Anisotropic electrical and magnetic properties in grain-oriented Bi4Ti3O12–La0.5Sr0.5MnO3

2018 ◽  
Vol 6 (42) ◽  
pp. 11272-11279 ◽  
Author(s):  
Wei Zou ◽  
Jianlin Wang ◽  
Zezhi Chen ◽  
Nai Shi ◽  
Zhiang Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Aspect Ratio ◽  
Magnetic Anisotropy ◽  
High Aspect Ratio ◽  
Spin Valves ◽  
Electrical And Magnetic Properties ◽  
Potential Applications

A high aspect ratio nanoplate and extremely high grain-oriented ceramics with large electrical and magnetic anisotropy in novel semiconducting Aurivillius ferroelectrics are obtained, which have potential applications in selective photocatalysis and charge-spin valves.

Antiferromagnetic FeMn alloys electrodeposited from chloride-based electrolytes

2016 ◽  
Vol 18 (11) ◽  
pp. 8212-8218 ◽  
Author(s):  
Sandra Ruiz-Gómez ◽  
Rocío Ranchal ◽  
Manuel Abuín ◽  
Ana María Aragón ◽  
Víctor Velasco ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Metal Alloys ◽  
Spin Valves ◽  
Magnetic Composites ◽  
Magnetic Devices

The capability of synthesizing Fe-based antiferromagnetic metal alloys would fuel the use of electrodeposition in the design of new magnetic devices such as high-aspect-ratio spin valves or new nanostructured hard magnetic composites.

A New Negative-Tone, UV Lithography Photoresist for Fabrication of Ultra-High-Aspect-Ratio Microstructures

2006 ◽  
Author(s):  
Ren Yang ◽  
Steven Soper ◽  
Wanjun Wang
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Sulfonium Salt ◽  
Ultraviolet Lithography ◽  
Uv Lithography ◽  
Aspect Ratios ◽  
Potential Applications ◽  
New Type ◽  
Preliminary Study ◽  
Negative Tone

We report a new type of negative-tone photoresist in this paper. The resist is based on the composite of EPON resins 154 165 (both from Hexion Specialty Chemicals, Inc., Columbus, OH 43215). These two epoxy resins were mixed in an optimal ratio and dissolved into the gamma-butyrolactone (GBL) solvent. The mixture was then photosensitized by adding a given amount of triaryl sulfonium salt to obtain the new negative tone photoresist that can be used in for ultra high aspect ratio microstructures with UV lithography. The preliminary study has found that microstructures with height of more than 1000 μm and feature sizes of 10 μm (aspect-ratios of more than 100) can be obtained using the new resist film with ultraviolet lithography. The microstructures have excellent sidewall quality. In this paper, both the material properties and lithography properties of this new type of UV resist will be presented. The potential applications of the new resist in microfabrication and MEMS systems are also discussed.

Facile controlled synthesis and magnetic properties of high-aspect-ratio nickel nanowires prepared by the dropping method

2017 ◽  
Vol 693 ◽  
pp. 257-263 ◽  
Author(s):  
Wenfeng Xiang ◽  
Jiaqi Zhang ◽  
Yuan Liu ◽  
Minghao Hu ◽  
Kun Zhao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Controlled Synthesis ◽  
Nickel Nanowires

FORMATION OF ZnO NANOBRUSHES IN DIRECT ATMOSPHERE USING A CARBON CATALYST AND A Zn METAL SOURCE

NANO ◽  
2008 ◽  
Vol 03 (05) ◽  
pp. 361-365 ◽  
Author(s):  
SHUBRA SINGH ◽  
S. BHASKAR REDDY ◽  
M. KOTTAISAMY ◽  
M. S. RAMACHANDRA RAO
Keyword(s):  
Aspect Ratio ◽  
Piezoelectric Property ◽  
High Aspect Ratio ◽  
Activated Charcoal ◽  
Quartz Substrate ◽  
Source Material ◽  
Carbon Catalyst ◽  
Metal Source ◽  
Evaporation Method ◽  
Potential Applications

In this paper we report on the preparation of nanobrushes of ZnO on quartz substrate by a direct atmosphere evaporation method using Zn metal flakes. Activated charcoal was used as a catalyst that facilitated the formation of nanobrushes in which the brush stem was about 15–20 μm in length and the bristles (100–200 nm thick) were made up of nanofibrous ZnO whose tips were 10–15 nm in width and were angled in some cases. These aligned nanobrushes can find potential applications as nanopower generators and high aspect ratio AFM probes by virtue of the piezoelectric property of ZnO . This technique is simple for realizing aligned ZnO nanobrushes with metallic Zn as the source material.

Electrical and magnetic properties of nano-oxide added spin valves

2006 ◽  
Vol 505 (1-2) ◽  
pp. 22-28 ◽  
Author(s):  
Kebin Li ◽  
Yihong Wu ◽  
Guchang Han ◽  
Jinjun Qiu ◽  
Yuankai Zheng ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin Valves ◽  
Electrical And Magnetic Properties ◽  
Nano Oxide

scholarly journals Fabrication of High-Aspect-Ratio Cylindrical Micro-Structures Based on Electroactive Ionogel/Gold Nanocomposite

Applied Nano ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 59-69
Author(s):  
Edoardo Milana ◽  
Tommaso Santaniello ◽  
Paolo Azzini ◽  
Lorenzo Migliorini ◽  
Paolo Milani
Keyword(s):  
Aspect Ratio ◽  
Electric Fields ◽  
High Aspect Ratio ◽  
Polymer Nanocomposite ◽  
Potential Applications ◽  
Nanostructured Gold ◽  
Gold Nanocomposites ◽  
Micro Structures ◽  
Cluster Beam Deposition ◽  
Beam Deposition

We present a fabrication process to realize 3D high-aspect-ratio cylindrical micro-structures of soft ionogel/gold nanocomposites by combining replica molding and Supersonic Cluster Beam Deposition (SCBD). Cylinders’ metallic masters (0.5 mm in diameter) are used to fabricate polydimethylsiloxane (PDMS) molds, where the ionogel is casted and UV cured. The replicated ionogel cylinders (aspect ratio > 20) are subsequently metallized through SCBD to integrate nanostructured gold electrodes (150 nm thick) into the polymer. Nanocomposite thin films are characterized in terms of electrochemical properties, exhibiting large double layer capacitance (24 μF/cm2) and suitable ionic conductivity (0.05 mS/cm) for charge transport across the network. Preliminary actuation tests show that the nanocomposite is able to respond to low intensity electric fields (applied voltage from 2.5 V to 5 V), with potential applications for the development of artificial smart micro-structures with motility behavior inspired by that of natural ciliate systems.

Fabrication of High-Aspect-Ratio Structural Change Microregions in Silicon Carbide by Femtosecond Bessel Beams

2015 ◽  
Vol 1102 ◽  
pp. 143-147
Author(s):  
Liang Liang Zhao ◽  
Feng Wang ◽  
Jun Xie ◽  
Wei Wei Zhao
Keyword(s):  
Silicon Carbide ◽  
Structural Change ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Propagation Distance ◽  
Bessel Beams ◽  
Convex Lens ◽  
Potential Applications ◽  
Optimized Conditions ◽  
Induced Structure

This letter presents the morphology of femtosecond Bessel beams induced high-aspect-ratio structural change regions in bulk silicon carbide. An axion is engaged in transforming Gaussians beams to Bessel beams, which are then focused on the surface or below the surface of the sample by combination of a plano-convex lens and a microscope objective. The sample is scanned by the focused femtosecond Bessel beams at the preset patterns. Through this method, the high-aspect-ratio uniform laser induced structure change regions have been produced and the highest respect ratio can reach 206 with the depth of 330 μm, the width of 1.6 μm in optimized conditions of appropriate focusing position and pulse energy. This result is attributed to uniform energy distribution in the long propagation distance of Bessel beams with nondiffracting. This technique will have great potential applications to make high-aspect-ratio microgrooves in wide-gap and transparent materials.

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

2015 ◽  
Vol 241 ◽  
pp. 69-92 ◽  
Author(s):  
M. Raghasudha ◽  
D. Ravinder ◽  
P. Veerasomaiah
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Dielectric Loss ◽  
Loss Tangent ◽  
High Frequency ◽  
Room Temperature ◽  
Hysteresis Loops ◽  
Dielectric Measurements ◽  
Electrical And Magnetic Properties ◽  
Potential Applications

The work deals with the study of electrical and magnetic properties of Magnesium-Chromium and Cobalt-Chromium nanoFerrites for their potential applications synthesized by Citrate-Gel auto-combustion method. Structural Characterization of prepared nanoferrites was performed using XRD, SEM, EDS and TEM. XRD patterns confirmed the formation of homogeneous single phased cubic spinel belonging to the space group Fd3m (in agreement with ICSD Ref. data). It is found that crystallite size of Mg-Cr ferrites was in the range of 7-23nm and that of Co-Cr nanoferrites in the range of 6-12 nm. Structural morphology of both the ferrites was studied by SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy). Elemental compositional analysis was carried out by EDS.Electrical properties such as D.C. resistivity of prepared Mg-Cr and Co-Cr nanoferrites were studied by two probe method. The dielectric measurements as a function of frequency at room temperature were performed in the frequency range of 20Hz to 2MHz using LCR meter. Various dielectric parameters like dielectric constant (ε′), dielectric loss (ε′′) and dielectric loss tangent (tan δ) were measured as a function of frequency. The magnetization measurements of the prepared nanoferrite samples were carried out at room temperature in the applied field of ±15KOe using Vibrating Sample Magnetometer (VSM). From the obtained M-H loops, various magnetic parameters such as Saturation Magnetization (Ms), Coercivity (Hc) and Remanence Magnetization (Mr) were measured. Magnetization as a function of field (±10T) at 5K, 25K, 300K temperatures was measured using VSM. Super-paramagnetic nature of some specified samples in Mg-Cr nanoferrites system was investigated from the temperature dependence of both the field cooled (FC) and the zero-field cooled (ZFC) magnetization measurements under a field of 100 Oe in the temperature range 5K to 350K.From the results of D.C. resistivity measurements it is observed that the resistivity decreases with increase in temperature for both Mg-Cr and Co-Cr nanoferrites suggesting the semiconducting behavior of the samples. Dielectric measurements suggest that the conduction in the ferrite systems may be due to the polaron hopping mechanism. The low loss tangent values at high frequency show the potential applications of these materials in high frequency microwave devices. Mg-Cr nanoferrites were synthesized yielding narrow hysteresis loops which are the characteristic of very soft magnetic materials that are desirable for their utility in Transformers, Inductor cores, Microwave devices and Magnetic shielding. Hysteresis loops of Co-Cr nanoferrites show the medium hard magnetic behavior of the materials. MgFe2O4 shows superparamagnetic behavior above room temperature and MgCr0.9Fe1.1O4 shows superparamagnetic behavior with the blocking temperature 94.5K. Hence these nanoferrites find applications in targeted drug delivery and in Magnetic Resonance Imaging (MRI) in biomedical field. The observed results can be explained in detail on the basis of composition and crystallite size.Contents of Paper

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