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Classification of magnetic materials 1) Organic compounds: Most of them are conjugated macrocyclic organic radicals containing unpaired electrons. The first magnetic organic compound, Galvinoxyl [1], is characterized by low density, but the ground state spin S cannot be very high, otherwise it is unstable, and therefore its magnetism is weak.The first magnetic organic compound, Galvinoxy(2) Molecular polymers: mainly low dimensional polymers such as C60 derivatives. The magnetism of such compounds may be derived from Delocalized electron, and the magnetism is also weak and not stable enough. It has been confirmed that the strong magnetism of C60 reported once actually comes from Fe3C generated during the synthesis of C60 [4].(3) Complex: It is a type of compound formed by organic ligands surrounding metals. This type of material has the characteristics of both inorganic and organic materials. As long as the molecular design is reasonable, the structure and properties of magnets can be controlled by adjusting different lig: 07

2023-07

Physical significance of magnetic materials (The magnetic component ms of the spin Quantum number s is+1/2 and -1/2, marked with ↑ and ↓ respectively) pairing without producing net spin S and the corresponding magnetic moment, so it often does not show magnetism. On the contrary, when the substance is composed of molecules containing unpaired electrons, the existence of the net spin in the molecule causes the magnetism of the substance. The magnetic moment caused by the spin of each atom or the total spin of the molecule S can be μ It is regarded as a small magnet (often called magneton). Generally, for this molecular magneto subsystem, the macroscopic magnetic moment produced by a substance containing one mole of molecules is defined as the magnetization M. When there is no external magnetic field H and high temperature T, the magneton does not show macroscopic magnetism due to its disordered orientation, but the magnetization M will increase with the decrease of temperature T and the increase of magnetic field strength H. The: 07

2023-07

History of Magnetic Materials Magnetic materials have a long history. Magnets were discovered in ancient China and applied to the compass. Theoretical research on magnetism began hundreds of years ago in Europe, such as FaradayScientists. Traditional magnetic materials are alloys such as Nd2Fe14B and metal oxides such as Fe12O19. According to the characteristics of their composition based on ions or atoms, they can be called atom based magnets, which are characterized by the synthesis of inorganic magnets with Metallic bonding or ion bonds at high temperatures. With the development of high-tech, A so-called molecular based magnetic material has emerged with molecules containing organic components such as Cp * as building blocks, such as [FeCp * 2] (Cp * represents pentamethylpentylC5H5 (CH3) 5). Its characteristic is that it is synthesized under low energy consumption and low temperature conditions, easy to adjust its structure and function through molecular tailoring, and easy to be compatible with biological syst: 07

2023-07

Solutions for Magnets A wide range of standard models provide a variety of pole configurations and magnetic strength, as well as lifting electric permanent magnets that meet all standards of various materials (such as thin plates, billets, thick plates, section steels, steel coils, etc.), ensuring that the Factor of safety of the ratio of the weight of materials in the normal operating air gap to the corresponding magnetic force of the permanent magnet crane is not less than 1:3.The Electropermanent magnet system is compact in design, light in weight, powerful and reliable. The electrically controlled permanent magnet technology can ensure that only one steel plate can be lifted within the effective thickness by allowing the magnetic force to enter a certain depth; It can also adopt a unique structure designed to lift multiple steel plates at a time.1. Factor of safety: 3 times (maximum pulling force/rated suction=4.5)2. It can be used in combination with a single unit, two units, or multiple units: 06

2023-07

Scattered Ferrimagnetism In amorphous alloys with two sets of secondary networks (Dy Co, Dy Fe, etc.), the magnetic moments of each atom exhibit a certain degree of dispersion relative to a specific direction. Because the total magnetic moments on the two networks are different in size and opposite in direction, a scattered Ferrimagnetism magnetic structure is formed.The reason for the existence of the above three magnetic structures is that rare earth atoms have strong local anisotropy, while the Exchange interaction of 4f electrons between their atoms is relatively weak, so the orientation of the magnetic moment has an angular dispersion, for example, the dispersion angle of Dy's magnetic moment in DyCo3 is about 140 °. However, the Exchange interaction of Co atom is very strong, so the magnetic moment orientation of Co atom is not dispersive, and the magnetic moment of Fe atom has a very small dispersion angle, thus forming dispersive Ferrimagnetism. When forming an alloy film with atoms with zero magne: 04

2023-07

Non collinear magnetic structure Neutron diffraction is the only experimental method that can directly measure the spatial orientation of magnetic moments of various magnetic atoms in crystals. Through neutron diffraction, it was found that the magnetic structures of some rare earth elements and their alloys exhibit non collinear characteristics. Figure 2 shows the magnetic structure characteristics of some rare earth elements. Each circular orbit represents a certain crystal plane, and the arrow represents the orientation of the magnetic moment or the component on the c-axis and plane.The magnetic properties of rare earth elements are derived from 4f electrons, which are localized in the inner orbital near the atomic nucleus. Therefore, 4f electrons in atoms cannot exchange directly with 4f electrons in neighboring atoms. However, 4f electrons can polarize the wandering s electrons. This polarized s electron has an impact on the spin orientation of 4f electrons. As a result, an indirect Exchange interaction between 4: 04

2023-07

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