Rare Earth Magnets
Rare Earth Magnets - Related Videos
09:28
Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles
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Cited by 5 •
2018
Antigen-specific T cells are difficult to characterize or utilize in therapies due to their extremely low frequency. Herein, we provide a protocol to develop a magnetic particle which can bind to antigen-specific T cells to enrich these cells and then to expand them several hundred-fold for both characterization and therapy.
10:04
Magnetic Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar magnets can also generate magnetic fields due to microscopic dynamics of charges inside the material. Magnetic fields will exert magnetic force on other moving...
02:37
Conditions on Early Earth
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2020
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.In the 1920s, the scientists Oparin and Haldane proposed the idea that simple biological...
02:37
Conditions on Early Earth
0 Views •
2026
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.In the 1920s, the scientists Oparin and Haldane proposed the idea that simple biological...
09:25
Detection and Enrichment of Rare Antigen-specific B Cells for Analysis of Phenotype and Function
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Cited by 36 •
2017
A simple yet effective method that employs magnetic nanoparticles to detect and enrich antigen-reactive B cells for functional and phenotypic analysis is described.
FAQs
Unpaired electron spins generate individual magnetic moments within the alloy. When the material’s crystal structure and processing favor magnetic anisotropy, these moments and magnetic domains align preferentially rather than pointing randomly. This alignment produces high remanence, meaning the material retains substantial magnetization after an external field is removed, helping create strong fields from relatively small volumes.
Crystal structure establishes preferred directions for magnetization, while processing helps promote alignment of magnetic domains with those directions. Together, they make the magnet less likely to lose its organized magnetic state when exposed to opposing influences. This resistance to demagnetization is essential when a component must retain its magnetic performance during operation.
Neodymium-iron-boron and samarium-cobalt compositions both combine strong magnetization with compact size, but they offer different balances of temperature stability and corrosion resistance. Selecting between them therefore depends on the surrounding operating conditions and the required durability. The composition is not chosen only for field strength, because environmental and thermal behavior also affect suitability.
Temperature and corrosion are important reliability concerns. Temperature control helps preserve the intended magnetic behavior, while protective coatings can help shield the material from corrosive conditions. These measures become part of the design when a magnet must operate consistently over time, particularly in compact systems where materials are closely integrated with other components.
Their strong magnetic fields from relatively small volumes allow designers to incorporate substantial magnetic performance without requiring large magnet assemblies. In electric motors and generators, this supports compact device designs while maintaining the magnetic interaction needed for operation. The same combination of high magnetization and small size explains their value in engineering systems where space is limited.
These applications use the magnets’ persistent magnetic fields in different device roles. Loudspeakers, sensors, and magnetic couplings each depend on controlled magnetic interactions, but the surrounding design determines how the field contributes to sound production, detection, or transmission across a coupling. Their common advantage is a stable, strong field available from a compact component.
Data-storage applications require attention to the magnet’s retained magnetic state and resistance to demagnetization, because magnetic information depends on stable organized domains. Material composition, temperature control, and protective coatings can influence reliability. Sustainability also matters during material selection and system design, since the use of rare-earth-containing alloys raises broader resource considerations alongside performance goals.