No abstract

No abstract

We report the results of magnetic resonance studies at high microwave frequencies in metallic, metamagnetic, poly crystalline MnAu2. The investigation covered microwave frequencies from 95 to 119 GHz, temperatures from 4.20 to 400 o K, and magnetic field intensities up to 50 kOe. No resonance was observed in the spiral magnetic phase at our frequencies. At fields above that necessary to induce a ferromagnetic component in the spiral-spin system, a temperatureand frequency-dependent peak was observed in the microwave power absorption, as a function of magnetic field applied in the plane of the disk-shaped sample. We have interpreted this absorption as ferromagnetic resonance in a system with large uni-axial magnetic anisotropy. Values of the Lande g-factor and uni-axial anisotropy constant at low temperatures are determined from the data, but with large experimental uncertainty due to severe magnetic hysteresis exhibited with field cycling.

No abstract

No abstract