각 영구 자석의 차이점 자석을 구입할 때 두 가지 주요 유형이 표시됩니다., rare earth or ferrite magnets. Sometimes, under the rare earth magnets, there are sub types like neodymium or samarium. Alnico is another type of magnet you might see listed. Rare earths tend to me more expensive, but why? What’s the […]