6 publications

References 29 publications

Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn_0.5Co_0.5O₃ thin films

Robust manipulation of magnetism in LaAO₃/BaTiO₃ (A = Fe, Mn and Cr) superstructures by ferroelectric polarization

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Abnormal enhancement of ferromagnetism for LaMnO3+δ thin films with decreasing oxygen pressure

Cited by 6 publications

References 29 publications

Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn0.5Co0.5O3 thin films

Robust manipulation of magnetism in LaAO3/BaTiO3 (A = Fe, Mn and Cr) superstructures by ferroelectric polarization

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Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn_0.5Co_0.5O₃ thin films

Robust manipulation of magnetism in LaAO₃/BaTiO₃ (A = Fe, Mn and Cr) superstructures by ferroelectric polarization