Magnetic anisotropy higher field

Secondly, in both cases of the films specific angular dependence of the resonance field is observed especially for the films obtained in external MF. As one can see (Figure 4) the additional peak of EMR spectra of magnetic films form imder MF action shifts toward lower field if the measuring field is parallel to the sample plane and towards higher if the field is perpendicular. The orientation dependence of the shape of EMR line and its resonant position results from the predomination of imiaxial type of magnetic anisotropy due to the formation of motionless anisotropic linear structures. 

Now it is important to mention, that the observation of the frequency dependent out-of-phase signal in the presence of an applied static magnetic field may be an indication that the actual zero-field signal was shifted to higher temperature by the applied field and that the complex is a low temperature SMM. In order to test this principle, it is important to make measurements at lower temperatures, as well as to chemically modify the compound to enhance magnetic anisotropy and/or achieve better separation between individual molecules in an effort to decrease intermo-lecular interactions. 

Most inorganic samples can be successfully studied at moderate strengths of magnetic field (9.4 T H = 400 MHz). Higher field spectrometers may cause chemical shift anisotropy broadening with some nuclei (e.g., P). 

---