Hysteresis loop

The magnetic properties of core/shell nanoparticles (NPs) depend on the various parameters, including the magnetic interactions, but these effects have not been well studied. Here, we systematically investigated the structure and magnetic properties of Fe3O4@CoFe2O4 core/shell NPs. X-ray diffraction (XRD), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) confirmed the formation of Fe3O4@CoFe2O4 core/shell NPs.

6p visergeyne 18-06-2024 0 0   Download

"Standard Test Method for Direct Current Magnetic Properties of Soft Magnetic Materials Using D-C Permeameters and the Point by Point (Ballistic) Test Methods" provides dc permeameter tests for the basic magnetic properties of soft magnetic materials in the form of bars, rods, wire, or strip specimens which may be cut, machined, or ground from cast, compacted, sintered, forged, extruded, rolled, or other fabricated materials.

11p hth_hn_vn 10-12-2023 9 4   Download

This test method provides dc hysteresigraph procedures (B-H loop methods) for the determination of basic magnetic properties of materials in the form of ring, spirally wound toroidal, link, double-lapped Epstein cores, or other standard shapes that may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for normal induction and hysteresis loop determination taken under conditions of continuous sweep magnetization. Rate of sweep may be varied, either manually or automatically at different portions of the curves during measurement.

12p hth_hn_vn 10-12-2023 7 3   Download

The most distinctive property of ferromagnetism is the observation of hysteresis loops. It is the feature showing the fact that ferromagnetism can remain as a nonzero magnetization after applying an external field and then removing it. This paper aims to introduce one method of using finite element methodology to calculate demagnetization energy, hence to obtain the optimal configuration of magnetic material.

5p vilexus 05-10-2022 16 3   Download

Bi1-xEuxFeO3 (BEFO) (x = 0.00 ÷ 0.10) materials were prepared by sol-gel method. The crystal structural, Raman scattering, magnetic and optical properties of BEFO were investigated by X-ray diffraction (XRD), Raman scattering spectroscopy, magnetic hysteresis (M-H) loops and fluorescence spectroscopy (FL), respectively.

7p vimelindagates 18-07-2022 11 3   Download

The study of microstructure shows no obvious change of grain size and shape. The magnetic properties of the as-prepared samples show the linear magnetic field dependence of magnetization, suggesting the antiferromagnetic feature of polycrystalline ceramics. The field dependence of magnetization measured after two-years synthesis and after applying an electric field reveal a decrease of maximum magnetization but the hysteresis loops retain the antiferromagnetic behavior.

10p nguyenxuankha_bevandan 14-08-2020 18 2   Download

Pure BiFeO3 (BFO) and Bi1-xHoxFe0.97Ni0.03O3 (x = 0, 0.025, 0.05, 0.075, and 0.1) materials were synthesized by a sol-gel method. The influence of (Ho, Ni) co-doping on structural, magnetic and electrical properties of BFO materials were investigated by different techniques as X-ray diffraction (XRD), energy dispersion X-ray (EDX), Raman scattering, magnetic hysteresis (M-H) loops, and complex impedance spectra measurement. XRD results showed that all samples were crystallized in the rhombohedral structure with R3C space group.

9p nguyenminhlong19 22-04-2020 17 0   Download

The magnetic properties and domain structure of (CoFeB/Pd)n (n = 2  10) multilayers prepared by DC magnetron sputtering with perpendicular magnetic anisotropy have been investigated systematically. The study has been carried out by using vibration sample magnetometer (VSM) and magneto-optical Kerr effect (MOKE) microscope. The results show clear changes of magnetic hysteresis and domain structure when increasing the number of bilayer (n) from 2 to 10.

8p chauchaungayxua2 07-01-2020 20 1   Download

This work pointed out the preparation of a magnetic glass–ceramic in the system Fe2O3–ZnO–CaO–SiO2. The base composition was designed to crystallize about 60% magnetite. The influence of adding TiO2, Na2O and P2O5 separately or as mixtures was studied. The DTA of the glasses revealed a decrease in the thermal effects by adding P2O5, TiO2 and Na2O in an increasing order. The X-ray diffraction patterns showed the presence of nanometric magnetite crystals in a glassy matrix after cooling from the melting temperature.

9p kethamoi1 17-11-2019 23 0   Download

This paper introduces a control structure based on the classical PID controller in order to monitor the IGBT switching frequency while still guaranteeing the qualities of SAPF. There are two controlled loops needed for the system.

10p visumika2711 17-07-2019 14 0   Download

LaFeO3 system with doped Ti, Co, Cu was manufactured by solid state reaction method, it was sintered at 12500C and 12900C in 10 hours with a heating rate of 3 0C/min. Using X-ray diffraction and Scanning Electron Microscope (SEM) to examine the structure, it reveals that samples are single-phase and orthogonal-perovskite structure describing by the Pnma space group, the unit cell volume of the samples increases when Ti, Co, Cu are doped to replace ion Fe+3.

8p vi4mua 01-03-2019 21 2   Download

The results also showed that the formation of cobalt ferrite spinel structures is affected by synthesis methods. Both prepared techniques were effective for the production of spinel crystalline nanoparticles. Magnetic hysteresis loop data confirmed that the magnetic properties of nanoparticles depend on the structure and size of particles.

8p tonymina21 05-12-2018 26 2   Download

This paper presents an energy-based low-cycle fatigue criterion that can be used in analyzing and designing structures made from shape memory alloys (SMAs) subjected to cyclic loading. Experimentally, a response similar to plastic shakedown is observed: during the first cycles the stress-strain curve shows a hysteresis loop which evolves during the first few cycles before stabilizing.

20p thienthanquydu 23-10-2018 18 0   Download

Magnetic measurements indicate a dependence of the squareness and the coercivity of the magnetization hysteresis loop on pH values with a maximum coercivity of 1425 Oe. The morphological properties of CoNiP nanowires were studied by transmission electron microscopy (TEM). The chemical composition was determined by examination of the energy dispersive X-ray (EDS) spectra and the magnetic properties were measured by vibrating sample magnetometry (VSM).

5p thuyliebe 09-10-2018 23 0   Download

Previous studies have suggested that positive feedback loops and ultrasensi-tivity are prerequisites for bistability in covalent modification cascades. However, it was recently shown that bistability and hysteresis can also arise solely from multisite phosphorylation.

12p inspiron33 25-03-2013 32 2   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hysteresis loops of individual Co nanostripes measured by magnetic force microscopy

6p sting04 08-02-2012 54 12   Download