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J. T. Elizalde Galindo, R. Sato Turtelli, R. Grössinger, J. A. Matutes Aquino:
"Annealing effect on microstructure and coercivity of YCo₅ nanoparicles obtained by mechanical milling";
Advanced Materials Research - Web, 68 (2009), S. 122 - 126.

Nanocrystalline YCo5 powders with high coercivity were prepared by mechanical milling and subsequent heat treatment at 820 °C for different annealing times, ta = 2.5, 3.0, 3.5 and 4.5 min, obtaining average crystallite sizes of  17, 19, 32 and 39 nm., respectively. The coercivity values were determined from the hysteresis loops measured at maxima fields of Hm = 5 and 20 T. The highest coercivity was obtained for the sample exhibiting  19 nm, where at room temperature and Hm = 5 T, the coercivity value is of 9.0 kOe. At 77 K and Hm = 5 T, the coercivity increase to 11.8 kOe and for Hm = 20 T, a higher value such as 13.1 kOe was found. The Ms/Mr ratio is enhanced to 0.62 indicating the occurrence of exchange interaction among nanocrystalline magnets.

http://dx.doi.org/10.4028/www.scientific.net/AMR.68.122