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Zimanyi, Gergely
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article
On the limits of coercivity in permanent magnets
Abstract
<p>The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm<sub>1-</sub><sub>z</sub>Zr<sub>z</sub>(Fe<sub>1-</sub><sub>y</sub>Co<sub>y</sub>)<sub>12-</sub><sub>x</sub>Ti<sub>x</sub> based alloys, which are considered an alternative to Nd<sub>2</sub>Fe<sub>14</sub>B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations.</p>