Magnetic properties of single crystal YCo5

The previous measurements of the first anisotropy constant, K1, of single crystal YCo5by Hoffer and Strnat were extended over a wider temperature range (4.2 to 900K) using their same sample. However, the measurements of magnetization parallel and perpendicular to the c-axis of the crystal were made using a vibrating sample magnetometer and values of the second anisotropy constant were also obtained. K1and K2at 296K were found to be 5.68 × 10⁷and 1.74 × 10⁷ergs/cm3respectively. The temperature dependence of K1and K2was investigated and it was found that the temperature dependence could be fitted to the theory of Carr³. The Curie temperature of YCo5was found to be 895K, in good agreement with Strnat and Hoffer, but in poor agreement with Tatsumoto et al.