High-temperature magnetic properties of SmCo_6.7-xCu_0.6Ti_x magnets

Magnetic properties of SmCo_6.7-xCu_0.6Ti_x Magnets (x = 0.25 and 0.30) are studied as a function of milling time and temperature. The samples were prepared by two methods: first by arc-melting and milling, and second by mechanical alloying from powders and subsequent annealing. The X-ray diffraction analyses show that the samples consist of 1:5 and 2:17 phases. Magnetic measurements show that the coercivity for samples prepared by arc-melting and milling increases with increase in milling time and it reaches a maximum of 8.1 kOe for x = 0.30 and 5.3 kOe for x = 0.25, and then decreases for both samples. The coercivities for the sample with x = 0.30 are higher than the coercivities for the sample with x = 0.25 for all milling times. High-temperature vibrating sample magnetometer magnetic measurements show that the coercivity for all samples decreases with increasing temperature from room temperature to 600°C. The sample prepared by mechanical alloying has higher coercivity (20 kOe at room temperature) than that prepared by arc-melting and milling for all temperatures under investigation. These materials have moderate energy products (1-10 MG Oe) and can be used for high-temperature magnetic applications.