Nuclear Magnetic Resonance in NiF2 Domain Walls

摘要

Two additional nuclear resonances of the F19 nuclei are observed in the antiferromagnetic state of NiF2. These resonances can be observed in zero magnetic field at ν = 26.6 Mc/sec and ν = -51.2 Mc/sec. They are broad, asymmetric, and easily saturated, with an apparent value of T1∼8 sec, at 20.30°K. They correspond to internal fields along [110] and [1¯1¯0] directions respectively for H0 along [110]. These compare quite well with the theoretical values of +18.7 Mc/sec and -54.4 Mc/sec calculated from the measured interaction parameters for a spin alignment along [110] and [1¯1¯0]. These two resonances arise from F19 nuclei in the domain walls.