نتایج جستجو برای: Magnetic Measurements
تعداد نتایج: 683211 فیلتر نتایج به سال:
oxide nanoparticles of fe-co-ni were prepared in six different compositions by co-precipitation method. the as-synthesized nanoparticles were characterized by x-ray diffraction (xrd), field emission scanning electron microscope (fesem), fourier transform infrared (ft-ir) and vibrating sample magnetometer (vsm). it was found that the nanoparticles had mean crystalline size of 30-55 nm and spher...
در تحقیق حاضر اثر عنصر سیلیسیم بر خواص ریز ساختاری و مغناطیسی آلیاژهای نانو کریستال نیکل-آهن تولید شده به روش آلیاژسازی مکانیکی، بررسی شد. پودرهای حاصل توسط دستگاه دیفراکتومتر اشعه ایکس (xrd)، میکروسکوپ الکترونی روبشی (sem)و دستگاه مغناطیس سنج لرزشی(vsm) مورد مطالعه و بررسی قرار گرفتند. نتایج حاصل از آنالیز نگاشت و آنالیز xrd نشان می دهد پس از 24 ساعت آسیا کاری، آهن و سیلیسیم به صورت همگن در شب...
Submicron FeCo magnetic grains with different percents of cobalt were grown in the presence of magnetic field. After omitting the excess ions and oxygen, heat treatment was performed and some samples were oriented in a polymer background in the presence of a magnetic field. The results of SEM, XRD, and magnetic measurements confirm the existence of induced magnetic anisotropy. As the strength...
In this paper, two La0/8sr0/2mno3 samples, isotropic (press without magnetic field) and anisotropic (press with magnetic field) have been prepared. Then we have investigated structural, magnetic and magnetotransport properties of these samples using XRD, SEM, Ac susceptibility and magnetoresistance measurements. These studies show that a magnetic property of anisotropic sample is improved and ...
In this research, the effect of addition of silicon carbide (SiC) nanoparticles on the improvement of the structural, superconductivity, magnetic, and flux pinning properties of high-temperature superconductor Bi1.6Pb0.4Sr2Ca2Cu3O10+θ (Bi-2223) was investigated. The Bi-2223 ceramic superconductor was prepared using the sol-gel method, and silicon carbide nanoparticles were modified by Azobisiso...
in this thesis, barium ferrite nano particles were prepared by sol-gel method. their structural and magnetic properties of samples have been investigated using thermo gravimetric analysis (tg-dta), x-ray powder diffractometer (xrd), fourier transform infrared (ftir), scanning electron microscopy (sem), field emission scanning electron microscopy (fesem), ac susceptometer, vibrating sample magne...
Single phase polycrystalline Gd1-xPrxBa2Cu3O7-δ samples with x=0.05 , 0.10, and 0.15 have been prepared by standard solid state reaction technique and characterized by XRD and SEM analysis. The electrical resistivity, Hall effect and magnetoresistance measurements have been on the samples. The electrical resistivity measurements indicate a reduction of transition temperature (Tc) and an incre...
Atomic magnetometers have found widespread applications in precise measurement of the Earth’s magnetic field due to their high sensitivity. In these measurements, various methods have been utilized to compensate the Earth’s magnetic field in an unshielded environment. In this paper, we have proposed a method based on finding the minimum resonance frequency (corresponding to minimum magnetic fie...
In this research. The magnetic phase transition and anisotropic magnetoelastic effects of a polycrystalline sample of Nd14Dy2Fe78B6 were studied by susceptibility and magnetostriction measurements. The composition was prepared by casting method. SEM pictures and XRD analysis showed that it was composed of polycrystalline magnetic phases with the main phase of 2-14-1. Results of ac susceptibil...
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