Superconducting Magnet Construction A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire has no electrical resistance and therefore can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce greater magnetic [...]
How does Magnetism Affect a Watch? Watches can be adversely affected by magnetism and may gain or lose time. It is important not to leave a watch close to magnetic objects for a long periods. In particular, cell phones, television and PC speakers, magnetic necklaces, handbag clasps, hair-driers, electric razors, magnetic parts of refrigerators are [...]
Watch Movement Rotor Magnet Different historical periods have their timer utility. The earliest astronomy timing was taken advantage of the sun or the moon to time, and then fluid is also utilized to time. As a modern invention, quartz watch has many merits, include the simple structure, easy to assemble, strong endurance, shockproof, accurate timepieces, [...]
Magnetization Dynamics 1 Introduction Magnetization dynamics, where one investigates the time-dependent motion of the magnetization rather than its equilibrium behavior, are fundamental to the properties of magnetic materials. It is worthwhile remembering that the concept of spin waves was introduced by Bloch in 1930 in order to calculate the magnetic contribution to the specific heat [...]
The Basics of Magnetism To understand what makes a material magnetic, you have to think small. Really small. Like atom small. Atoms are the basic building blocks that come together to form molecules, which come together for form, well, just about everything around you! Inside every atom there are protons, neutrons, and electrons. Protons have [...]
MPCO Can Test the Angular Direction (ϕ, θ) of Magnetization! How well do you need to know your magnets? Using our m-axis testing equipment, magnetic moment, remanence and magnetization direction of magnetic dipoles can be characterized with high precision. The calculation is based on determination of the dipole using an integrated AMR sensor set-up. The [...]
Magnetic Applications Package Closure Magnets Design Considerations In addition to your physical and design aesthetic requirements, we'll want to know the closure retention force in order to determine whether two magnets or one magnet with a steel disc or strike plate should be used. Air Gap (the space between the magnets or steel receptive piece) [...]
Hall Effect Sensor Magnets Let MPCO help choose the magnet to best suit your specific sensor application requirements. We have experience designing around the effect of environmental conditions, temperature, shock, vibration, corrosion resistance, magnetic stability, manufacturability, form factor (and more!) related to the use of magnets with sensors and can help optimize the performance of [...]
Alnico vs Ceramic Magnets – How Do They Affect Guitar Pickup Tone? Taking a close look at the differences between alnico and ceramic magnets and their effect on tone. When choosing a new pickup for your guitar, consider the magnet, one of the essential, yet complicating elements involved in the sound creation process. We’ll try [...]
Breakthrough in Sustainable Permanent Magnet! As we all know, most permanent magnets are made of rare-earth metal alloys, but the mining and processing of these materials can produce toxic by-products, leading to ecological damage around rare earth mines and refineries. Now, a group of scientists led by the University of Leeds has made breakthrough progress [...]
Select Material Grades for Neodymium Magnets When you are trying to figure out which neodymium magnets to select for your design needs, you would always see the term “grade” or “N rating” from any supplier or manufacturer. Besides a few other criteria, desired material grade must be defined for a neodymium magnet. So, what does [...]
B-H Curve for Permanent Magnets What is a B-H curve first of all? B is the nomenclature for magnetic flux density (induction) and H is magnetic field strength; a B-H curve plots out the relationship between them for a particular ferromagnetic material. The changes in magnetic flux density is dependent on the magnetic field strength. [...]