The thermodynamic, magnetic, dielectric, and magnetoelectric properties of HoFe3 (BO3) 4 and Ho0.5 Nd0.5 Fe3 (BO3) 4 are investigated. Both compounds show a second order Neél transition above 30 K and a first-order spin reorientation transition below 10 K. HoFe3 (BO3) 4 develops a spontaneous electrical polarization below the Neél temperature (TN) which is diminished in external magnetic fields. No magnetic-field induced increase of the polarization could be observed in HoFe3 (BO3) 4. In contrast, the solid solution Ho0.5 Nd0.5 Fe3 (BO3) 4 exhibits both, a spontaneous polarization below TN and a positive magnetoelectric effect at higher fields that extends to high temperatures. The superposition of spontaneous polarization, induced by the internal magnetic field in the ordered state, and the magnetoelectric polarizations due to the external field results in a complex behavior of the total polarization measured as a function of temperature and field.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2009 Sep 21|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics