Block magnets are defined by three dimensions: Length, Width and Thickness. To be consistent, we define the Thickness dimension along the axis of magnetization. The thickness is usually the smallest dimension, but not always!
We’re sometimes asked if we can provide block magnets magnetized through the length or width. Yes, we do have some long “bar” magnets, where the magnetization is in the longest dimension. We are still defining this as the Thickness, though.
Magnetization direction depends on the application of a designing itself. Anisotropic neodymium magnet is the baseline for this article, and we will talk about the magnetization direction of other magnetic materials in the future, such as ceramic magnet, samarium and Alnico magnet etc.
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