Magnets are natural magnetite. It is a rock mineral and one of the main iron ores, with the chemical formula. The ancient Greek and Chinese found a kind of naturally magnetized stone in nature, called it “magnetite.” this kind of stone can pick up small pieces of iron and point in the same direction after randomly swinging.
Early sailors used magnets as a compass to distinguish directions at sea.and then the Chinese discovered and used magnets make out compasses. China’s four major inventions “compasses” is contact magnet.
After thousands of years of development, magnets become a powerful material in our lives. By synthesizing alloys of different materials, the new material comes out,and the magnetic strength is improved.
Then,The ferrite magnet was produced in the 1950s,and rare earth magnets including neodymium iron boron (NdfeB) and samarium cobalt(SmCo) were produced in the 1970s. after that, the technical of magnet developed rapidly, and the strong magnetic material makes smaller.
Magnet uses widely in our lives, some people will worry affect our bodies.
Actually, The earth itself is a strong magnetic field, people will adaptation or even dependence on magnetism. The weaker and stable magnetic field is good for the body, so magnetic therapy will be used on medicine. that means magnet is not harming our body.
Some people will like to wear a magnet bracelet. the magnet bracelet continuously stimulates the wrist microcirculation system through weak magnetic lines of force.it has very weak effects on promoting blood circulation, improving the physiological magnetic field of the human body, and eliminating fatigue, it does have some benefits for sleep.but some will worried if wearing long time bracelet will harm for body.the bracelet content magnet is limited. the gauss less than 3T, It is impossible to cause a bad impact on the body.
Then neodymium magnet also belongs to natural magnetic stone, it does no harm for your body.
