Room temperature magnetoresistance properties in self-assembled epitaxial La0.7Sr0.3MnO3:NiO nanocomposite thin films

Wu, Ying; Wang, Z. J.; Ning, Xiaojuan; Wang, Q.; Liu, W.; Zhang, Z. D.

doi:10.1080/21663831.2018.1482838

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…The LSMO-NiO interfaces were found to modulate the interactions between lattice, spin and chemical composition, which enables exchange-biased magnetoresistance [ 29 ] and unusual electric conductivity [ 30 ]. Similar LSMO-NiO VAN structures have also been the subject of other studies, which demonstrate perpendicular exchange bias [ 35 ] and tunable magnetoresistance [ 36 ].…”

Section: Introductionmentioning

confidence: 73%

Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces

Zhang

Cheng

et al. 2021

Nano-Micro Lett.

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Engineering oxygen vacancy formation and distribution is a powerful route for controlling the oxygen sublattice evolution that affects diverse functional behavior. The controlling of the oxygen vacancy formation process is particularly important for inducing topotactic phase transitions that occur by transformation of the oxygen sublattice. Here we demonstrate an epitaxial nanocomposite approach for exploring the spatial control of topotactic phase transition from a pristine perovskite phase to an oxygen vacancy-ordered brownmillerite (BM) phase in a model oxide La0.7Sr0.3MnO3 (LSMO). Incorporating a minority phase NiO in LSMO films creates ultrahigh density of vertically aligned epitaxial interfaces that strongly influence the oxygen vacancy formation and distribution in LSMO. Combined structural characterizations reveal strong interactions between NiO and LSMO across the epitaxial interfaces leading to a topotactic phase transition in LSMO accompanied by significant morphology evolution in NiO. Using the NiO nominal ratio as a single control parameter, we obtain intermediate topotactic nanostructures with distinct distribution of the transformed LSMO-BM phase, which enables systematic tuning of magnetic and electrical transport properties. The use of self-assembled heterostructure interfaces by the epitaxial nanocomposite platform enables more versatile design of topotactic phase structures and correlated functionalities that are sensitive to oxygen vacancies.

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Section: Introductionmentioning

confidence: 73%

Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces

Zhang

Cheng

et al. 2021

Nano-Micro Lett.

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“…These are quite large values. For comparison, it was shown in [39] that even at a temperature of 10 K the maximal magnetization for stoichiometric La 0.7 Sr 0.3 MnO 3 manganite films was obtained at only about 550 ± 10 emu/cm 3 . When comparing two films with different Sr content, it can be seen that at 320 K for x = 0.08, M does not saturate even at the 50 kOe magnetic field, whereas when x increases to 0.3, the M−H loops were saturated already at 10 kOe with M = 870 ± 10 emu/cm 3 at room temperature.…”

Section: Magnetoresistance Of Nanostructured Lsmo Filmsmentioning

confidence: 99%

Enhancement of Room-Temperature Low-Field Magnetoresistance in Nanostructured Lanthanum Manganite Films for Magnetic Sensor Applications

Žurauskienė

Stankevič

Kersulis

et al. 2022

Sensors

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The results of colossal magnetoresistance (CMR) properties of La1-xSrxMnyO3 (LSMO) films grown by the pulsed injection MOCVD technique onto an Al2O3 substrate are presented. The grown films with different Sr (0.05 ≤ x ≤ 0.3) and Mn excess (y > 1) concentrations were nanostructured with vertically aligned column-shaped crystallites spread perpendicular to the film plane. It was found that microstructure, resistivity, and magnetoresistive properties of the films strongly depend on the strontium and manganese concentration. All films (including low Sr content) exhibit a metal–insulator transition typical for manganites at a certain temperature, Tm. The Tm vs. Sr content dependence for films with a constant Mn amount has maxima that shift to lower Sr values with the increase in Mn excess in the films. Moreover, the higher the Mn excess concentration in the films, the higher the Tm value obtained. The highest Tm values (270 K) were observed for nanostructured LSMO films with x = 0.17–0.18 and y = 1.15, while the highest low-field magnetoresistance (0.8% at 50 mT) at room temperature (290 K) was achieved for x = 0.3 and y = 1.15. The obtained low-field MR values were relatively high in comparison to those published in the literature results for lanthanum manganite films prepared without additional insulating oxide phases. It can be caused by high Curie temperature (383 K), high saturation magnetization at room temperature (870 emu/cm3), and relatively thin grain boundaries. The obtained results allow to fabricate CMR sensors for low magnetic field measurement at room temperature.

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“…7,8 Among all perovskite manganites, La 0.67 Sr 0.33 MnO 3 (LSMO) has been the most widely investigated in system due to its intrinsic MR characteristics, high T C (~ 369 K) and tunable T MI . Enhanced LFMR effect has been obtained in magnitudes and different temperature ranges in LSMO-based VAN thin films, such as LSMO:ZnO, [9][10][11][12] LSMO:CeO 2 , [13][14][15] and LSMO:NiO, 16,17 and LSMO:CuO. 18 For example, a LFMR value of 41% at 10 K was obtained in the LSMO:NiO films.…”

Section: Tuning Lfmr Effect In Self-assembled Van Filmsmentioning

confidence: 99%

“…The LFMR value of 18.7% at 300 K has been observed in the VAN LSMO:NiO films, which is attributed to the fine microstructure, in which the unit structure period width defined as the two neighboring LSMO and NiO columns is only about 2.2 nm. 17 Sun et al constructed a nanodumbbell structure in the VAN LSMO:CeO 2 films by sequentially building composite bilayers with different two-phase volume ratios. The tilted LSMO/ CeO 2 interfaces exhibit distinct domain mismatch patterns that are different from the vertical phase boundaries and thus present highly efficient strain tuning and highly improved magnetic and transport performances.…”

Section: Tuning Lfmr Effect In Self-assembled Van Filmsmentioning

confidence: 99%

Approaches to enhance low-field magnetoresistance effect at room temperature of self-assembled manganite nanocomposite films via microstructure design

Wang

2021

MRS Bulletin

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The low-field magnetoresistance (LFMR) effect of perovskite manganite nanocomposite films can be enhanced by controlling the microstructure. However, improving the LFMR effect at room temperature is still a challenge. Therefore, it is necessary to design unique nanostructures for manganite nanocomposite films and accurately control the composition, morphology, size, and geometric distribution of the second phase. In this article, we first summarize the research progress of the LFMR effect in the perovskite manganite composite films and then discuss the main factors affecting the LFMR effect. Finally, new approaches to enhance the LFMR effect at room temperature of self-assembled manganite nanocomposite films via nanostructure design are discussed.

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Room temperature magnetoresistance properties in self-assembled epitaxial La_0.7Sr_0.3MnO₃:NiO nanocomposite thin films

Cited by 9 publications

References 29 publications

Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces

Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces

Enhancement of Room-Temperature Low-Field Magnetoresistance in Nanostructured Lanthanum Manganite Films for Magnetic Sensor Applications

Approaches to enhance low-field magnetoresistance effect at room temperature of self-assembled manganite nanocomposite films via microstructure design

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