Anomalous positive magnetoresistance effect in La0.67Ca0.33MnO3 microbridges

Guo, Xin; Li, P.G.; Wang, X.; Fu, X.L.; Chen, L.M.; Lei, Ming; Zheng, Weitao; Tang, W.H.

doi:10.1016/j.jallcom.2009.06.086

Cited by 6 publications

(7 citation statements)

References 28 publications

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“…Electron beam lithography (EBL) is a nanofabrication technique in rapid development [32]. Guo et al [32] grew La 0.67 Ca 0.33 MnO 3 films with thickness of ~100 nm on SrTiO 3 (100) substrates by a PLD technique and fabricated La 0.67 Ca 0.33 MnO 3 microbridges with different widths (e.g., 1.5 μm, 1 μm, and 500 nm) by EBL technology.…”

Section: Synthesis Techniques For One-dimensional Perovskite Manganitmentioning

confidence: 99%

“…Guo et al [32] grew La 0.67 Ca 0.33 MnO 3 films with thickness of ~100 nm on SrTiO 3 (100) substrates by a PLD technique and fabricated La 0.67 Ca 0.33 MnO 3 microbridges with different widths (e.g., 1.5 μm, 1 μm, and 500 nm) by EBL technology. Beekman et al [33] also grew thinner La 0.7 Ca 0.3 MnO 3 films (with a thickness range of 20–70 nm) on SrTiO 3 (001) substrates by DC sputtering.…”

Section: Synthesis Techniques For One-dimensional Perovskite Manganitmentioning

confidence: 99%

“…A domain wall is supposed to form at the nanoconstriction. Recently, La 0.67 Ca 0.33 MnO 3 microbridges with different widths are also fabricated from the well epitaxial La 0.67 Ca 0.33 MnO 3 films by EBL technology [32]. An anomalous positive magnetoresistance effect was observed in these La 0.67 Ca 0.33 MnO 3 microbridges.…”

Section: Structural Characterization Of One-dimensional Perovskite Mamentioning

confidence: 99%

“…In the La 0.67 Ca 0.33 MnO 3 microbridges with different widths fabricated by EBL technology, their magnetoresistance shows an interesting behavior due to the enhanced e – e interactions in the presence of spin disorder. It can be decreased and even changed its sign in the widths of 1.5- and 1.0-μm bridges under the magnetic field of 1 T, whereas under high magnetic fields of 4 and 7 T, the e – e interactions are weakened by other interactions, and the positive magnetoresistance is masked by the negative magnetoresistance [32].

Fig.…”

Section: Fundamental Transport Properties Of One-dimensional Perovskimentioning

confidence: 99%

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One-Dimensional Perovskite Manganite Oxide Nanostructures: Recent Developments in Synthesis, Characterization, Transport Properties, and Applications

Li¹,

Liang²,

Wu³

et al. 2016

Nanoscale Res Lett

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One-dimensional nanostructures, including nanowires, nanorods, nanotubes, nanofibers, and nanobelts, have promising applications in mesoscopic physics and nanoscale devices. In contrast to other nanostructures, one-dimensional nanostructures can provide unique advantages in investigating the size and dimensionality dependence of the materials’ physical properties, such as electrical, thermal, and mechanical performances, and in constructing nanoscale electronic and optoelectronic devices. Among the one-dimensional nanostructures, one-dimensional perovskite manganite nanostructures have been received much attention due to their unusual electron transport and magnetic properties, which are indispensable for the applications in microelectronic, magnetic, and spintronic devices. In the past two decades, much effort has been made to synthesize and characterize one-dimensional perovskite manganite nanostructures in the forms of nanorods, nanowires, nanotubes, and nanobelts. Various physical and chemical deposition techniques and growth mechanisms are explored and developed to control the morphology, identical shape, uniform size, crystalline structure, defects, and homogenous stoichiometry of the one-dimensional perovskite manganite nanostructures. This article provides a comprehensive review of the state-of-the-art research activities that focus on the rational synthesis, structural characterization, fundamental properties, and unique applications of one-dimensional perovskite manganite nanostructures in nanotechnology. It begins with the rational synthesis of one-dimensional perovskite manganite nanostructures and then summarizes their structural characterizations. Fundamental physical properties of one-dimensional perovskite manganite nanostructures are also highlighted, and a range of unique applications in information storages, field-effect transistors, and spintronic devices are discussed. Finally, we conclude this review with some perspectives/outlook and future researches in these fields.

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Section: Synthesis Techniques For One-dimensional Perovskite Manganitmentioning

confidence: 99%

Section: Synthesis Techniques For One-dimensional Perovskite Manganitmentioning

confidence: 99%

Section: Structural Characterization Of One-dimensional Perovskite Mamentioning

confidence: 99%

Fig.…”

Section: Fundamental Transport Properties Of One-dimensional Perovskimentioning

confidence: 99%

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One-Dimensional Perovskite Manganite Oxide Nanostructures: Recent Developments in Synthesis, Characterization, Transport Properties, and Applications

Li¹,

Liang²,

Wu³

et al. 2016

Nanoscale Res Lett

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“…Jiang 等 [29] 研究了不同厚度 La 0.325 Pr 0.3 Ca 0.375 MnO 3 薄膜的磁性与电阻各向异性, 结果表明, 对于 30 nm 厚的薄膜, 其各向异性电阻率(anisotropic resistivity, AR) 非常大(~10 5 %); 对于120 nm 厚的薄膜, 由于应变弛豫, 它的 AR 最大值显著降低(~2×10 3 %)。Nori 等 [30] 利用脉冲激光沉积法在 Si(100)上制备了晶粒尺寸为 20~60 nm 的 La 0.7 Sr 0.3 MnO 3 薄膜, 并对其磁性能进行了表征。结果表明, 晶粒致密排列的 La 0.7 Sr 0.3 MnO 3 薄膜居里温度为 349 K, 而柱状晶粒组成的薄膜居里温度为 355 K, 这是目前已报道的沉积在 Si 衬底上 LSMO 薄膜最高的居里温度。最近, 人们对纳米结构的钙钛矿锰氧化物薄膜的电磁输运特性亦进行了研究, 如 Hirooka 等 [31] 利用原子力显微镜(AFM)辅助化学湿法刻蚀技术制备了(La,Ba)MnO 3 纳米桥结构, 发现纳米桥的磁电阻呈现 2 个数量级的变化。近年来, Guo 等 [32] 采用 EBL 技术制备了不同宽度的 (La,Ca)MnO 3 薄膜微桥结构, 电输运特性测量结果表明: 薄膜微桥宽度在 0.50 µm 以下, M-I 相变消失, 并且出现反常的正磁电阻现象。…”

Section: 钙钛矿锰氧化物薄膜材料unclassified

Advances on Low-dimensional Perovskite Manganite Nanostructures

Li¹,

Liang²,

Wu³

et al. 2015

Journal of Inorganic Materials

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In the perovskite-type manganese oxides, multi-degrees of freedom such as charge, spin, orbital and crystal lattice coexist simultaneously, and the strong completing interactions among them result in a series of novel physical phenomena such as colossal magnetoresistance effect, giant magnetic entropy effect, metal-insulator transition, electronic phase separation and charge/orbital ordering, which make them become attractive issues in condensed matter physics. Advances in integration and miniaturization of the electronic devices have resulted in their feature sizes continued to be decreased, and now the feature sizes of electronic devices based on perovskite-type manganese oxides are down-scaled into nanometered sizes. At nanoscale perovskite-type manganese oxides exhibit apparent size effects and possess the electrical and magnetic transport properties that are different from their bulk and film counterparts, which have important applications in the fields of a new generation of microelectronic devices. In recent years, many advances have been made in fabrication, microstructural characterization electrical and magnetic property measurements of the low-dimensional perovskite manganite nanostructures, and also in the

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Focused ion beam fabrication and magneto-electrical transport properties of La0.67Ca0.33MnO3 nanobridge

Dong

Wang

et al. 2014

Appl. Phys. A

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Anomalous positive magnetoresistance effect in La0.67Ca0.33MnO3 microbridges

Cited by 6 publications

References 28 publications

One-Dimensional Perovskite Manganite Oxide Nanostructures: Recent Developments in Synthesis, Characterization, Transport Properties, and Applications

One-Dimensional Perovskite Manganite Oxide Nanostructures: Recent Developments in Synthesis, Characterization, Transport Properties, and Applications

Advances on Low-dimensional Perovskite Manganite Nanostructures

Focused ion beam fabrication and magneto-electrical transport properties of La0.67Ca0.33MnO3 nanobridge

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