Bloch equations for anisotropic paramagnetic centers with spin of 1/2.

Highlights: [•] Spins are not directly observable, only the magnetic moment. [•] Magnetic moment behaves differently than spin with g-anisotropy. [•] Bloch-like equations for the magnetic moment with g anisotropy are derived. [•] The length of the magnetic moment oscillates to obey conservation of energy. [•] Relaxation of anisotropic magnetic moment has two relaxation times T 1 and T 2. [ABSTRACT FROM AUTHOR]