Abstract
The magnetocrystalline anisotropy of CoS2 has been measured by torque method using a single crystal and the anisotropy constants determined as K1<0 and K2\simeq0, with the easy axis of [111]. The temperature dependence of K1 is found to be proportional to the 20-th power of the thermomagnetic curve. The Co59 NMR has been studied by both CW and transient techniques in the temperature range of 4.2–77 K. The NMR spectrum is broadened by an anisotropic hyperfine interaction, and the isotropic and axial components of the hyperfine field are determined to be −59.43 kOe and −5.42 kOe at 4.2 K. The overall resonance spectrum is explained qualitatively from the domain structure with the shape anisotropy. Some discussion of the electronic origin of the magnetic anisotropy is given.
