Nd-Fe-B magnet in motors in hybrid or electric vehicles requires Dy to increase its coercivity to maintain their magnetization in an operating temperature. However, Dy reduces magnetization in the magnet due to anti-parallel coupling of the magnetic moment between Dy and Fe. To understand the coercivity mechanism in the Nd-Fe-B magnet to satisfy both high coercivity and magnetization, we have studied microstructures and magnetic domains in the magnet.
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