Tunable magnetization of single domain M-type barium hexagonal ferrite nano powders by Co–Ti substitution via chemical co-precipitation plus molten salts method

The rate of death relative to the size of the world’s population has remained constant, according to the world health organization (WHO). WHO targets to minimize the ratio of road death to the half by 2022. This paper discusses a way for accident detection and notification which can decrease this ratio. Piezoelectric sensors used inside a helmet to detect degree of trauma which interpret into electrical signal that used to determine if trauma is serious or not based on predetermined threshold. This trauma can be occuard due to any kind of accidents. So, this paper established a detection system to request instant help from emergency department and relatives by delivering them an SMS contains the latitude and longitude. In usual mode helmet can operate as tracking tool monitored by the relatives.

http://ijres.iaescore.com/index.php/IJRES/article/download/20341/pdf

Smart helmet using internet of things

A novel combination of structural design and sensing theory is proposed for an optical fiber magnetic field and temperature two-parameter sensor based on the Mach-Zehnder interferometer (MZI) and Faraday rotation effect. The sensor structure includes a polydimethylsiloxane (PDMS) microcavity and a small section of offset spliced fiber. Numerical analysis shows that the sensor exhibits high temperature sensitivity, which has been experimentally verified. The sensor has a temperature sensitivity of -846 pm/°C in the 20 to 35°C and a magnetic field intensity sensitivity of 190 pm/Gs in the range of 0 to 150 Gs. The temperature and magnetic field intensity responses of the sensor are linear and have been optimized for sensitivity demodulation. The sensor is well-suited for standardized monitoring of temperature and magnetic field in applications requiring accurate measurements. 

Magnetic field and temperature two-parameter sensor based on Mach-Zehnder interferometer and Faraday rotation effect

This paper presents the design, fabrication and testing of a prototype resonant magnetic field sensor utilizing piezoelectric excitation and detection with ferromagnetic film at the free end of micro-cantilever for magnetic field detection The change in the resonant frequency of the beam due to the presence of an external magnetic field is measured using a sensing piezo at the fixed end of the beam Customized process steps are followed with six masks to fabricate the micro resonant magnetic field sensor with Aluminum nitride as piezoelectric material and soft ferromagnetic material for magnetic field detection The mechanical, electrical and magnetic characterizations are carried out to evaluate the performance of the sensor Results from analytical and experimentation are in close agreement and are in the same dimensional range Dispenser printed permanent magnets are also integrated and this is the first of its kind to enhance the magnetic property in micro resonant magnetic field sensors

Magnetic Force Based Resonant Magnetic Field Sensor With Piezoelectric Readout

A simple and precise formula for magnetic forces in nonlinear piezoelectric energy harvesting

Rare earth substituted strontium hexaferrite powders were synthesised through a molten salt route at 900°C for 5 h. The influence of rare-earth magnetic ion substitution on microstructural ...

Effect of magnetic ion substitution on the structure and temperature-dependent magnetic properties of strontium hexaferrite

Hexagonal platelet barium ferrite was produced through a two-step molten salt synthesis calcined at 850 °C for 5 h with NaCl–KCl as flux, followed by calcination at 400 °C for 5 h with hexamine. Influence of NaCl–KCl and hexamine on the structural, phase composition, surface morphology, and magnetic properties of BaFe12O19 was studied by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric/differential analysis, scanning electron microscopy, and a superconducting quantum interference device. The particles exhibited M -type barium hexaferrite nanoparticles with a product yield of 97.8% with a mean crystallite size of 81 nm for NaCl–KCl and 50 nm for hexamine. The infrared spectrum showed tetrahedral and octahedral positions in the absorption bands of hexagonal ferrite. As the atomic ratio of Ba:Fe:O is found to be 1:12.3:17.6, which is close to the stoichiometric ratio of BaFe12O19, it confirms the hexagonal structure of the sample. The plates are found to agglomerate, and variation in particle size was observed using scanning electron microscopy. The samples revealed better magnetic properties with a high saturation magnetization of 165.3 emu/g, higher remanence of 58 emu/g, coercivity of 929 Oe, and a squareness ratio of 0.35. This investigation was performed to examine the microstructure and the effect of crystallinity of the submicrometer BaFe12O19 powders on magnetic properties. This study also provides a promising method and total processing parameters to synthesize hard ferrite powders with improved hard magnetic properties and fine crystallite size.

Enhancement of Saturation Magnetization and Remanence of BaFe 12 O 19 Materials Prepared by NaCl–KCl and Hexamine as Flux

M-type hexagonal ferrite powder was prepared by the molten salt flux method calcined at a relatively low temperature (850 °C) with a product yield of 99.87%. The synthesized sample was then milled for 3 h by high-energy ball milling in toluene suspension to obtain ultrafine nanoparticles. The structural, morphological, and magnetic properties of the particles were investigated to observe the effect of milling on the molten salt synthesized powder. The analyses reveal the presence of barium hexaferrite (BaFe12O19) as the main phase with less impurities. Average crystallite size, determined by X-ray diffraction (XRD), decreased from 81 ± 20 nm to 52 ± 5 nm after ball milling. The Fourier transform infrared (FTIR) spectra ensure the tetrahedral and octahedral positions in barium hexaferrite structure with an increase in the intensity of absorption bands after milling. The electron paramagnetic resonance (EPR) signal shows a broad line that demonstrates a decrease in the amplitude of the milled sample. Furthermore, remanence measured by vibrating sample magnetometer (VSM) increases from 8.5 to 25 emu/g. A 72% increase in coercivity and 84% increase in magnetic saturation is observed for the milled samples compared to that of pure BaFe12O19 (unmilled). The variations of the magnetic properties are thus attributed to the reduction in crystalline size and lattice parameters after milling.

Effect of High-Energy Ball Milling on Molten Salt Synthesized Barium Hexaferrite Powder

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Papers

Magnetic Force Based Resonant Magnetic Field Sensor With Piezoelectric Readout

Effect of magnetic ion substitution on the structure and temperature-dependent magnetic properties of strontium hexaferrite

Enhancement of Saturation Magnetization and Remanence of BaFe 12 O 19 Materials Prepared by NaCl–KCl and Hexamine as Flux

Effect of High-Energy Ball Milling on Molten Salt Synthesized Barium Hexaferrite Powder