Fig. 2: Temperature dependence of coercivity.

The blue line μ₀H₀ and the red line μ₀H_c were calculated from Fig. 1b for 21.1 nm × 21.1 nm × 21.9 nm (713,172 spins) isolated grain at each temperature. The colored area depicts the coercivity μ₀H_c under the demagnetization fields in the range of demagnetization factor N_d = 0.5–1.0. The green and purple squared lines denote the experimental measurements in sintered²⁹ and the hot-deformed with grain boundary diffusion of Nd-Cu alloy¹⁴ magnets, respectively. Inset shows α = H₀/H_k and \({\alpha }^{\prime}={H}_{\mathrm{c}}/{H}_{\mathrm{k}}\).