Effect of heat treatment condition on magnetic, electrical transport and magnetoresistance properties of La0.67Sr0.33MnO3 manganite coatings

Yu, Zhou; Zhu, Xu-Liang; Li, Shengli

doi:10.1016/j.ceramint.2018.05.130

Cited by 12 publications

(4 citation statements)

References 62 publications

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“…The channel is seen to exhibit increasingly negative MR. For example, at B = 0.12 T, the MR before + V g is −0.65% and increases to −1.15% with 36k + V g pulses (Figure b). We note that this observation shows good agreement with the magnetic degradation in the LSMO as proposed above, which could lead to the increase in spin-disorder sites and magnetic inhomogeneities in the oxide channel . Smaller magnetic field was required to align these spin-ordered sites in the weakly localized regime upon the increase in V g pulsing.…”

Section: Resultssupporting

confidence: 87%

“…We note that this observation shows good agreement with the magnetic degradation in the LSMO as proposed above, which could lead to the increase in spindisorder sites and magnetic inhomogeneities in the oxide channel. 36 Smaller magnetic field was required to align these spin-ordered sites in the weakly localized regime upon the increase in V g pulsing. Therefore, the more negative MR is expected as in Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

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Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Wong

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Most previous attempts on achieving electric-field manipulation of ferromagnetism in complex oxides, such as La0.66Sr0.33MnO3 (LSMO), are based on electrostatically induced charge carrier changes through high-k dielectrics or ferroelectrics. Here, the use of a ferroelectric copolymer, polyvinylidene fluoride with trifluoroethylene [P(VDF-TrFE)], as a gate dielectric to successfully modulate the ferromagnetism of the LSMO thin film in a field-effect device geometry is demonstrated. Specifically, through the application of low-voltage pulse chains inadequate to switch the electric dipoles of the copolymer, enhanced tunability of the oxide magnetic response is obtained, compared to that induced by ferroelectric polarization. Such observations have been attributed to electric field-induced oxygen vacancy accumulation/depletion in the LSMO layer upon the application of pulse chains, which is supported by surface-sensitive-characterization techniques, including X-ray photoelectron spectroscopy and X-ray magnetic circular dichroism. These techniques not only unveil the electrochemical nature of the mechanism but also establish a direct correlation between the oxygen vacancies created and subsequent changes to the valence states of Mn ions in LSMO. These demonstrations based on the pulsing strategy can be a viable route equally applicable to other functional oxides for the construction of electric field-controlled magnetic devices.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Wong

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…We name it as 'degraded film' hereafter. Some authors reported the similar change of resistivity in doped manganite films after vacuum annealing and attributed it to the oxygen depletion in their samples [19][20][21]. According to the resistance value (not shown here), the Joule heating power at I = 33 mA can be estimated to be around 2 W. Considering that such a high bias current I b must result in large Joule self-heating, we speculate that the huge change in the ρ-T curve might be also due to oxygen depletion in the LBMO films.…”

Section: Resultsmentioning

confidence: 82%

“…As for the large-bandwidth manganites without phase separation tendency, such as Sr-and Ba-doped manganites, few results about ER have been reported in previous research. In this work, we prepare oxygen-deficient La 0.8 Ba 0.2 MnO 3−δ (LBMO) films through the Joule self-heating effect by applying a large electric current (33 mA) in vacuum instead of using the traditional vacuum annealing technique [19][20][21], and then gradually restore oxygen content in the films by heating them in air at different temperatures. In this way, we have investigated the oxygen deficiency dependent ER ratio of our samples.…”

Section: Introductionmentioning

confidence: 99%

Electroresistance effect in oxygen-deficient La_0.8Ba_0.2MnO_3−δ thin films

Lin

Wang

Cai

et al. 2020

J. Phys.: Condens. Matter

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Electroresistance (ER) has been intensively studied in low-and intermediate-bandwidth manganites, which possess phase separation characteristics. As for the Sr-and Ba-doped large-bandwidth manganites, however, few results about ER have been reported so far. Here we report ER effect in oxygen-deficient La 0.8 Ba 0.2 MnO 3−δ thin films, which were obtained by applying a large electric current (33 mA) to the pristine films in vacuum. While the pristine film displays a negligible change in resistivity with respect to the test current, the oxygen-deficient film shows significant ER effect, i.e. ER ratio of −22% at 260 K under a test current of 0.3 mA. By gradually restoring oxygen content in the films, it is found that the ER effect is closely related to the residual resistivity at low temperatures, demonstrating the key role of grain boundaries. Furthermore, the residual resistivity can readily be tuned by heating the oxygen-deficient films in air, suggesting strong oxygen activity in the grain boundaries. The magnetoresistance (MR) data show current dependent feature, also revealing the role of grain boundaries. At 40 K, the MR ratio of the 100 • C restored film under 30 kOe increases from −15% to −25% when decreasing the test current from 1 to 10 −3 mA. The large ER effect in the oxygen-deficient films is discussed based upon the conductive filament picture in grain boundaries. Our approach to controlling the ER effect through oxygen deficiency makes oxide films more promising for potential applications in the memristive devices and neuomorphic computing.

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A comparative study of the structural, magnetic transport and electrochemical properties of La0.7Sr0.3MnO3 synthesized by different chemical routes

Navin

Kurchania

2020

Appl. Phys. A

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Effect of heat treatment condition on magnetic, electrical transport and magnetoresistance properties of La0.67Sr0.33MnO3 manganite coatings

Cited by 12 publications

References 62 publications

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Electroresistance effect in oxygen-deficient La_0.8Ba_0.2MnO_3−δ thin films

A comparative study of the structural, magnetic transport and electrochemical properties of La0.7Sr0.3MnO3 synthesized by different chemical routes

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Effect of heat treatment condition on magnetic, electrical transport and magnetoresistance properties of La0.67Sr0.33MnO3 manganite coatings

Cited by 12 publications

References 62 publications

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Electroresistance effect in oxygen-deficient La0.8Ba0.2MnO3−δ thin films

A comparative study of the structural, magnetic transport and electrochemical properties of La0.7Sr0.3MnO3 synthesized by different chemical routes

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Electroresistance effect in oxygen-deficient La_0.8Ba_0.2MnO_3−δ thin films